Brand: JUMO

JUMO hydroTRANS S20 Wall-Mount Humidity and Temperature Transmitter

Name: JUMO hydroTRANS S20 Humidity Transmitter | Seven Star LLC
Brand: JUMO
SKU: hydroTRANS S20

Description

Wall-mount humidity and temperature transmitter with optional CO2 module

The JUMO hydroTRANS S20 (type 907042) is a wall-mounted transmitter that monitors indoor and weather-proofed outdoor air for relative humidity and temperature, with an optional carbon dioxide (CO2) module. Three output families are offered: a configurable 4 to 20 mA / 0 to 10 V combination output, RS485 with Modbus RTU, and Single Pair Ethernet (SPE, 10BASE-T1L) with power over data line and Modbus TCP plus an integrated JUMO Cloud gateway.

A polycarbonate IP65 housing with an optional 1.77 inch TFT display, a micro-USB setup port and spring-cage terminals keeps installation simple. Beside the measured values, the device calculates dew point, frost point, wet-bulb temperature, absolute humidity, mixing ratio, partial water vapor pressure and specific enthalpy, so a PLC or building system gets psychrometric values without extra math.

Because the SPE version carries data and power over a single twisted pair for up to 500 m, a transmitter can be placed in a remote hall without separate mains or signal cables. It publishes through Modbus TCP and an integrated JUMO Cloud gateway.

Technical specifications

Parameter	Specification
Type	907042; basic type extension 11 (RH-T) or 12 (RH-T-CO2)
Relative humidity	0 to 100 % RH (0 to 95 % with CO2 module); typical +/-2.0 % RH, max. +/-2.5 % RH after 60 h stabilization; sampling 1 s
Temperature	-40 to +80 °C (-10 to +60 °C with CO2 module); typical +/-0.2 °C, max. +/-0.4 °C
CO2 (option)	400 to 10000 ppm; +/-(50 ppm + 5 % of measured value); sampling 30 s; default on SPE versions
Current / voltage output	4 to 20 mA (burden up to 500 Ohm, 0.1 %); 0 to 10 V (load at least 10 kOhm); both configurable
RS485	Modbus RTU; 9600 to 115200 baud; address 1 to 254; functional isolation
SPE	10BASE-T1L, 10 Mbit/s; Modbus TCP; PoDL class 11 (IEEE 802.3cg); M12 plug, IP67; cable up to 500 m
Supply	DC 24 V +/-33 % (analog) or -58 %/+33 % (RS485), SELV/PELV, max. 2.4 W; SPE: DC 18 to 30 V, max. 1.8 W
Display (option)	TFT 1.77 inch, 128 x 160 pixels, 11 brightness levels (extra code 994)
Ambient	-40 to +80 °C; with CO2 module -10 to +60 °C; with display -20 to +60 °C; climate class 3K24
Protection / altitude	Housing IP65; site altitude up to 5300 m
Vibration note	The CO2 module is vibration-sensitive; measurement may change under vibration
Housing / weight	Polycarbonate with PMMA display cover; approx. 200 g; M16 x 1.5 cable fitting for 4.5 to 10 mm cable
Approvals	Certificates for approved versions are provided on the manufacturer website; DNV via extra code 062 (not with CO2 or SPE)

Order code and calibration options

The order code runs: type 907042, extension (11 or 12), version 0, measuring range (15 for 0 to 100 % RH / -40 to +80 °C, 17 for 0 to 95 % RH / -10 to +60 °C / 10000 ppm), output (009 analog combination, 530 RS485 Modbus, 535 SPE with PoDL, only with display) and extra codes: 062 DNV, 775 DAkkS calibration service, 951 three-point DAkkS calibration at 20, 50 and 80 % RH at 23 °C, 952 two-point calibration, 994 integrated display. A sample is 907042/12-0-17-009/994.

Accessories include a USB cable, setup program, plastic sinter filter and membrane filter. Ask for the filter type when the air carries dust or condensation.

Pick the measuring range code to match the sensor option: code 15 gives the full 0 to 100 % RH and -40 to +80 °C range without CO2, while code 17 limits humidity to 95 % RH and temperature to -10 to +60 °C because of the CO2 module. Accuracy figures apply after a stabilization time of at least 60 hours following first start-up and at humidity of 30 % RH or above.

Where to use it

The S20 suits wall installation in warehouses, cold rooms, server and control rooms, switchgear rooms, HVAC plant rooms and sheltered outdoor locations. The data sheet lists a plastic sinter filter and a plastic membrane filter as accessories for dusty or damp air.

Use the analog output for older PLC cards, RS485 for a Modbus network of several units, and SPE where long cable runs with a single pair must also supply power. For CO2-based ventilation control, order the CO2 version and keep it away from vibrating surfaces such as fan housings.

