Original Instructions

September 26, 2023

p/n: 235396 Rev. A

S24 Dew Point Sensor

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S24 Features

The S24 Dew Point Sensor monitors compressed air quality to help prevent damage to equipment and manufactured goods.

Monitors dew point, humidity, and temperature in a compressed air system

Stainless steel housing with an integrated 1/2 NPT process connection

Provides serial data output for use in a control system

Installs in the main distribution line or downstream line

S24 Models

Model

Function

Connector

S24AS-D-MQP

Dew point sensor with Modbus

Process connection: One 1/2" Male NPT

12-inch cable with a molded 4-pin M12 quick disconnect connector

Configuration Instructions

Sensor Configuration Software

The Sensor Configuration Software offers an easy way to manage the sensor Modbus settings, retrieve data, and visually show sensor data.

The Sensor Configuration Software runs on any Windows machine and uses an adapter cable (BWA-UCT-900, p/n 19970) to connect the

sensor to the computer. 

Download the most recent version of the Sensor Configuration Software from the Banner Engineering website: https://

info.bannerengineering.com/cs/groups/public/documents/software/b_3128586.exe. 

S24 Modbus Registers

Sensor Data - Read Only

Sensor Address 

Description 

I/O Range 

Holding Register Registration 

Min Value 

Max Value 

Min (Dec) 

Max (Dec) 

40001 

Humidity (%RH) 

0 

100% 

0 

10000 

40002 

Temperature (°C) 

-1638.4 

1638.3 

-32768 

32767 

40003 

Temperature (°F) 

40004 

Dew Point (°C) 

40005 

Dew Point (°F) 

The temperature = (Modbus register value) ÷ 20. The humidity = (Holding register value) ÷ 100. The dew point = (Holding register value) ÷

100.

COMs Settings

Sensor Address 

 Description 

 I/O Range 

 Comments 

 Default 

 Access 

 40601 

 Baud Rate 

0 = 9.6k

1 = 19.2k

2 = 38.4k

0 = 9600

1 = 19200

2 = 38400

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© Banner Engineering Corp.