Technical Specifications:

• Input Type: J-type Thermocouple (JIS: Iron/Constantan)
• Input Range: -210°C to +1200°C (limited by thermocouple specification: typically -40°C to +750°C for continuous use)
• Output Signal: 4–20 mA DC (2-wire, A1 configuration)
• Communication Protocol: HART 7 (A2 configuration)
• Accuracy: ±0.1% of Span (at 25°C ambient)
• Temperature Drift: ±0.05% of Span per °C (0 to 50°C ambient)
• Response Time (T63): ≤ 1.5 seconds (in still air)
• Power Supply: 12 V DC to 42 V DC (2-wire loop powered, typical 24 V DC)
• Load Resistance: Maximum 600 Ω (at 24 V DC)
• Operating Temperature: -40°C to +85°C (-40°F to +185°F)
• Protection Rating: NEMA 4X / IP66 (/N configuration)
• Hazardous Area Approvals: ATEX Zone 1/2, Division 1/2, Class I, II, III
• SIL Rating: SIL 2 (IEC 61508)
• Approvals: FM, CSA, CE, EAC
• Dimensions (W × H × D): Approximately 80 mm (Ø) × 165 mm (L)
• Weight: Approximately 0.7 kg

Functional Features:

• HART 7 communication for remote configuration, calibration, and diagnostics
• Self-diagnostic function: sensor break detection, over-range indication, communication fault
• Input type auto-detection for thermocouples (J, K, T, E, R, S, B, N)
• Cold junction compensation (CJC) with ±1°C accuracy
• Programmable damping: 0.1 to 60 seconds
• Programmable output range via HART communicator
• Remote zero and span adjustment without process access

Structural Characteristics:

• Stainless steel (SUS316L) housing with NEMA 4X/IP66 rated enclosure
• PG21 cable gland for field wiring entry
• Intrinsically safe design (Ex ia IIC T4 Ga / Ex iaD 200°C)
• Wall-mount or pipe-mount installation option

Working Principle:
The J-type thermocouple generates a millivolt signal proportional to temperature. The transmitter measures this voltage, applies cold junction compensation using an internal precision temperature sensor, and linearizes the thermocouple characteristic curve using stored polynomial coefficients. The processed value is converted to a 4–20 mA DC output via a 16-bit D/A converter. HART communication uses FSK modulation (1200/2200 Hz) superimposed on the 4–20 mA signal for bidirectional digital data exchange.

Advantages:

• ±0.1% accuracy with excellent long-term stability
• NEMA 4X/IP66 enclosure — suitable for outdoor and washdown environments
• HART 7 enables full remote device management
• SIL 2 certified for safety instrumented functions
• Wide operating temperature range (-40°C to +85°C)

Applicable Industries:

• Oil and Gas (Refining, Pipeline, LNG)
• Chemical and Petrochemical
• Power Generation (Boiler, Steam, Turbine)
• Steel and Metals
• Food and Pharmaceutical

Installation Requirements:

• Mount using the pipe-mount bracket or wall-mount bracket (included)
• Use J-type thermocouple extension wire (JX or JIS grade)
• Keep the cable length under 100 m for best accuracy (or use compensated cable)
• Ground the transmitter housing to the plant grounding system
• Ensure the junction box is at a stable temperature for accurate CJC

Precautions:

• Verify thermocouple polarity — reversed polarity causes significant measurement error
• Do not expose the transmitter to temperatures exceeding +85°C ambient
• Maximum process temperature for J-type: +750°C continuous, +1200°C intermittent (max 1 hour)
• Ensure loop resistance ≤ 600 Ω at the operating voltage