Answer - Inservice Testing Owners Group

download report

Transcript Answer - Inservice Testing Owners Group

Handheld Calibrator model PTE-1 from Heise offers practical,
state-of-the-art features specifically designed to meet modern
line-test and field calibration application requirements. This
innovative, precision instrument offers the widest selection of
interchangeable ranges anywhere. Heise® Quick SelectTM
pressure sensor modules are available from 0.125 inches
H2O through 10,000 psi in accuracies from 0.1% to 0.025%
F.S. Quick-Select interface modules for temperature
measurement with thermocouples and RTD's are also
Equipped with two top-loading sensor module bays, the
Heise Handheld Calibrator model PTE-1 will accept two
sensor modules and display the measurements from both
sensors simultaneously. All Quick Select® sensor modules
are interchangeable with any base unit and can be quickly
and easily changed without the use of tools.
The Heise Handheld Calibrator PTE-1 system capabilities
include measurement of pressure, vacuum, temperature,
voltage, current, flow volume and velocity, calculation of leak
rate and change-of-state for switch testing, including trip point
and deadband. A benchtop version (Model ST-2H) that shares
the same Quick Select® sensor modules is also available for
laboratory applications.
The Heise Handheld Calibrator model PTE-1 is manufactured
at a modern, ISO 9001 certified facility in Stratford,
Connecticut. All base units and sensor modules include NIST
traceability documentation and are backed by a
knowledgeable Customer Service support staff.
Heise Model PTE-1
Dual Display LCD Handheld Digital Calibrator
With the unique Quick Select® modular sensor system, the
PTE-1 can be easily configured to measure ranges from 0.25” H2O to 0-10,000 psi. Quick Select® interface modules
add temperature measurement with RTDs or thermocouples,
while on-board jacks provide measurement of voltage and
current (mA). Two sensor bays and a twin LCD provide
simultaneous display of any two measurements.
Application specific features support common calibration tasks
such as setting pressure switches and relief valves and
calibrating pressure transducers. With the datalogging option,
calibration results can be stored for subsequent upload to a PC.
Field tested and proven reliable, the Heise® PTE-1 is the
popular choice for portable pressure calibration around the
Standard Features
• Measures pressure and temperature (with RTD &
thermocouple interface modules)
• Measures mA and volts via on-board input jacks
• Can hold 2 sensor modules and display any 2 readings
• Measures high static D/P across two modules
• Ranges from 0-0.25" H20 to 0-10,000 psi
• Also available in compound, absolute, vacuum and differential
• Accuracies from 0.1 to 0.025% FS
• Push-button zero adjust
• Trip point/deadband calculation for pressure switch calibration
• "% accuracy" feature for transducer/transmitter calibration
Standard Features
Min/Max memory for relief valve setting and burst testing
1 programmable and 12 selectable engineering units
Pressure decay rate calculation for leak testing
Variable damping
Tare eliminates pre-existing system pressure
RS232 output
Field calibration capability
Gas flow calculation with pitot tube or annubar
Runs on 2 alkaline 9v batteries (or optional AC power
• NIST traceable certificate of calibration
Optional Features
Intrinsic safety / FM approved, Class 1, Division 1
EMI/RFI immunity per CE requirements
Data logging & upload of up to 714 data points
Enhanced LCD for low temperature operation
Enhanced sensor processing; maintains rated accuracy from
20-120° F
• AC power adaptor
Optional Accessories
Hard or soft carrying cases
Contoured protective jacket
24 volt external loop power supply
Voltage adapter to allow switch testing on live, 110 or 220 vac
• RTD probes
Product Specifications
Physical Specifications
• Dimensions
7.88 in. (L) x 4.24 in. (W) x 3.25 in. (H)
• Weight
Max. 2.2 lbs. w/2 pressure modules installed
• Case Material
High impact ABS
• Sensor Module Capacity
2 bays for Heise HQS "Quick Select®" sensor modules
• Display
2 line LCD, 0.037 in. height per line. Can display
simultaneous readings from 2 modules
• Electrical Connection
Miniature recessed banana jacks (one set of test leads
provided with each PTE-1)
Base Unit Operating
• Operating Temperature Range
Standard: 32 to 120°F
Optional: -4 to 120°F
• Storage Temperature
-4° to 158°F
• Update Rate
130 ms (nominal) with one sensor installed
• Resolution
±0.002% of span, 60,000 count (max)
• Warm-Up
5 minutes for rated accuracy
• Electrical Measurements
0-50 mA or 0-30 Vdc
• Options
Datalogging with Hi-Lo Relay Feature - Datalogging manually
or automatically stores up to 715 measured values for upload
to PC. Includes upload utility software. Hi-Lo relay feature
allows programming of setpoints for activation of alarms or
control valves. (Hi-Lo not available with FM approval.)
