Technical Specifications:

• Input Type: J-type Thermocouple (JIS: Iron/Constantan, -210°C to +1200°C)
• Output Signal: 4–20 mA DC (2-wire system, FF1 configuration)
• Communication Protocol: HART 7 (FF1 configuration)
• Accuracy: ±0.1% of Span (at 25°C ambient)
• Temperature Drift: ±0.02% of Span per °C (0 to 50°C ambient range)
• Response Time (T63): ≤ 2 seconds (in still air, 1 m/s flow)
• Power Supply Voltage: 12 V DC to 42 V DC (2-wire loop powered)
• Load Resistance: Maximum 600 Ω (at 24 V DC supply)
• Operating Temperature Range: -40°C to +85°C (-40°F to +185°F)
• Ambient Temperature Effect: ±0.05% of Span per 10°C change
• Protection Rating: IP66 / NEMA 4X (aluminum housing, AM mounting)
• Approvals: ATEX, IECEx, FM, CSA, SIL 2 (IEC 61508)
• Dimensions (Transmitter Head): Approximately 70 mm (Ø) × 175 mm (L)
• Weight: Approximately 0.8 kg (with thermowell adapter)

Functional Features:

• HART 7 digital communication for remote configuration and diagnostics
• Input type auto-detection for thermocouple sensors
• Cold junction compensation (CJC) with accuracy of ±1°C
• Sensor break detection with configurable alarm output
• Loop current monitoring for wire fault detection
• Damping adjustable from 0.5 to 60 seconds
• Zero and span adjustment via HART communicator or local buttons

Structural Characteristics:

• Aluminum alloy housing (AM mounting) with epoxy coating
• Junction box for terminal connections (AM = aluminum junction box type)
• PG13.5 cable gland entry
• Intrinsically safe design for hazardous area installation

Working Principle:
The thermocouple generates a millivolt signal proportional to the temperature difference between the measuring junction and the reference (cold) junction. The transmitter measures the thermocouple voltage, applies cold junction compensation using an internal temperature sensor, linearizes the signal, and outputs a proportional 4–20 mA DC current. HART communication superimposes digital data on the analog signal using frequency-shift keying (FSK) at 1200/2200 Hz.

Advantages:

• High accuracy (±0.1%) suitable for precise process control
• HART communication enables remote diagnostics without process shutdown
• Robust aluminum construction for harsh industrial environments
• Wide ambient temperature range (-40°C to +85°C)
• SIL 2 certified for safety instrumented systems

Applicable Industries:

• Oil Refining and Petrochemical
• Chemical Processing
• Power Generation (Boiler, Turbine monitoring)
• Steel and Metals
• Food Processing

Installation Requirements:

• Mount the transmitter at the thermowell or directly in the process using AM-type junction box
• Use extension grade thermocouple wire matching J-type specifications
• Ensure proper cold junction compensation by keeping the terminal block at a stable temperature
• Maintain minimum 300 mm straight pipe run upstream of the thermowell for accurate flow measurement
• Ground the transmitter housing to the plant grounding system

Precautions:

• Verify thermocouple polarity before connection (positive/negative leads must match)
• Do not exceed the maximum process temperature of +850°C for J-type thermocouples (continuous use limited to +750°C per IEC 60584)
• Ensure the loop resistance does not exceed 600 Ω at the specified supply voltage
• Use shielded twisted-pair cable and ground the shield at the control system end only