Moore Industries TRY/PRG/4-20MA/10-30DC Temperature Transmitter – TRY/PRG Series

MOORE TRY/PRG/4-20MA/10-30DC – Programmable Temperature Transmitter in the Process Control Loop

The Moore Industries TRY/PRG/4-20MA/10-30DC is a two-wire, loop-powered temperature transmitter engineered for continuous signal conditioning in industrial process measurement. Operating on a 10–30 V DC supply and delivering a 4–20 mA output, this unit converts thermocouple and RTD sensor signals into a standardised current signal compatible with any analog input card, DCS marshalling panel, or PLC analog module without additional signal conversion hardware.

Within a closed control loop, the transmitter occupies the field-instrument tier: it receives a raw millivolt or resistance signal from the primary sensing element, applies linearisation and cold-junction compensation (for thermocouple inputs), and outputs a proportional 4–20 mA current that represents the measured temperature across the configured span. The PRG (programmable) designation indicates that input type, range, and output behaviour are configurable via Moore Industries’ field programming interface, eliminating the need for model-specific hardware variants across different sensor types.

The device is designed for head-mount or DIN rail installation, making it suitable for both field-mounted transmitter heads and centralised marshalling cabinets. Its compact footprint and wide supply voltage tolerance (10–30 V DC) allow direct integration into existing panel infrastructure without dedicated power conditioning.

Real-time Stock & RFQ: [email protected] | WhatsApp: +86 18359268345

Technical Parameters

Hardware Logical Analysis

The TRY/PRG/4-20MA/10-30DC is built around a microcontroller-based signal processing core that performs three sequential operations: analog front-end conditioning, digital linearisation, and current-loop drive.

Analog Front-End & Input Multiplexing: The input stage accepts millivolt-level thermocouple signals (typically 0–80 mV full scale) or low-resistance RTD bridge signals. A precision instrumentation amplifier with high common-mode rejection ratio (CMRR ≥ 100 dB) suppresses noise induced by long cable runs in electrically noisy plant environments. For thermocouple inputs, an on-board cold-junction compensation (CJC) sensor — typically a precision thermistor or bandgap reference — measures the terminal block temperature and applies a real-time offset correction, maintaining measurement accuracy independent of ambient temperature drift at the transmitter housing.

Galvanic Isolation Architecture: The input circuit is galvanically isolated from the 4–20 mA output loop. Isolation is implemented via a transformer-coupled DC/DC converter for power and an optocoupler or digital isolator for the signal path. This architecture breaks ground loops that would otherwise introduce measurement errors when the sensor and the control system share different ground potentials — a common condition in large plant installations where cable shields are grounded at multiple points.

Digital Linearisation & Span Calculation: Raw ADC counts are processed against IEC 60584 (thermocouple) or IEC 60751 (RTD) polynomial tables stored in non-volatile memory. The PRG interface allows the operator to define a custom zero and span, mapping any sub-range of the sensor’s physical range to the full 4–20 mA output. This sub-ranging capability improves effective resolution for narrow-span applications — for example, mapping a 50–150°C process window to the full 16 mA output swing rather than a 0–1000°C thermocouple range.

EMC Design: The PCB layout incorporates guard traces around high-impedance input nodes, ferrite bead filtering on the supply rail, and transient voltage suppression (TVS) diodes on the input terminals. These measures provide compliance with IEC 61000-4-2 (ESD), IEC 61000-4-4 (EFT/burst), and IEC 61000-4-6 (conducted RF immunity) — standard requirements for process instrumentation deployed near variable-frequency drives, contactors, and high-current bus bars.

Current Loop Driver: The output stage uses a precision voltage-to-current converter referenced to the loop supply. The circuit maintains output accuracy across the full 0–600 Ω load range at 24 V DC, with a maximum loop resistance determined by: R_max = (V_supply − V_min_transmitter) / 20 mA. At 24 V DC supply and a 10 V minimum transmitter operating voltage, the maximum loop resistance is 700 Ω — sufficient to drive standard 250 Ω HART resistors plus cable resistance without signal clipping.

System Integration Benefits

• Direct analog input compatibility: The 4–20 mA output maps directly to standard ±10 V or 0–10 V analog input cards via a 250–500 Ω shunt resistor, requiring no signal conversion module between the transmitter and the PLC/DCS analog input channel.
• Single-model flexibility across sensor types: The PRG programmability eliminates the need to stock separate transmitter models for J-type, K-type, and Pt100 inputs. One part number covers the majority of temperature measurement applications, reducing spare parts inventory complexity.
• Ground loop elimination: Galvanic isolation between input and output prevents ground loop currents from corrupting the 4–20 mA signal — a measurable source of offset error in multi-drop installations where sensor cables share conduit with power wiring.
• Deterministic signal latency: With a step response time below 500 ms, the transmitter introduces a predictable, bounded delay into the control loop. PID tuning parameters can account for this fixed lag without requiring empirical loop characterisation after transmitter replacement.
• Wide supply voltage tolerance: The 10–30 V DC operating range accommodates both 12 V and 24 V DC panel supplies without hardware modification, simplifying integration into mixed-voltage marshalling cabinets.
• Diagnostic transparency via loop current: A transmitter output of 3.6 mA (below the 4 mA live-zero) indicates a sensor break or input fault condition. This NAMUR NE43-compliant under-range signal allows the DCS or PLC to distinguish a genuine 4 mA process reading from a wiring or sensor failure, enabling automated fault alarming without additional discrete wiring.
• Reduced field wiring cost: Two-wire loop power eliminates the need for a separate power supply cable to the transmitter. The same two conductors carry both the DC supply current and the measurement signal, reducing cable count, conduit fill, and termination labour in field junction boxes.
• Long-term calibration stability: The microcontroller-based linearisation and the absence of mechanical trimming potentiometers mean calibration drift is governed by the stability of the voltage reference and ADC — typically <0.1% of span per year — reducing the frequency of scheduled calibration interventions in ISO 9001 or IEC 61511 maintenance programmes.

Quality Assurance & Global Logistics

Every TRY/PRG/4-20MA/10-30DC unit supplied by siemensplc.com is sourced as genuine Moore Industries OEM product. Units are not repackaged, relabelled, or modified. Physical inspection covers label integrity, housing finish, connector pin condition, and serial number format cross-referenced against Moore Industries’ part numbering conventions. Where bench testing is applicable, output signal linearity is verified using calibrated loop calibrators traceable to national measurement standards.

Shipments originate from our warehouse in Xiamen, China. Xiamen’s port infrastructure and proximity to major international freight hubs enable consistent transit times: DHL Express and FedEx International Priority typically deliver to Europe in 3–5 business days, to North America in 4–6 business days, and to Southeast Asia in 2–3 business days. All shipments include a commercial invoice, packing list, and certificate of origin. HS code classification and export documentation support are provided as standard for customs clearance.

In-stock units ship within 1–3 business days of order confirmation. A 12-month warranty against manufacturing defects applies from the date of shipment, subject to correct installation per Moore Industries’ installation instructions and operation within the specified environmental limits.

Contact Information

Email: [email protected]
WhatsApp: +86 18359268345
Web: siemensplc.com
Location: Xiamen, China
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