Enhanced LCD - For -4 to 120°F operating range
FM Approval - Class 1, Div.1, Groups A, B, C & D (Not
available with CE Mark)
CE Mark - EMI/RFI immunity rating (not available with FM
• Power Requirements
Standard: (2) 9 Vdc Alkaline Batteries (provides up to 30
hours operation per set)
Optional: 110 or 220 Vac transformer to power calibrator from
line power
• Certification
N.I.S.T. Traceable certification document provided for base
display unit and sensor modules
Pressure Sensor Module
• Pressure Types
Gauge, differential & compound
• Available Ranges
(see chart)
• Available Accuracies
±0.06 (0/1-0/200 in.H2O), ±0.07 (0/0.25-0/0.5 in. H2O) or 0.1% of
• Compensated Temperature Range
20°F to 120°F
• Temperature Effect
±.004% of Span per°F over compensated range
(from reference temperature range of 70° ±3°)
• Repeatability
±0.01% of span (range 0/1 in. H2O or higher)
±0.02% of span (ranges below 0/1 in. H2O)
• Sensitivity
±0.002% of span (typical)
• Media Compatibility
Clean, dry, non-conductive, non-corrosive gas
• Under/Overpressure Capability
-15 to 50 psi
• Maximum Static (line) Pressure
100 psi
• Process Connection
Standard: 1/8 NPT female
Optional: G 1/8 British standard
• Other Options
FM Approved (for use with FM approved base unit)
CE Mark (for use with CE Mark rated base unit)
• Pressure Types
Gauge, absolute, compound & vacuum
• Available Ranges
(see chart)
• Available Accuracies
±0.025, 0.05 or 0.1% of Span (±0.025 & 0.05% not available on
0/10,000 psi range)
• Compensated Temperature Range
20°F to 120°F
• Temperature Effect
Standard: ±.004% of Span per °F over the compensated range (from
reference temperature range of 70° ± 3°)
Optional: No additional error due to temperature over the
compensated range
• Repeatability
±0.01% of span
• Sensitivity
±0.002% of span (typical)
• Media Compatibility
0/5 psi range only: Clean,dry, non-conductive, non-corrosive gas
0/10-0/10,000 psi ranges: Any medium compatible with 316 SS
Optional: Cleaned for Oxygen Service (0/10-0/10,000 psi ranges
• Overpressure Capability
200% for ranges up to 1000 psi
150% for ranges over 1000 psi
• Process Connection
1/8 NPT female
1/8 NPT female with flush port
(ranges 10 psi and over)
G 1/8 British standard
G 1/8 British standard with flush port
(ranges 10 psi and over)
Welded VCR fitting with standard finish
• Other Options
FM Approved (for use with FM approved base unit)
CE Mark (for use with CE Mark rated base unit)
Temperature Interface Modules
• HQS-RT1 and HQS-RT2 interface modules allow the PTE-1 to
measure temperature with an RTD.
• HQS-RT1: Accommodates Pt100, Ni120, Cu120, and other common
2, 3, or 4 wire probes with resistance outputs of 400 ohms or less.
• HQS-RT2: Accommodates Pt1000 and other common 2, 3, or 4 wire
probes with resistance outputs of 4000 ohms or less.
• Selectable Units of Measure
°C, °F, °K, °R and ohms
• Input Receptacle
Accepts TA4F type RTD connector
• RTD Probes Available
Pt-100 probes, 6" or 12" length, with or without handle. DIN Class A
accuracy. Includes mating TA4F connector. Consult factory for
details and availability.
