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4-20 mA Transmitter Calibration
Procedure
WARNING
Due to load resistance change from product to
product, it may be necessary to recalibrate the
4-20 mA transmitter.
1.0 Test Equipment
1.1 Digital Multimeter. Set multimeter to read
mA DC
1.2 Load resistor. Select a series Load Resistor
between 200 and 900 ohms.
2.0 Interconnect Wiring
TB1
24 Volts
~24 V
1
AC or DC
~24 V
2
6VA Max
Input Power
3
Earth Ground
TB2
Load Resistance
4 to 20 mA/
1
2-10 Vdc (+)
200-900 Ohms
4 to 20 mA/
2
2-10 Vdc (-)
Shield
3
Temperature
4
Sensor
5
2.1 Validate the controller is setup for 4-20 mA output
signal.
2.2 Validate the power is off on the DC power supply
and the Sure-Aire controller.
2.3 Validate the multimeter is set to read mA DC.
2.4 Select a series Load Resistor between 200 and
900 ohms and install one end to TB2-1.
2.5 Interconnect the multimeter (+) probe to the other
end of the load resistor.
2.6 Interconnect the multimeter (-) probe to TB2-2 to
complete the current loop.
2.7 Apply power to the Sure-Aire controller.
2.8 Press the Setup button on the Touch Panel
interface.
2.9 Keep pressing Next button until you reach the
Transmitter Min Value screen.
2.10 Press Edit, then Inc or Dec until the digital
multimeter reads exactly 4.00 mA.
Greenheck
Sure-Aire V 1.00
Transmitter Min Value:
Exit
Inc
Dec
2.11 Press Enter to store the new value.
2.12 Press Next.
®
Greenheck
Sure-Aire V 1.00
0.0010
CFM
3.96
mA
Setup
Up
Down
Sure-Aire Controller
LCD Touch Display
1827
Enter
2.13 Transmitter Max Value.
Greenheck
Sure-Aire V 1.00
Transmitter Max Value:
Exit
2.14 Press Edit, then Inc or Dec until the digital
multimeter reads exactly 20.00 mA.
2.15 Press Enter to store the new value.
2.16 Press Exit to return to the main screen.
2.17 4-20 mA transmitter calibration completed.
Apply a vacuum to the High Port and the 4-20 mA
transmitter will track the span of the pressure range.
i.e. The Sure-Aire controller with a pressure sensor
of 0 - 41.51 in. W.C. installed, 4.00 mA = 0 in. W.C.,
20.00 mA = 41.52 in. W.C.
Home
720
Inc
Dec
Enter
NOTE
Sure-Aire™ Flow Monitoring System
5
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