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INTRODUCTION

The Low Pressure Transducer can be used to measure positive, 

negative or differential pressure in the ranges of 1”wc to 20”wc. 

The highly accurate piezoresistive sensor is ideal for monitoring 

pressure of non-corrosive, non-ionic working fluids such as clean 

dry air or other inert gases. It features field selectable pressure 

ranges and output signal types for the most flexible application. 

Typical HVAC applications include monitoring of filter differential 

pressure or clean room pressure. The output signal is factory 

calibrated and temperature compensated for highest startup 

accuracy and trouble-free operation.

BEFORE INSTALLATION

Read these installation instructions carefully before 

commissioning the Pressure Transducer. Failure to follow these 

instructions may result in product damage. Do not use in an 

explosive or hazardous environment, with combustible or 

flammable gases, as safety or emergency stop devices or in 

any other application where failure of the product could result 

in personal injury. 

Use electrostatic discharge precautions during installation and do not exceed the 

device ratings.

MOUNTING

The transducer mounts on a vertical surface using the two integrated mounting holes. Ensure there is 

enough space around the unit to connect the pressure tubing without kinking and to make the electrical 

connections, avoid locations with severe vibrations or excessive moisture. Drill a hole in the duct and 

insert so the probe point is facing into the air flow. The enclosure has a standard opening for a 1/2” 

conduit and may be installed with either conduit and a conduit coupler or a cable gland type fitting. See 

Figure 1. 

The two mounting holes will facilitate a #10 size screw (not supplied). See Figure 1.

The enclosure has a hinged cover with a latch.  Open the 

cover by pulling slightly on the latch on the right side of 

the enclosure and at the same time pulling on the cover, as 

illustrated in Figure 2.

A 1/2" NPT threaded connection hole is provided on the 

bottom side of the enclosure. Screw the EMT connector 

or cable gland connector in until tight. See Figure 3. It is 

recommended that weatherproof conduit or cable gland 

fittings be used. The F style enclosure includes 1/2" NPT to M16 

thread adapter and cable gland fitting. See Figure 3.

Two security screws are provided which can be installed to 

help secure the cover once settings and wiring connections are 

complete. See Figure 4.

Figure 1

Figure 2

Figure 3

Figure 4

EMT Connector

Thread adapter and 

cable gland fitting

IN-GE-LPXXXS-02

Copyright © Greystone Energy Systems, Inc.   All Rights Reserved    Phone:  +1 506 853 3057  Web: www.greystoneenergy.com

Duct Low Pressure Transducer

LP-S - Installation Instructions

Summary of Contents for LP-S

Page 1: ...ace around the unit to connect the pressure tubing without kinking and to make the electrical connections avoid locations with severe vibrations or excessive moisture Drill a hole in the duct and insert so the probe point is facing into the air flow The enclosure has a standard opening for a 1 2 conduit and may be installed with either conduit and a conduit coupler or a cable gland type fitting Se...

Page 2: ...signal is available on the OUT terminal This signal is switch selectable for either a voltage output or a standard loop powered 4 20 mA output signal type When voltage mode is selected either 0 5 Vdc or 0 10 Vdc can also be selected These options are clearly indicated on the device circuit board The analog output signal is typically connected directly to the Building Automation System B A S and us...

Page 3: ...ng 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 switches Also review the specifications to ensure the power supply is correct and that the pressure is within the correct ...

Page 4: ... Thermal Effects 3 over compensated range Compensated Range 0 to 50 C 32 to 122 F Proof Pressure 40 W C 100 for 10 20 models Burst Pressure 60 W C 200 for 10 20 models Operating Conditions 0 to 50 C 32 to 122 F 5 to 95 RH non condensing Power Supply 20 28 Vac dc non isolated half wave rectified Supply Current 4 mA for voltage output 20 mA max for current output Input Voltage Effect Negligible over...

Page 5: ...D IN CANADA 116 5 mm 4 58 99 7 mm 3 93 0 5 NPT 96 27 mm 3 79 49 27 mm 1 94 112 5 mm 4 43 53 7 mm 2 11 IN GE LPXXXS 02 Copyright Greystone Energy Systems Inc All Rights Reserved Phone 1 506 853 3057 Web www greystoneenergy com ...

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