• The HQS-TC1 interface module allows the PTE-1 to measure
temperature with a thermocouple
• Compatibility
Programmed to provide direct temperature readout from types J, K,
T, E, R, S, B, & N thermocouples or direct millivolt readout from any
• Reference Junction
Automatic internal or manual external
• Resolution
Automatic or manually selectable, up to .01°
• Units of Measure
Selectable; °C, °F, °K, °R, and millivolts
• Receptacle
Accepts "miniature thermocouple connector", Omega® type SMP
110Vac/60 Hz ac Adapter
220Vac/50 Hz ac Adapter
Contoured protective case
Soft carrying case
Hard carrying case
Field Link 2 Software package - to create certification documents
from datalogged data
• LPSIIa External 24vdc Loop Power Supply - to power transducers
and pressure switch test circuit
• SM-1 Voltage Adapter - allows PTE-1 to be used to check "live"
pressure switches
Operating Characteristics
• Damping: (Measurement
Averaging) Programmable
averaging from zero through
16 consecutive readings
• Warm-Up: 5 minutes for rated
accuracy (max.)
Temperature Effect for
Electrical Measurement
• ±.001% of Span per °F over
compensated range
Electrical Measurement
Input (volts)
0/10 Vdc
0/30 Vdc
Auto Ranging 10/30 Vdc and
Serial Interface
• Type
• Baud Rate
300, 1200, 2400, or 9600 selectable
Frequently Asked Questions
Question: What are the primary components of a PTE-1?
Answer: PTE-1 systems include a base unit and the desired selection of interchangeable Quick
Select pressure modules. The base unit incorporates the firmware that provides the diverse
measurement capabilities of the PTE-1. The base unit acts as the host for the Quick Select
pressure measurement modules. Quick Select modules slide into "sensor bays" located in the
base unit. The base unit can simultaneously accommodate two Quick Select modules of any
combination of range and accuracy. One or both Quick Select modules may be active and the
measured value displayed on the liquid crystal display of the PTE-1.
Quick Select pressure modules are designated HQS-1 and HQS-2.
The HQS-1 is a specialized low-pressure sensor module. This module is manufactured to provide
pressure measurement capability from a range of 0/0.25 inches of water through 0/200 inches of
water. The HQS-2 Quick Select pressure module is primarily manufactured for ranges of 0/5
through 0/10,000 psi. Additionally, the HQS-2 is available in ranges of 10, 15, 25 and 50 inches of
water for less demanding applications than those that can be serviced by the HQS-1.
Calibration data is stored in EEPROMs that are resident in each Quick Select pressure module
and the base unit. Since the pressure calibration is resident in the Quick Select pressure module,
any module can be used in any base unit. The accuracy specification for the Quick Select module
includes the maximum inaccuracy contribution from the base unit. When installed in any base unit,
the PTE-1 system will provide the measurement accuracy specified for the installed Quick Select
pressure module.
Question: How does the HQS-1 sensor work?
Answer: The sensor in the HQS-1 Quick Select pressure module measures pressure through a
method known as variable capacitance. Inside the sensor there is a micro-machined silicon
diaphragm. This diaphragm is between two non-moving plates on which a metal has been
sputtered. Air in between the diaphragm and the non-moving plates acts as an insulator. As
pressure vacuum is applied to the sensor, the diaphragm moves changing the distance between
the diaphragm and the fixed plates. This change in distance changes the capacitance of the
sensor. It is this variable capacitance that is measured and correlated to pressure or vacuum
values during the calibration process.
The sensor is connected to an ASIC (Application Specific Integrated Circuit). This ASIC generates
a linear signal ramp and applies this signal to the top plate of the sensor while an equal and
opposite signal is applied to the bottom plate.
When the pressure is balanced (i.e., both ports opened to atmosphere) the space between the
diaphragm and each of the fixed plates is the same. When this is the case all the signal to the top
plate is capacitively coupled to the equal and opposite charge signal sent to the bottom plate and,
therefore, no signal current will flow through the center plate (diaphragm). If an imbalance is
present, as would happen when the diaphragm moves off center due to the input of pressure or
vacuum, the excess current flows through the center plate (diaphragm) to the input of a
differentiator in the ASIC. The differentiator translates the frequency of the sensor output into a
voltage, which in turn is scaled over the full scale range of the instrument. The amplified sensor
output is then calibrated over the operating pressure range. The calibration coefficients for the
sensor are stored in EEPROM (Electrically Erasable Programmable Read Only Memory) within
the Quick Select pressure module.
