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RDS (Refrigerant Detection System) 

Flammable Gas Sensors

RDS R32

RDS R32 (Sense Air)

The RDS module is designed for detecting refrigerant leaks in mildly flammable refrigerants classified as A2L, including R32 and R454 A/B/C. The protective housing shields the sensor core from dust and water droplets, ensuring reliable operation. Additionally, it features an integrated heating element, enabling functionality even in cold environments.

The module supports the Modbus protocol, allowing measurement data to be transmitted to control systems. It also includes an additional output pin that activates a digital output signal when the detected gas concentration reaches a configurable threshold.  The output can be set to either a digital PWM signal or an analog linear output, providing flexibility in how the data is used.

RDS R32 RDS R32

Key features

  • High accuracy
  • Fast response
  • Wide operating temperature range
  • Compliant with IEC / UL 60335-2-40
  • Outstanding reliability and long service life
  • Built-in auto-calibration algorithm (ABC algorithm)
  • Available in 24V, 12V, and 5V versions
  • Easy to integrate with connector included

Specifications

Product name

RDS R32
Measured Gas R32, R454A, R454B, R454C
Product number

009-3-0007: 24V

009-3-0008: 12V

009-3-0009: 5V

Measurement range

0 - 50% LFL

Accuracy (*)

 ±2.5% LFL 

Response time (**)

<30s

Power supply

009-3-0007: 24V±10% VAC/DC

009-3-0008: 12V±10% VDC

009-3-0009: 5V±10% VDC
Output

Digital signal (High/Low or PWM) or Analogue voltage or

Analogue current.

Communication(***)

Modbus over RS-485

Dimensions

113 x 65 x 40 mm
Operation
Temprature range

-40 - 70℃

IP Rating

 IP66 ＆ IP67
Compliance with
IEC 60335-2-40 ed.7 

yes

Compliance with
UL 60335-2-40 ed.4
 		 yes

[Notes]

* 0 - 25%LFL and -30 - 60℃, After 3 ABC period or 1 zero calibration

** When exposed to R32 with concentration 25% LFL or higher, and Detection Threshold Limit Value set to 10% of LFL (default factory setting)

*** 009-3-0009 Senseair RDS R32 5V is hardware configured for UART communication and digital output (no RS-485 or analogue outputs are available on this variant)

About Senseair

Senseair, which became a member of the Asahi Kasei Microdevices (AKM) Group in 2018, is a provider of gas sensors using NDIR: Non-Dispersive InfraRed technology. Our goal is to constantly develop and mass-produce new gas sensor technologies.