DPTH High Accuracy Differential Pressure Transmitter-Operation Manual Edition: A/2
2
Connection
Different models have different electrical connections.
RS485/Modbus communication refer to “DPT series Modbus Communication Manual”. RS485 terminal resistance jumper J8 is
described as follows:
Terminal resistance 120 Ω：the jumper J8 is at position “on”
Terminal resistance 0 Ω(None)：the jumper J8 is at position “off”
As shown below:
Button
“SET”: Set/Confirm/Save; “SEL”: Bit Select/Decrease/ Zero Reset（press for 5s）; “ADJ”: Adjust/Increase;
See the operation instruction for the button operation.
Installation
● The installation site should be far away from heater, cooler, fan or other humidity and ventilation sources. Figure 1 is bottom
view of the product, for opening the 4 holes on the mounting surface.
● It should to be installed vertically on the wall, with the outlet gland downwards, shown as figure 2. Open the front cover and
screw the base on the mounting surface with 4 mounting screws.
● Feed the cable into the base through the cable gland, finish wiring according to the wiring diagram. Restore the front cover and
finish the pressure connection, pay attention to the difference between high (+) and low (-) pressure ports. Make sure to
completely air-tighten the gland to the base and the cover to the base with the seal rings, thus the housing overall protection
rate could meet up to IP65.
Zero reset & Calibration
According to different environment and sensor’s characteristics, for long term of using, the sensor’s accuracy maybe drift. The
transmitter should be zero reset after initial power on to meet the specified accuracy, and be zero reset periodically in every 6-12
months’ using. It is recommended to be “zero reset” after the initial 7 days continuous working.
Zero reset: keep the high（+）/low（-）pressure ports unconnected in stable air, or directly connect them, press the button “SEL”
for 5s to perform “zero reset”. It means “remove the zero drift of the transmitter in order to improve the accuracy”. It
isrecommended that this operation could be done periodically.
RS485
9600,8,N,1
Slave Add.= 1
B
A
V
POWER SUPPLY
24VDC
A
POWER SUPPLY
24VDC/AC
V+ GND OUT
Voltage Output Model
Current Output
RS485 Model
POWER SUPPLY
24VDC/AC
V+ OUT
V+ GND B A
120
J8
ON
1
120
J8
ON
1
Terminal resistance：120 Ω
Terminal resistance：None Default
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