Question: What is the sensing method of the HQS-2 Quick Select pressure module?
Answer: The HQS-2 Quick Select pressure module incorporates a micro-machined piezoresistive
strain gauge type sensor. This technology makes use of the fact that when put under stress (as
with the flexing of a diaphragm under pressure) the resistive properties of a piece of silicon will
change. In the manufacturing process resistors are deposited in a silicon substrate. The resistors
are typically configured in a wheatstone bridge orientation. When positioned in this fashion, the
output will be near zero at zero pressure and will increase in a near linear fashion with the
application of pressure. The reverse side of the substrate is then etched to the required thickness
for a given pressure range.
When power is applied to the sensor the level of resistance across the wheatstone bridge will
change in proportion to the level of applied pressure. The output from the sensor is extremely
repeatable and has minimal hysteresis due to the fact that the sensor substrate is silicon. The
sensor output can then be amplified by electronic circuitry within the module and can be calibrated
over the operating pressure range. The calibration coefficients for the sensor are stored in
EEPROM (Electrically Erasable Programmable Read Only Memory) within the Quick Select
pressure module.
Question: What are the available ranges for the Quick Select pressure modules?
Answer: The PTE-1 system provides the broadest range of pressure measurement capability
available in a single handheld calibration system. Overall, Quick Select pressure modules are
available in ranges from 0.25 inches of water through 0-10,000 psi.
As previously outlined, there are two basic types of Quick Select pressure modules available for
the base unit. The first type, designated HQS-1, uses a capacitance sensor and is ideal for low
pressure measurement. This sensor is available in differential (used for gauge or differential
measurements) and compound pressure types. The HQS-1 is available in gauge/differential
ranges from 0/0.25 to 0/200 inches of water. The compound pressure version of the HQS-1 Quick
Select pressure module is available in ranges from ±0.125 to ±100 inches of water (see the price
list or product bulletin for a complete list of HQS-1 sensor modules.)
The HQS-2 is available in ranges from 0/10 inches of water through 0/50 inches of water and
0/5 psi through 0/7500 psi. The inches of water ranges are limited to gauge pressure only and an
accuracy of ±.25% of span. For low pressure measurement applications that require higher
accuracy or differential pressure measurement capability an HQS-1 Quick Sensor module should
be specified. The ranges of 0/5 psi through 0/10,000 psi are available in gauge and absolute
pressure types.
Question: What are the available accuracies for the Quick Select modules?
Answer: Quick Select sensors are available in accuracies ranging from ±.025% of span through
±0.1% of span. The actual accuracies available vary by range.
Question: Can the PTE-1 be recalibrated in the field?
Answer: Yes!
The base unit of the PTE-1 system includes the required firmware to recalibrate both Quick Select
pressure modules and the base unit electronics. All calibration routines are menu driven. The
calibration program is activated through the set-up menu accessed by pressing the Set-Up key on
the keypad of the PTE-1 base unit. Access to the calibration firmware is password protected to
help minimize the risk of unauthorized personnel modifying or accidentally entering incorrect
calibration data.
Question: What is the media compatibility of the various Quick Select modules?
Answer: All HQS-1 sensors are suitable for use on clean, dry, non-corrosive and non-conductive
All HQS-2 ranges above 0/5 psi are supplied in standard configuration with 316 Stainless Steel
media isolation.
Question: What is the power source of the PTE-1 system?
Answer: The PTE-1 system is powered by two 9 Vdc alkaline batteries. Estimated battery life is 30
hours. However, actual battery life will vary based on environmental conditions (primarily
temperature) and the number and type of instrument capabilities, options or accessories in use. An
AC adapter is available as an option. The AC adapter is included in the kit configurations of the PTE1 system.
Question: What will affect the length of time the PTE-1 will operate on a set of 9 VDC
Answer: There are two primary things that will reduce the battery life below the 30 hour level
provided by two 9 volt Alkaline batteries.
They are:
Temperature extremes: both high and low temperatures reduce battery life. For alkaline batteries
maximum battery life, in an application such as the PTE-1, is achieved at temperatures of 20-30
degrees Celsius (68-86 degrees Fahrenheit). Operation of the calibrator at temperatures outside this
range will result in reduced battery life.
