RenKe RS-WD-*-2 Wall-Mounted “Wangzi” Enclosure Single-Channel Temperature Transmitter

Overview

The RenKe RS-WD-*-2 is a precision-engineered, single-channel temperature transmitter designed for reliable industrial process monitoring in demanding environments. Built around a high-stability thermistor or RTD sensing element—sourced from U.S.-based semiconductor suppliers—the device operates on the principle of analog signal conditioning: it converts resistance changes in the temperature-sensitive probe into standardized industrial output signals (4–20 mA, 0–5 V, or 0–10 V). Its core architecture integrates a dedicated analog signal processing circuit optimized for wide operating voltage (10–30 V DC), low power consumption (0.8 W), and robust electromagnetic compatibility. The transmitter is explicitly engineered for continuous outdoor deployment, with an IP65-rated “Wangzi” (character-style) wall-mount enclosure that provides mechanical protection and environmental sealing against dust and water ingress. This makes it suitable for unconditioned locations including telecom shelters, utility substations, HVAC ductwork, chilled water piping, and warehouse perimeter monitoring—where long-term drift, thermal shock, and electrical noise are persistent concerns.

Key Features

• IP65-rated wall-mount “Wangzi” enclosure—designed for permanent outdoor installation and resistance to UV exposure, rain, and condensation.
• High-accuracy sensing platform: ±0.5 °C typical accuracy at 25 °C, traceable to NIST-traceable calibration standards (calibration report available upon request).
• Multi-probe compatibility: Interchangeable probe options include stainless steel cylindrical, magnetic-surface, flat-contact, ½″ NPT threaded, and high-temperature variants—each rated for full immersion or surface contact per application requirements.
• Wide input voltage range (10–30 V DC) supports both 24 V DC control systems and legacy 12 V DC infrastructure; compatible with both 3-wire and 4-wire wiring configurations.
• Low-power analog circuitry ensures thermal stability across ambient temperatures from −40 °C to +60 °C, with long-term drift limited to ≤0.1 °C/year under continuous operation.
• Fast thermal response time (≤10 seconds at 1 m/s airflow) enables dynamic monitoring of transient temperature events in fluid lines or equipment surfaces.

Sample Compatibility & Compliance

The RS-WD-*-2 supports direct integration with standard industrial instrumentation without signal conditioning. Its analog outputs comply with IEC 61000-6-2 (immunity) and IEC 61000-6-4 (emissions) for industrial environments. While not certified to ATEX or IECEx, the unit meets general-purpose safety requirements for non-hazardous areas per GB/T 18268.21 (Chinese national standard equivalent to IEC 61326-2-1). Probe variants are constructed from 304 stainless steel and silicone-insulated high-temp cable (for 120 °C models), ensuring chemical resistance and mechanical durability in HVAC, food-grade storage, and light industrial settings. The device is compatible with data acquisition systems compliant with Modbus RTU (when used with optional signal converters), and its analog outputs interface directly with PLC analog input modules conforming to IEC 61131-2.

Software & Data Management

As a standalone analog transmitter, the RS-WD-*-2 does not incorporate embedded firmware, cloud connectivity, or local data logging. Its design prioritizes deterministic signal integrity over digital features—ensuring zero latency, no firmware update dependencies, and immunity to network-related failures. When integrated into SCADA or DCS platforms, the 4–20 mA or 0–10 V output supports full audit trail capability when paired with controllers compliant with FDA 21 CFR Part 11 (e.g., Siemens Desigo CC, Honeywell Experion PKS) via hardware timestamping and write-protected historian databases. Calibration records—including factory certificate of conformance and optional NIST-traceable calibration report—are provided as PDF deliverables for GLP/GMP documentation workflows.

Applications

• Continuous temperature monitoring of chilled/hot water supply lines in HVAC systems using threaded (½″ NPT) probe variants.
• Surface temperature surveillance of transformer enclosures, switchgear cabinets, and battery racks using magnetic or flat-contact probes.
• Environmental condition monitoring in telecom base station shelters and remote repeater huts exposed to wide diurnal temperature swings.
• Warehouse and cold-storage facility perimeter monitoring where wall-mounted, weatherproof transmitters eliminate conduit runs and junction box dependencies.
• Integration into OEM machinery for thermal feedback control loops—leveraging its stable 4–20 mA output for PID controller input in packaging, printing, and material handling equipment.

FAQ

What is the default temperature measurement range?
The standard probe configuration covers −40 °C to +80 °C. High-temperature variants (e.g., RS-WD-*-2-3H) extend the upper limit to +120 °C using PTFE-insulated high-temp cable.
Can the RS-WD-*-2 be powered by 12 V DC?
Yes—its 10–30 V DC input range supports 12 V DC, 24 V DC, and 30 V DC supplies. Note: 0–10 V output models require ≥22 V DC for full-scale linearity; 24 V DC is recommended.
Is the transmitter compatible with both 3-wire and 4-wire sensor connections?
Yes—the analog signal conditioning circuit accommodates either configuration without hardware modification. Wiring diagrams for both topologies are included in the installation manual.
How is field calibration performed?
The device is factory-calibrated and sealed. Field verification requires a reference thermometer (±0.1 °C accuracy) and milliamp/volt meter. Zero/span adjustment is not user-accessible; recalibration must be performed by an authorized RenKe service center.
Does the unit include a built-in display?
No—the RS-WD-*-2 is a display-less transmitter. For local readout, select the RS-WD-*-SMG variant, which integrates a 3-digit LED display with identical electrical and mechanical specifications.