JUMO Wtrans p Wireless Pressure Transmitter

Overview

JUMO Wtrans p is a battery-powered wireless pressure transmitter engineered for mobile and stationary pressure and level measurement wherever running a signal cable is impractical, costly, or impossible – including moving and rotating components. Operating on the license-free 868.4 MHz ISM band, the JUMO Wtrans p transmits measured values wirelessly up to 300 m to a JUMO Wtrans receiver, which makes the data available in digital form over RS485/Modbus and as standard electrical signals at its analog outputs.

With engineering support in Muscat, Seven Star LLC supplies the JUMO Wtrans p to process plants, mobile equipment operators, and instrumentation teams across Oman and the GCC. Customers purchasing through Seven Star LLC receive a formal quotation, the manufacturer datasheet, and technical support based in the Sultanate of Oman.

Measurement Principle

The JUMO Wtrans p measures pressure using a strain-gauge sensing element: applied pressure deforms a diaphragm bonded with strain-gauge resistors, and the resulting change in resistance is converted into a calibrated pressure value by the transmitter’s onboard electronics. Once digitized, the measured value is packaged with encoded transmitter identification and sent wirelessly at a configurable transmission interval – adjustable from 0.5 to 3600 seconds – to the paired JUMO Wtrans receiver, which can service up to 16 individual wireless transmitters simultaneously.

Because the entire measurement chain from sensing element to wireless radio module is self-contained within the transmitter body, the JUMO Wtrans p requires no signal wiring between the measurement point and the receiver, only the receiver’s own connection to downstream control or display equipment. Onboard battery status monitoring, transmitted alongside the pressure reading, lets operators track remaining battery life without needing to physically access the transmitter, which is particularly valuable when the device is mounted on hard-to-reach or rotating equipment.

Engineering Design of the JUMO Wtrans p

The JUMO Wtrans p is rated IP67 and built for the mechanical demands of mobile and rotating applications, with high vibration resistance and a sender-side operating temperature range of -30°C to +85°C. Process connection is available with any industrially common thread type, including NPT, UNF, and the JUMO PEKA process connection adapter system, the latter EHEDG-certified in conjunction with compatible threaded connectors for hygienic process applications.

Configuration is performed by connecting a laptop running JUMO’s setup program via a standard mini USB cable; once configured, process parameters can be conveniently transferred to other devices, and up to 40 value pairs can be entered for customer-specific linearization, either as a linear approximation or a fourth-order polynomial characteristic line. The device also supports an online chart function, allowing measured values to be graphically monitored and recorded directly on a connected computer during setup and commissioning.

Key Features

The JUMO Wtrans p combines robust wireless measurement with flexible configuration for demanding mobile and stationary applications. Key characteristics include:

• Measuring range from -1 to 600 bar relative pressure, or 0 to 25 bar absolute pressure.
• Wireless data transmission at 868.4 MHz over a range of up to 300 m to a JUMO Wtrans receiver.
• Configurable transmission interval from 0.5 to 3600 seconds to balance responsiveness and battery life.
• Customer-specific linearization with up to 40 value pairs (linear or fourth-order polynomial).
• IP67-rated housing with high vibration resistance for mobile and rotating equipment applications.
• Onboard battery status monitoring transmitted alongside the pressure measurement.
• Configuration via standard mini USB connection to a laptop running the JUMO setup program.

Receiver Architecture and System Integration

The JUMO Wtrans p forms one half of a two-part wireless measuring chain, and specifying the receiver correctly matters as much as selecting the transmitter itself. The JUMO Wtrans receiver is offered in two basic versions: type 902931/10 with four analog outputs, and type 902931/30 with two analog outputs plus two relay outputs rated up to 3 A at AC 230 V resistive load. Each analog output is individually configurable as 0(4) to 20 mA or 0 to 10 V with an output accuracy of ±0.1%, while an RS485 interface running Modbus at 9600, 19200, or 38400 baud with device addresses from 1 to 254 carries the digital values into a PLC or SCADA layer. The receiver is a DIN rail device (35 mm × 7.5 mm rail, IP20) powered from AC 110 to 240 V or AC/DC 20 to 30 V, with a two-line LC display and four function keys for local readout and configuration. Where a larger wireless installation is planned, the JUMO variTRON 300 automation system can take over the receiver role and handle up to 32 Wtrans sensors.

Radio Band Selection and Range Planning

The JUMO Wtrans p is supplied for the 868.4 MHz band used across Europe, with a 915 MHz variant covering North America, Australia, New Zealand, and selected other regions; the band is fixed at the point of order and must match the receiver. The published 300 m open-air range assumes the receiver antenna is fitted in its wall-mounting holder on a 3 m antenna cable rather than sitting directly on the enclosure, so antenna placement is in practice the single largest factor in the range achieved on a congested plant.

Industrial Applications

The JUMO Wtrans p is deployed wherever cable installation is impractical or prohibitively expensive, including mobile equipment, rotating machinery, hard-to-access plant locations, and temporary or retrofit measurement points where running new signal cable would require significant civil or electrical work. Typical applications span mobile hydraulic systems, rotating shafts and drums, remote tank or vessel monitoring, and pilot or trial installations where a full wired instrumentation loop is not yet justified.

Backed by manufacturer datasheet documentation, Seven Star LLC distributes the JUMO Wtrans p to oil field services companies, mobile equipment operators, and process industries throughout Oman and the wider GCC, including operations within the Sohar and Salalah economic zones. Regional customers benefit from technical support with wireless system selection and access to JUMO’s engineering documentation through Seven Star LLC’s technical instrumentation division.

Technical Specifications

The table below summarizes the core technical specifications of the JUMO Wtrans p wireless pressure transmitter.

Request a Quote for JUMO Wtrans p Wireless Pressure Transmitter

Seven Star LLC supplies the JUMO Wtrans p wireless pressure transmitter on request with regional technical support. Contact our instrumentation division for a formal RFQ, to check current availability and lead time, or to download the complete technical datasheet for project specification.Seven Star LLC supplies this item on request with the manufacturer documentation, and availability and lead time are confirmed at quotation.

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