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PT-405 Series Pressure Transmitters
Installation Guide

Heavy Duty, Explosion Proof

R

APG

Automation Products Group, Inc.

1025 W 1700 N Logan, UT 84321

www.apgsensors.com | phone: 888-525-7300 | email: [email protected]

Thank You

Thanks for purchasing a Series PT-405 pressure transmitter from us! We appreciate your business 

and your trust. Please take a moment to familiarize yourself with the product and this manual 

before installation. If you have any questions, at any time, don’t hesitate to call us at 888-525-7300.

This product is covered by APG’s warranty to be free from defects in material and workmanship 
under normal use and service of the product for 24 months. For a full explanation of our Warranty, 
please visit 

https://www.apgsensors.com/about-us/terms-conditions

. Contact Technical Support to 

receive a Return Material Authorization before shipping your product back.

Scan the QR code below to read the full explanation of our Warranty on your tablet or smartphone.

1.Description
2. How To Read Your Label
3. Warranty
4. Dimensions

5. Mounting Instructions
6. Wiring Information
7. Zero Trimming
8. Re-calibration

9. General Care
10. Repair Information
11. Removal Instructions

6

Wiring Information

Table of Contents

 

 

5

Mounting Instructions

The PT-405 should be installed in an area--indoors or outdoors--which meets the following 

conditions:

• 

Ambient temperature between -40°F and 185°F  (-40°C to 85°C)

• 

Relative humidity up to 100%

• 

Altitude up to 2000 meters (6560 feet)

• 

IEC-664-1 Conductive Pollution Degree 1 or 2

• 

IEC 61010-1 Measurement Category II

• 

No chemical corrosive to stainless steel (such as NH

3

, SO

2

, Cl

2

, etc.)

• 

Ample space for maintenance and inspection

• 

Explosion proof conduit, with seal installed within 18 inches, must be used for cable 

connection to PT-405.

• 

Class II power supply

Mounting your pressure transducer is easy if you follow a few simple steps:

• 

Never over-tighten the sensor. This can compress the diaphragm, changing how it reacts 

to pressure. In all cases, tighten the sensor as little as possible to create an adequate seal. 

On straight threads, tighten only until you feel the o-ring compress - making sure you don’t 

damage or extrude the o-ring.

• 

Always use thread tape or sealant compound on tapered threads. Straight threads use an 

o-ring. If using thread tape, wrap the tape in the opposite direction of the threads so it does 

not unravel as you screw it into place. Unraveling can cause uneven distribution and seal 

failure.

• 

Always start screwing in your sensor by hand to avoid cross-threading. Thread failure can be a 

problem if you damage threads by over-tightening them or by crossing threads.

4

Dimensions

 

NOTE

: Scan the QR code to the right to see the full 

user manual on your tablet or smartphone. Or visit 

www.apgsensors.com/support to find it on our website.

Part # 200126

Doc #9005324 Rev A1

Each label comes with a full model number, a part number, and a serial number. The model 

number for the PT-405 will look something like this:

The model number correlates with all the configurable options and tells you exactly what you have. 

Compare the model number to the options on the datasheet to identify your exact configuration. 

You can also call us with the model, part, or the serial number and we can help you.

The label also includes the pinout, as does this installation guide.

You’ll also find all hazardous certification information on the label. 

 

SAMPLE

PT-405-L1-5000-PSIS-E60-5-P5-N0-M2-S2

Series PT-405 pressure transmitters offer reliability over a wide range of pressures and in harsh 

industrial conditions and hazardous locations. They are certified explosion proof for hazardous 

areas in the US and Canada by CSA for Class 1, Division 1 environments. 

1

Description

2

How To Read Your Label

3

Warranty

PT-405 Short Can (E60 option)

with NPTF process connection

Total length of PT-405 depends on selected process connection

 

IMPORTANT

: Some Modbus manufacturers use reversed Tx+/Tx- pins. When connecting to 

your system, ensure A to A and B to B connections.

2.35"

 [59.7mm]

0.35"

 [8.9mm]

0.91"

 [23.05mm]

0.61"

 [15.45mm]

0.71"

 [18.1mm]

3.33"

 [84.6mm]

0.35"

 [8.9mm]

0.91"

 [23.05mm]

3.61"

 [91.6mm]

4.59"

 [116.5mm]

PT-405 Long Can (E60L option)

with NPTF process connection

PT-405 Se

ries Pi

n Out Table

Pigtail

4-20 mA

0-5 / 0.5-4.5 / 1-5 VDC

0-10 VDC

RS-485

Red + Excitation

+ Excitation

+ Excitation

+ Excitation

Grn

No wire

+ Output

+ Output

B (Tx-)

Wht

No wire

- Output

- Output

A (Tx+)

Blk - Excitation

- Excitation

- Excitation

- Excitation

Grn / 

Ylw

Case 

Ground

Case Ground

Case 

Ground

Case 

Ground

N/C indicates no connection

For alternate pinouts, please consult factory

PT-405 Series Supply Power Table

4-20 mA

0-5 / 0.5-4.5 / 1-5 VDC

0-10 VDC

RS-485

Power Supply

9-28 VDC

9-28 VDC

12.5-28 VDC

9-28 VDC

 

DANGER

: Incorrectly connecting your PT-405 Pressure Transmitter to your control system 

could result in injury or death.

 

IMPORTANT

: Incorrectly connecting your PT-405 Pressure Transmitter to explosion proof 

conduit, or using unapproved conduit, will void the protection rating of your PT-405.

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