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Dew-Point Transmitter for Compressed Air Dryers - SF82

Updated:2025-03-13

Brand: PST/Michell
Model: SF82
Description: The SF82 is a fast-responding moisture sensor for control of dew-point and moisture content in compressed air dryers to maximize energy efficiency. Compressor rooms are often hot with temperatures rea
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Product Details

Dew-Point Transmitter for Compressed Air Dryers - SF82 Description：

Product Manual

Fast Response Moisture Meter with Multiple Process Connections.

Features

Dew point or ppmV moisture content output

Accuracy ±2 °C (±3.6 °F) dew point

MiniDIN 43650 C, M12 electrical connectors

Traceable 9-point calibration certificate

Modbus RTU over RS485 digital communication

4...20 mA 2 wire

Power supply 5...28 V DC

Ultra-fast response to moisture change

Low cost of ownership and easy maintenance with sensor exchange program

316 stainless steel sensor and sample blocks

5/8” UNF, 3/4” UNF, G 1/2” process connections

KF40 Glove Box flange

The SF82 is a fast-responding moisture sensor for control of dew-point and moisture content in compressed air dryers to maximize energy efficiency. Compressor rooms are often hot with temperatures reaching +50 °C (+122 °F). The SF82 is capable of reliably providing fast, accurate dew-point measurements down to -60 °C (-76 °F) dew point even in these challenging conditions.

The SF82 industrial transmitter incorporates the latest Process Sensing Technologies advanced thick-film polymer moisture sensing technology to provide fast, stable and repeatable humidity measurements for all dew-point dryer applications.

It is available with a range of process connections and electrical connectors for easy installation. SF82 dew-point transmitters are included in our service exchange program which reduces both downtime and the cost of maintenance.

Specification

	SF82 MiniDIN 43650 C	SF82 M12
Performance Specifications
Measurement Range	-60 °C...+60 °C (-76 °F...+140 °F) dew point
Accuracy	±2 °C (±3.6 °F) dew point*
Response Time	63% at room temperature at 1 bara (14.5 psia) -60 °C...-20 °C (-76 °F...-4 °F) dew point: 6 s -20 °C...-60 °C (-4 °F...-76 °F) dew point: 40 s
Repeatability	0.5°C (32.9 °F) dew point
Calibration	9-point calibration certificate traceable to national standards
Electrical Specifications
Output Signal	User configurable over range; 4...20 mA (2-wire connection, current source)	User configurable over range; 4...20 mA (2-wire connection, current source) Modbus RTU over RS485 digital communications
Moisture Output	Dew-point or moisture content
Temperature Output	Not available	Data via Modbus RTU
Analog Output Scaled Range 4...20 mA (Dew point)	-60 °C...+60 °C (-76 °F...+140 °F) dew point -50 °C...+50 °C (-58 °F...+122 °F) dew point -50 °C...+30 °C (-58 °F...+86 °F) dew point -80 °C...+20 °C (-112 °F...+68 °F) dew point -20 °C...+50 °C (-4 °F...+122 °F) dew point (Non standard ranges available on request)
Analog Output Scaled Range 4...20 mA (moisture content in gas)	0...24000 ppm_v (Non standard ranges available on request)
Supply Voltage	6.5...28 V DC	5...28 V DC
Load Resistance	Max 250 Ω @ 12 V (500 Ω @ 24 V)
Current Consumption	23 mA max	Analog only 23 mA max, Digital only 6 mA max
Electrical Safety	IEC61010-1, UL61010-1 & CAN/CSA C22.2 No. 61010	IEC61010-1, UL61010-1 & CAN/CSA C22.2 No. 61010 EN61373 Rail Rolling Stock EN50121-3-2:2016 Rail EMC/RFI
Operating Specifications
Operating Temperature	-20 °C...+60 °C (-4 °F...+140 °F)
Compensated Temperature Range	-20 °C...+50 °C (-4 °F...+122 °F)
Storage Temperature	-40 °C...+60 °C (-40 °F...+140 °F)
Maximum Operating Pressure	10 MPag (100 barg/1450.38 psig) maximum
Pressure Safety Rating	45 MPag (450 barg/6526.7 psig) maximum
Flow Rate	1...5 Nl/min mounted in standard sampling block; 0...10 m/sec direct insertion
Mechanical Specifications
Ingress Protection	IP66 in accordance with BS EN 60529 (current version); NEMA 4 ingress protection in accordance with NEMA 250 (current version)	IP65
Housing Material	316 stainless steel
Dimensions	L = 133 mm x ?45 mm (5.24” x ?1.77”) (with connector cable)	L = 156 mm x ?45 mm (6.14” x ?1.77”) (with connector cable)
Filter (Sensor Protection)	Standard: HMWPE <10 μm Optional: 316 stainless steel sintered guard <80 μm
Process Connection	5/8” 18 UNF 3/4” 16 UNF G1/2” BSP
KF40 Flange Accessories	Flange for 5/8” 18 UNF & 3/4” 16 UNF process connections
Weight	150 g (5.29 oz) (excluding connector cable)
Electrical Connections	MiniDIN 43650 form C	M12 5 pin (A coded)
Mating Electrical Connections	Mating connector supplied as standard Optional 0.8, 2, 5, 10 metre (2.62, 6.56, 16.4, 32.81 foot) MiniDIN connector/cable available	Optional 0.8 , 2, 5, 10 meter M12 A coded connector/cable available
Analog Output Diagnostic Conditions (factory programmed)	Sensor fault: 23 mA Under-range dew point: mA Over-range dew point: mA
NOTES * Over Compensated Temperature Range