The RS232 interface requires 4mA when activated. If the RS232 interface is left enabled (activated)
battery life will be reduced from 30 hours to approximately 23 hours. Therefore, to prolong battery
life, the RS232 interface should be disabled when not in use.
Regardless of the type of battery installed, operation of the PTE-1 in temperatures outside the 20-30
degrees Celsius limits and the use of the RS232 interface will result in diminished battery life.
Use of other product features, such as those accessed from the front panel, single or dual installed
Quick Select pressure modules or use of current or voltage measurement capabilities will have
negligible effects on the length of time the PTE-1 will run on a fresh set of installed batteries.
Question: What about the use of non-alkaline batteries on the PTE-1 system?
Answer: The PTE-1 includes a monitoring system, accessed through the battery check function,
that provides the ability to check the power level remaining in the batteries as well as the
estimated remaining battery life as a percent of the 30 hour nominal battery life. The battery
voltage measurement provided will be accurate, regardless of the type of batteries installed.
However, the estimate of the remaining battery life is calculated based on the discharge curve
(depletion of stored level of electrical power with use) of an alkaline battery. The discharge curves
for non-alkaline batteries are significantly different than those provided by alkaline batteries.
Therefore, if a PTE-1 is used with any type of non-alkaline batteries the estimate of remaining
battery life provided by the battery check function will be incorrect.
– The estimated battery life of a PTE-1 on the most common forms of 9 Volt batteries follows
for your reference.
– Type of Battery - Estimated Battery Life
– Standard Alkaline - 30 Hours
– Standard Non-Alkaline - 15-20 Hours
– Rechargeable Nickel Cadmium - 7-10 Hours
– Lithium - 40 Hours
Question: The PTE-1 has standard built-in software damping. What does this do?
Answer: Damping allows the operator to stabilize the display from the effects of low level
pressure fluctuation, electronic noise or vibration in the area that the pressure measurement is to
be performed. HQS-1 Quick Select pressure modules have extremely high sensitivity to very small
changes in pressure. Damping will allow the operator to minimize the effects of this sensitivity, if
desired, by setting the damping function as required.
HQS-2 Quick Select pressure modules may be used to monitor pressures that have low level
fluctuations or vibration characteristics. Damping may, at times, be required to eliminate display
instability resulting from process media conditions.
Question: How does the PTE-1 damping work?
Answer: The operator can program the damping function to average from one (no damping) to 16
readings. For example, if the damping is set at the midway point 8 readings will be averaged. The
averaged value is then used to update the display. The PTE-1 updates the displayed pressure
reading every 100mS. If eight readings are averaged, the displayed value will represent the
average pressure measurement over the preceding 800 mS (8 readings times 100 mS per
Question: Won’t damping slow down the instrument response to a real pressure change?
Answer: Yes!
The greater the level of damping the slower the calibrator will be to reflect the total magnitude of a
pressure change. For example, if damping is set at the maximum value of 16 and there was a step
change in pressure, it would take 1.6 seconds (16 times 100 mS per reading) before the calibrator
display and any transmitted data reflected full extent of the pressure change. Therefore, the level
of damping in use should be minimized to allow the calibrator to provide the fastest response time
to changes in measured pressures.
Question: What are the capabilities of the optional data logging function of the PTE-1
Answer: The data logging option allows for manual, automatic or time delayed data logging.
These capabilities can be summarized as follows:
Manual data logging: Operator stores measured values from left, right or both sensors at the push
of the data store key on the keypad. The measured value may be stored in terms of pressure or
flow (velocity or volume). In addition, if the output of only one sensor is to be logged, a measured
current or voltage value that is displayed on the PTE-1 can also be logged concurrent with the
logging of the pressure value. The measured values will be stored sequentially in the data logging
Automatic data logging: This mode of operation allows for unattended logging of measured values
from the left, right or both sensors at an operator programmed time interval from 0.1 seconds to
65,000 seconds. The measured value may be stored in terms of pressure or flow (velocity or
volume). In addition, if the output of only one sensor is to be logged, a measured current or
voltage value that is displayed on the PTE-1 can also be logged concurrent with the logging of the
pressure value. The measured values will be stored sequentially in the data logging memory.
