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SF82-TX
SF82 Transmitter 2-Wire
- Dew point or ppmV moisture content output
- Accuracy ±2 °C (±3.6 °F) dew point
- MiniDIN 43650 C, M12 electrical connectors
Product Overview
- Applications Compressed air Class 1 to 6 Dryers, Breathing air, Hydrogen coolant, Inert and bulk gases, Glove boxes, Welding gases, Hazardous areas, Oxygen purity, Air, Air Dryers, Clean Rooms, Compressor Control, Gases, Laboratories, Laboratories and Scientific, Materials and Surfaces, Medical Equipment, Specialty Equipment
- Compensated Temperature, Max 50 °C
- Compensated Temperature, Min -20 °C
- Compliance Note IEC61010-1, UL61010-1 & CAN/CSA C22.2 No. 61010 EN61373 Rail Rolling Stock EN50121-3-2: 2016 Rail EMC/RFI
- Dimensions Note L = 156 mm x ø45 mm (6.14” x ø1.77”) (with connector cable)
- Electrical Output 4 to 20 mA
- Flow Rate Note 1 to 5 Nl/min mounted in standard sampling block; 0 to 10 m/sec direct insertion
- Height 133 mm
- Housing Material 316 Stainless Steel
- Length 45 mm
- Load Resistance Max 250 Ω @ 12 V (500 Ω @ 24 V)
- Operating Pressure, Max 10 MPa
- Operating Temperature, Max 60 °C
- Operating Temperature, Min -20 °C
- Proof Pressure Up to 6526.7 psi
- Sensor Filter 10 µm standard HMWPE guard
- Series ID SF82-TX
- Storage Temperature, Max 60 °C
- Storage Temperature, Min -40 °C
- Supply Current 23 mA
Supported Applications
The Michell SF82 Transmitter is a rugged, two-wire dew-point transmitter designed for the continuous measurement of moisture content in gases. The series is engineered specifically for industrial dryer applications requiring precise humidity monitoring.
Suitable media include non-corrosive gases, clean dry air, and inert gases. The device measures dew point directly to determine gas moisture levels within specified operating envelopes.
Operating Conditions & Performance
The SF82 series operates across a measurement range of -60 to +20 °C (-76 to +68 °F). Accuracy is rated at ±0.5 °C (±0.9 °F) with repeatability of ±0.2 °C and resolution of 0.1 °C. The response time (T90) is less than 10 seconds.
Process and ambient operating temperatures range from -40 to +85 °C, matching the storage temperature limits. The transmitter supports a pressure rating of 0 to 10 bar with a burst pressure limit of 100 bar. It maintains an IP67 enclosure rating and withstands vibration up to 10–500 Hz at 1.5 mm amplitude and shock loads of 100 g for 11 ms.
Electrical requirements include a power supply of 12–30 VDC with a maximum load resistance of 500 Ω. The device carries CE and FCC Part 15 approvals.
Configuration Options
The SF82-TX series offers configurable process connections, measurement ranges, electrical interfaces, and protective options to accommodate specific installation requirements.
- Process Connections: Available in G1/2" BSPP, 3/4" - 16 UNF, or 5/8" 18 UNF threads.
- Measurement Ranges: Standard scaled ranges include -60/+60°Cdp, -50/+50°Cdp, -50/+30°Cdp, -80/+20°Cdp, and -20/+50°Cdp. Non-standard measurement ranges are available upon request.
- Output Signals: Configurable for 4–20 mA analog output or RS485 / Modbus RTU digital communication (enabled via M12 connector selection).
- Electrical Connectors: Options include MiniDIN 43650 or M12 5 Pin connectors. Note that the mating connector is not supplied and must be ordered separately.
- Protection: Standard configuration includes an HMWPE guard for protection against fine particulates (<10 μm).
The series supports various accessories including sample blocks, sampling kits (atmospheric or high pressure), PTFE tubing, and replacement parts such as sensor elements and connector assemblies.
Key Product Differences
Variants within the SF82-TX family are distinguished by their process connection type, selected measurement range, electrical interface, and protective guard configuration. The model number structure follows the format SF82 - TX - Type - Range - Protection - Electrical Connector.
- Process connections vary between G1/2" BSP (Type A), 3/4" UNF (Type B), and 5/8" UNF (Type C).
- Measurement ranges are selected via codes corresponding to specific scaled outputs, such as -60/+60°Cdp or non-standard ppmV conversions.
- The electrical connector choice determines signal capability: MiniDIN 43650 supports standard analog output, while the M12 5 Pin option enables both 4–20 mA and Modbus RTU over RS485 outputs.
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