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CONFIGURATION
The transmitter is configured with jumpers located on the circuit board as shown on the PCB drawing in
Figure 5. These jumpers are used to select the output signal type and the bipolar range/unipolar range (±
or 0-MAX).
The unit is factory configured to operate in the 4-20 mA output mode. To change to 0-10 Vdc out put
move the jumper to the VOLT position as shown in Figure 6.
The unit is factory set to unipolar. To change to bipolar move the jumper to the +/- position as shown in
Figure 7.
For example, if the model is for 2"wc and is the jumper labeled (±) is also selected, then the pressure
range will be -2 to +2"wc. This means that each model has two pressure ranges, a bipolar range (±), and a
unipolar range, 0-MAX.
PNEUMATIC CONNECTIONS
The one pressure port on the side of the enclosure is labeled Low. The static probe is the High port. This
output signal reads a positive value when the port pressure is higher on the High port than the Low port.
Use 0.170"I.D. flexible tubing for the pressure connections. Arrange the tubing to minimize the stress on
the connections and ensure there are no kinks in the tubing.
Ensure the tubing to be used is clean and do not allow material to fall into the pressure ports as
contamination could damage the sensor. When removing tubing use care to avoid breaking the ports. In
some cases it is better to cut the tubing off rather that pulling it off but be careful not to cut the fitting or
an air leak may occur.
POWER UP INSTRUCTION
Before turning on the power, verify all wiring to ensure that it complies with one of the included wiring
diagrams and verify that the output signal type is correctly selected with the jumpers. Also, review the
specifications to ensure the power supply is correct and that the pressure is within the correct range.
At this time, also inspect the internal pressure tubing that connects the sensor to the external ports to
ensure that the tubing did not get kinked during shipping or installation.
Proper operation can be verified by measuring the output signal. For voltage output configuration,
measure the voltage between the OUT and COM terminals. The voltmeter should read between 0-10
Vdc. For current output configuration, insert a mA meter in series with the OUT terminal. The mA meter
should read between 4 and 20 mA.
OPERATION
If the unit is set to a unipolar range such as 0-2” wc, then the pressure applied to the High port must be
higher than the pressure applied to the Low port. In this case, if the Low port is left open to ambient
pressure and the High port is used to measure a positive pressure, then the output pressure can be
calculated as follows:
4-20 mA
Pressure = [(Output current - 4 mA) / 16 mA] x Range
0-10 Vdc
Pressure = (Output voltage / 10 V) x Range
In the case of 0-2” wc, 4 mA or 0 V = 0” wc and 20 mA or 10 V = 2” wc. Since the transmitter is linear, 1” wc
would be 12 mA or 5 V. If the positive pressure connection is reversed then the transmitter will always
output 4 mA or 0 V.
If the unit is set to a bipolar range such as ± 1” wc, then the pressure applied to the High port should be
higher than the pressure applied to the Low port for a positive output response. In this case, differential
pressure can be measured using both ports. If the High port has a positive pressure with respect to
the Low port, then the output indicates a positive pressure. Negative pressure is indicated if the High
pressure is less than the Low pressure. For bipolar ranges, the output pressure can be calculated as
follows:
4-20 mA
Pressure = [(Output current - 4 mA) / 16 mA] x 2 x Range - Offset
0-10 Vdc
Pressure = (Output voltage / 10 V) x 2 x Range - Offset
CALIBRATION
All pressure ranges are factory calibrated and no calibration is necessary. The user may adjust the zero
point if desired when changing ranges for example. Make sure the unit is warmed up for at least 10
minutes (1 hour is best) before making a zero adjustment. With both ports open to the ambient pressure,
press and hold the ZERO button for at least 3 seconds. Release the button after at least 3 seconds and
the device will calculate and store the new zero point.
IN-GE-ELPXXXXS-01-03 11/19
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