Automatic Event Timer data logging: This mode of operation allows for unattended logging of
measured values from the left, right or both sensors during a future time period. Like a VCR the
PTE-1 can be programmed to record an input to the device over a given period of time. When the
data logging function is used with the event timer function the PTE-1 can be programmed to data
log the desired measurement values from time A to time B at a programmed interval of T. For
example, the PTE-1 can be programmed to record the measured values of the left sensor from
10:00 P.M. to 11:00 P.M. at an interval of 60 seconds. When programmed in this fashion, the PTE1 will automatically turn itself on at 10:00 P.M., taking readings every 60 seconds, and turn itself
off at 11:00 P.M.
Stores values can be reviewed on the display of the PTE-1 or uploaded as an ASCII file to a
computer for importing into a spreadsheet or data base program.
If the output of only one sensor is to be logged, a measured current or voltage value that is
displayed on the PTE-1 can also be logged concurrent with the logging of the pressure value. The
measured values will be stored sequentially in the data logging memory.
Question: How many measurements can the data logging option store?
Answer: With the date/time stamp enabled, meaning every measurement value will be logged
with the date and time the measurement was taken, the calibrator can store 384 sets of data. With
the date/time stamp capability disabled a total of 714 sets of data can be stored.
Question: Exactly what information can be logged?
Answer: Pressure measurement, flow measurement, current measurement and voltage
measurement information can be logged. A data set includes the following information: data point
number, measured value, unit of measure and, if enabled, date and time information. The data
logging stores measurement data seen on the base unit display. Data can be logged from the left,
right or both sides of the LCD display.
Question: What is the format of the logged data?
Answer: Data can be uploaded from the calibrator in either of two formats. The first is the unparsed format and the second is the parsed format. When the un-parsed method is used the
entire date will appear in one column and the entire time will appear in a single column. If the
parsed method is selected, the time will be presented in individual columns for hours, minutes and
seconds and the date information will be presented in individual columns for the day, month and
year. At the end of the Questions & Answers text you will find sample printouts for both parsed and
un-parsed data. Two samples are provided for each. The first provides the output layout for a
calibrator logging the output from 2 Quick Select pressure modules. The second shows the data
display format for a calibrator logging the output of a single Quick Select pressure module and a
mA measurement.
Question: Where is the Quick Select pressure module calibration data stored?
Answer: Each Quick Select pressure module includes an Electrically Erasable Programmable
Read Only Memory chip (EEPROM). The calibration data for the given sensor, including
temperature correction and linearization information, is stored in this EEPROM.
Question: What causes the limitations on storage temperature to be –4 to +158°
Answer: The storage temperature limits are the result of the liquid crystal display used in the
handheld calibrator. Liquid crystal displays can be damaged at extreme temperatures. Typically,
damage results in the display not providing the desired level of contrast. Unfortunately, this is a
limit of the currently available LCD technology. No extended range for storage temperature is
Question: Is there a need to measure voltages above the 30 Vdc limit of the calibrator?
Answer: As of this time we have not run into requests for the capability to measure higher voltage
levels. If this becomes an issue we will review the need further. It is not likely that the
measurement range could be expanded without significant redesign of the product. At this time,
we do not anticipate that this will pose any significant obstacle to selling the calibrator.
Question: Can we send information from a computer to the calibrator?
Answer: No. The calibrator RS232 interface is an input output interface but, other than factory
calibration, at this time, there is no support for input of commands or information. A modbus, two
way communication protocol, is being developed for use in gas transmission applications. For
further information, contact factory customer service.
Question: Is the calibrator suitable for use in the rain?
Answer: The calibrator is not water tight. Rain would likely penetrate into the calibrator enclosure
through the miniature banana jacks on the keypad as well as through the sensor bays. However, a
contoured carrying case provides added weather resistance.
PTE-1 Handheld Unit
Braided Steel Sensing Line Hose
PTE-1 Handheld Unit with Sensing
Line Hose
Non-Inserted HQS-2 Pressure
Inserted HQS-2 Pressure Module
Quick Disconnect Parts
Field Quick Disconnect Input
PTE-1 Field Use
PTE-1 Field Use
PTE-1 Field Use