Explosion-proof Wireless Temperature Transmitter WZ4J-347B

I. Overview of the Explosion-Proof Wireless Temperature Transmitter WZ4J-347B

The wireless temperature transmitter manufactured by Puli Technology integrates a German‑imported Pt100 platinum resistance temperature sensor, a highly advanced and exceptionally stable Freescale ultra‑low‑power microprocessor, and a high‑precision sensor signal‑conditioning circuit, forming an intelligent temperature‑measurement instrument. On this basis, a wireless remote‑transmission module has been added, enabling the device to form a temperature‑acquisition system when paired with our smart wireless receiving terminal. This system departs from the conventional industrial practices of using RS‑485 or 4–20 mA current signaling and switching‑mode power supplies, instead adopting a 3.6 V lithium‑ion battery for power. As a result, installation is simplified, wiring costs are reduced, and genuine energy‑saving and environmentally friendly objectives are achieved. The product is widely employed in various industrial temperature‑measurement systems, such as those used in oilfields, power generation, petrochemical plants, and other applications where wiring is impractical.

1. System Design Philosophy

1) Greater Stability

Building on traditional designs, this wireless temperature transmitter incorporates high-quality components, a high-precision and reliable signal conditioning circuit, anti-interference circuitry, and both software and hardware compensation techniques. Extensive testing and experimentation have ensured that the instrument delivers accurate measurement data, strong anti-interference performance, and ease of operation.



2) Wireless Transmission

Conventional temperature transmitters typically feature a 4–20 mA output signal, with some also offering local display. Data must be transmitted via wired connections to the control room for collection, or field personnel must manually record readings on-site. However, due to harsh industrial environments—unstable power supplies, cable damage caused by maintenance activities, and cumbersome management—data acquisition often proves unreliable and inaccurate. This temperature transmitter leverages the world’s most advanced ultra‑low‑power wireless communication technology; its measurement and control instruments, as well as monitoring devices, operate in the 480 MHz open wireless frequency band. On‑site parameters—including data, alarms, and protection signals—are wirelessly and reliably transmitted to the control room, eliminating the need for manual on‑site meter reading and long‑distance wired transmission. This approach prioritizes user‑centric operation while achieving significant cost savings.



3) Energy-saving and environmentally friendly

Traditional temperature transmitters require AC or DC mains power; in contrast, this instrument employs the latest low‑power technology and is powered by a high‑capacity lithium battery. A single 3.6 V cell can reliably operate for more than one and a half years. The device eliminates the need to account for downstream load considerations and bypasses subsequent A/D conversion, directly wirelessly transmitting high‑precision measurement data to the receiving terminal in the control room, where it is then uploaded to the backend for centralized data management.

2. System Principle

ｉｎｓｅｒｔ the probe of this instrument into the pipeline. When the medium in the pipeline acts on the temperature-sensing element, causing it to heat up, the internal circuitry detects an electrical signal proportional to the process temperature. This signal is then precisely amplified and compensated by a linear amplification circuit, before being sent to the microprocessor for data measurement, processing, and display, and finally transmitted wirelessly to a remote terminal device.



3. Technical Parameters of Wireless Temperature Measurement

Explosion-proof Wireless Temperature Transmitter WZ4J-347B

1) Temperature measurement range: -50～300 (℃);

2) Power supply: a single 3.6V/13Ah lithium battery;

3) Accuracy: Class 0.2, 0.5, 1.0;

4) Display: five-digit LCD, clear display with no afterimage;

5) Overload: 150%FS;

6) Transmission distance: line-of-sight >500 meters;

7) Aluminum alloy housing, robust and corrosion-resistant;

8) Ambient temperature: -30℃ to +85℃;

9) Ambient humidity: < 95% RH;

10) Zero-point temperature drift: ±0.015%FS/°C;

11) Sensitivity temperature drift: ±0.015%/°C;

12) Applicable media: oils, gases, water, and other liquids;

13) Explosion-proof rating: ExdⅡBT4;

14) Frequency: Center frequency 480MHz;

15) Can be networked with the matching wireless receiver unit;

4. Application scenarios of wireless temperature transmitters

Application of wireless temperature transmitters in glass reaction vessels: The figure shows our company's 100L integrated high- and low-temperature unit and double-layer glass reaction vessel. The temperature-measuring instrument inside the reactor uses a non‑explosive‑proof wireless temperature transmitter, which can directly display the temperature on its meter head, transmit it remotely to a wireless receiver, and also connect to a terminal PLC for display and process control.