Transcript ACT20P Bridge Presentation

ACT20P Bridge
Configurable
Strain Gauge Transmitter
ACT20P Bridge – key points
Silo
 Transmitter for reading strain gauges (load
cells) via Wheatstone Bridge circuits
- Can be used with up to 4 load cells
- Adjustable for different load cells via push buttons,
under front cover..
- “Tare” correction via remote contact input
- 0,05% measurement accuracy.
Strain gauge under each silo leg
(4)
Strain gauge / load cells - elements
Strain gauges – in action
Load
ACT20P Bridge – Ins and Outs
Measuring weight / level / contents
Fill control
PLC
DC supply
Isolated analog
output
ACT20P
Bridge
Tare weight input
4 load cells
Load cell summing box
Load cell input
Empty wagon
detector
Tank weighing
Product positioning
ACT20P Bridge
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For multi-load cell applications, e.g.
Process automation, Silo level control
DIP switch and pushbutton adjustable
Auto-tare input
Wave PRO Bridge
 For single load cell applications, e.g. Factory
automation, test equipment
 DIP switch adjustable
Acromag: 800 Series
 851T- plus points
+ math computations, Software configuration
+ Supports 85 ohms or greater with 10V excitation
+ Alarm (relay) output (optional higher price $438)
= Auto tare input
= V / mA output
= Bridge input 4-11V
= CE marked. UL, cUL listed
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851T- not so good…
- High price $354 for 50 pieces
request
- No test point for mA output
- Not well known outside NA
- 26mm wide housing
- Housing feels cheap
- Connectors not user-friendly
- No push-buttons
- Power only supply 12 to 36V DC
Action Instruments: Ultra Slim Pack II WV448
 WV448 :
+ 17,5mm small housing
= Calibration via push-button
= V / mA output
= Bridge excitation 1-10V
= CE marked, UL, cUL listed
- No tare digital input or push-button
- Only 4-wire bridge connections
- Response time 150ms (10 to 90%)
- 0°C to +60°C ambient
- 9 to 30VDC
- Isolation: 1800VDC
PR Electronics: 2261
 2261 :
+ Display integrated
+ Load max. 230mA
= Tare digital input or with push-button
= Configuration via push-button
= V / mA output
= Bridge input 5-13V
- 35mm wide housing
- Backplane connection
- Only CE (no UL)
- -20°C … +60°C
- Power supply 12 to 36V DC
- Not well known world wide
Target markets & applications
 Market sectors and applications
- Food & beverage – recipes – mixing
- Materials handling – weighing while loading, solids storage
- Cement plants – silos filling/emptying controls, bag filling
- Metals – weighing while transporting,
- Flour milling – storage silos, bag filling
- Engine test equipment – torque, load, strain measurement
ACT20P Bridge Overview
Transmitter for reading strain gauges (load cells) via Wheatstone Bridge circuits!
Converts strain gauge input to
standardized isolated analog output.
Can be used with up to 4 load cells.
Exact Measurement with 4- or 6-wire sensor
connection method and very high accuracy of
0.05% for precise signal processing.
Push buttons provide for simple and
reliable on-site calibration of different load
cells.
5.7kV isolation between input, output and
power supply protects against transients
and secures PLC input.
Simple tare compensation of the empty weight or zero
offset, manually via push button on front panel or
external connection via PLC output.
ACT 20P Bridge Launch Material
Launch Details
 Sales Flyer – LIT1105
 Stock available in Richmond, VA
 PR and Sales Flyer available for download at www.weidmuller.com and in
Resource Center (B2B)
 Detailed Presentation available for download in Resource Center (B2B)
Thank you for your interest!
Back-up section
ACT20P Bridge – Calibration low level
Skipping of calibration points
 While the tank is at low level,
 Push Up/Down buttons together to enter the
calibration mode
 Set the output to 5.6mA using the UP/Down
pushbuttons
 Push the Enter button, which enables the High
level calibration
Low is approx 10% of tank = 5.6mA
PLC
ACT20P Bridge – Calibration high level
 With the contents at the high level
 Use the Up/Down pushbuttons to adjust output
to 17.6 mA.
 Now the ACT20P Bridge can accurately
measure the tank level/volume.
High is approx 85% of tank = 17.6mA
PLC
( Titel of the präsentation, Date, Department, Author)
Page 18
Under the front flap – adjustments
Calibration pushbuttons
Strain gauge - specifications
Demo rail – with live load cell measurement
Definitions
- Strain gauge:
The (resistance) sensor element of a load cell (typ. 350Ω)
- Load cell:
Device for sensing load, weight, torque
- Wheatstone Bridge:Circuit for measurement of resistance – located in each load
cell.
- Gauge Factor:
Describes the output of the strain gauge per Volt of supply to
the bridge. E.g. 2mV/V means for a 10V supply voltage the
strain gauge output at
maximum load is 20mV – so the input
range of the ACT20P Bridge might be
0 – 20mV.
- Excitation voltage: The supply voltage for the Wheatstone bridge, commonly 5V
or
10VDC, and derived from the ACT20P Bridge.
- 4-wire input:
The connections between the ACT20P Bridge and the load cell
are the input (+), input (-), Excitation (+), Excitation (-).
- 6-wire input:
In addition to the 4-wire connections (above), there are
sense (+) and
sense (-) for temperature compensation for the
input connections.