GM International D5091S

Technical & Electrical Specifications

• Power Supply Mode: 2-wire loop-powered, operating supply voltage range 12 VDC to 36 VDC
• Output Signal Standard: 4–20 mA DC linear analog loop signal, 4 mA corresponds to measurement lower limit, 20 mA corresponds to upper limit
• Supported Input Sensor Types: PT100 3-wire RTD, PT1000, K/T/J/R/S/B/N type thermocouples
• Temperature Measurement Range: PT100: -200 °C to +850 °C; K-type TC: -270 °C to +1370 °C
• Measurement Resolution: 0.01 °C digital internal sampling resolution, 0.1 °C final output resolution
• Intrinsic Safety Certification Marking: ATEX II 1G Ex ia IIC T6 Ga; IECEx Ex ia IIC T6
• Maximum Allowable Ambient Operating Temperature: -40 °C to +70 °C
• Transmitter Accuracy Grade: Class 0.1 high precision linearization accuracy
• Non-Volatile Storage: 8 kB EEPROM for permanent storage of sensor type, range offset and linear correction coefficients
• Electrical Connection Terminal: M20 × 1.5 threaded cable gland port, compatible with 6 mm to 12 mm outer diameter shielded instrumentation cable
• Enclosure Protection Rating: IP66 fully sealed die-cast aluminum housing
• Net Weight: 0.34 kg

Functional Features

1. Universal multi-sensor input hardware supporting all mainstream industrial RTD and thermocouple thermal sensors without hardware replacement
2. Automatic cold junction compensation circuit built-in for thermocouple measurement to eliminate ambient temperature drift error
3. Digital linearization algorithm corrects non-linear thermal resistance curve of PT100 and thermocouple sensing elements
4. Fault diagnostic signal output logic: fixed 3.6 mA under sensor open-circuit fault, fixed 22 mA under short-circuit fault
5. Non-volatile EEPROM retains all calibration parameters after complete power loss without reconfiguration requirement
6. Full intrinsic safety circuit design with built-in Zener barrier current/voltage limiting components to prevent spark generation in explosive atmosphere
7. Single-point field calibration support via handheld HART configurator tool without disassembly of transmitter enclosure

Working Principle

Material Composition

• Outer Enclosure: Low copper content die-cast aluminum alloy, anti-corrosion passivation coating
• Internal Circuit PCB: FR4 flame-retardant glass fiber substrate with gold-plated low-leakage signal traces
• Intrinsic Safety Components: Precision Zener diodes, wire-wound current-limiting resistors, ceramic safety capacitors
• Cable Gland Interface: Nickel-plated brass threaded M20 gland with NBR rubber compression sealing insert
• Internal Insulation Spacer: PTFE high-temperature non-conductive insulating partition separating signal and power circuits

Structural Characteristics

• Compact cylindrical monolithic IP66 sealed housing with integrated removable top calibration cover
• Single M20 threaded cable entry port positioned on bottom housing to prevent liquid ingress via gravity drainage
• Internal terminal block layout split into sensor input terminals and loop power/output terminals with physical insulating barrier
• Sealed silicone rubber gasket between main housing and calibration cover for full dust and water ingress resistance
• Mounting ear brackets integrated into housing body for direct pipe clamp or wall panel fixed installation

Advantage Highlights

1. ATEX/IECEx Zone 1 intrinsic safety certification eliminates extra flameproof junction box installation cost for hazardous area measurement points
2. Universal multi-sensor input hardware reduces spare part inventory quantity for mixed RTD/thermocouple measurement sites
3. Class 0.1 high measurement accuracy meets petrochemical precision process control standards
4. 2-wire loop-powered design cuts field wiring material and labor cost compared to 4-wire active transmitters
5. IP66 sealed aluminum housing resists rain, chemical splash and industrial dust accumulation outdoors
6. Fault current signal coding enables automatic fault identification by upper DCS monitoring system without on-site inspection
7. Wide -40 °C to +70 °C ambient operating range adapts to extreme cold outdoor refinery and desert chemical plant deployment

Applicable Industries

Installation Requirements

1. Mount transmitter on pipe wall or equipment bracket via integrated mounting lugs; maintain vertical installation orientation with cable gland port facing downward
2. Instrumentation cable must use shielded twisted pair; cable shield grounded only at DCS control room cabinet end, transmitter side shield floating
3. All field wiring connections sealed via certified ATEX M20 explosion-proof cable glands; unused cable ports sealed with solid explosion-proof blank plugs
4. Install intrinsic safety isolation barrier inside non-hazardous control cabinet on the loop power supply side
5. Maintain minimum 15 cm separation distance between transmitter wiring and high-current AC power cables in hazardous area cable trays

Usage Precautions

1. Strictly prohibit disassembly of transmitter housing while loop power is energized inside explosive hazardous zones
2. Do not replace internal circuit components with non-certified spare parts; intrinsic safety certification becomes void after unauthorized component modification
3. Conduct annual full range calibration with standard temperature bath equipment to maintain Class 0.1 measurement accuracy
4. Replace NBR cable gland sealing inserts every 24 months if deployed in chemical solvent splash environments to prevent seal degradation
5. Avoid mechanical impact on aluminum housing; housing deformation breaks IP66 sealing and invalidates explosion-proof rating