For commissioning, connect a PC with the micro-B USB cable and the JUMO hydroTRANS setup program (00775170). Terminals are spring-cage type for 0.2 to 1.5 mm2 conductors, and the connected cables must tolerate at least 80 °C. The device must be fed from a limited-energy circuit as required by DIN EN IEC 61010-1:2020.

Because the housing is polycarbonate with IP65, the S20 can also be fitted in sheltered outdoor locations, but direct sun and splashing should be avoided. Allow the 60-hour stabilization period before judging the accuracy of a new installation.

Documents and quotation

This page carries the manufacturer PDF (JUMO hydroTRANS S20 data sheet 907042 (EN)) for checking dimensions and order codes. Use the quotation form to name the exact variant, options and delivery address, and we will answer with supply information. See also Temperature Instrumentation for similar instruments.

Datasheets & Documents

Datasheet JUMO hydroTRANS S20 data sheet 907042 (EN) Download

Reviews (0)

Reviews

There are no reviews yet.

How would you rate this product?

About brand

JUMO is the German maker of temperature sensors, process controllers, pressure transmitters and liquid analysis instruments. Moritz Kurt Juchheim founded it in Fulda in 1948 as M. K. Juchheim KG, making glass thermometers with six employees. The name JUMO comes from the founder's name. It is still a family company headquartered in Fulda, and the parent company has been called JUMO GmbH & Co. KG since 2003.

Seven Star LLC is an independent supplier in Muscat. We list JUMO RTD and thermocouple probes, thermowells, transmitters, controllers, recorders and water analysis instruments, and supply them to process plants, OEMs, HVAC contractors and water utilities in Oman and the GCC by type number.

JUMO company profile

Established	1948, Fulda, Germany, by Moritz Kurt Juchheim
First products	Glass and contact thermometers; platinum glass sensors from 1966
Ownership	Family-owned; renamed JUMO GmbH & Co. KG in 2003
Product families	RTD and thermocouple probes, thermowells, temperature and pressure transmitters, controllers and thermostats, safety temperature limiters, paperless recorders, liquid analysis and flow and level instruments

Milestones

1948: Moritz Kurt Juchheim founds M. K. Juchheim KG in Fulda, making glass thermometers with six employees.
1966: Platinum glass temperature sensors are added.
2003: The parent company is renamed JUMO GmbH & Co. KG.

JUMO products we list

Family	Models	Typical use
RTD and thermocouple probes	902020, 902030, 902050, 902120, 902006 2xPt100, PROCESStemp, mineral-insulated RTD, 901020 thermocouple, 901210, 902810 hygienic, 902550 surface, 902520 HVAC, MarineTemp	Temperature measurement in pipes, vessels, machines, HVAC and food plants
Thermowells and inserts	909710 thermowells, 909740 measuring inserts	Protecting sensors and replacing them without opening the process
Temperature transmitters	dTRANS T01, T03, T04, T05, T06 SIL, T07 HART, T09, T1000 IO-Link, DELOS T switch	Converting sensor signals to 4-20 mA, HART or IO-Link
Pressure and level	dTRANS p20, p30, p31 hygienic, p33 Ex, p02 DELTA, MIDAS S05, MIDAS DP10, DELOS S02, MAERA S25, NESOS R20	Pressure in process, hydraulic and OEM systems; tank and well level
Controllers, limiters and recorders	DICON touch, IMAGO 500, dTRON 316, iTRON, cTRON, diraTRON 104, eTRON T, safetyM STB/STW, safetyM TB/TW, LOGOSCREEN 601, mTRON T	Furnace, oven and process control, over-temperature protection and recording
Liquid analysis and flow	AQUIS touch S, AQUIS touch P, AQUIS 500 pH, AQUIS 500 CR, dTRANS pH 02, pH electrode, digiLine DO, ecoLine NTU, flowTRANS MAG H20, flowTRANS US W01	pH, conductivity, oxygen and turbidity in water treatment; liquid flow

Choosing a temperature sensor starts with the range and accuracy. A Pt100 RTD is accurate and stable from about -200 to 600 °C and is the usual choice in process plants. A thermocouple (type K or J, for example) covers much higher temperatures and responds faster but is less accurate. The wiring also matters: a 3-wire or 4-wire Pt100 connection cancels the resistance of the cable, while a 2-wire connection adds an error that grows with cable length. That is why a head-mounted transmitter is often fitted close to the sensor.

Where JUMO products are used

In Oman and the GCC, JUMO sensors and controllers are used in oil and gas and chemical plants, food and beverage production, plastics and metal heat treatment, HVAC and district cooling, water and wastewater treatment, swimming pools and marine applications.

Ordering JUMO products: what we need

Send the JUMO type number and the full order code from the label (for example 902020/10-...). For probes, add the sensor type (Pt100, Pt1000, type K or J), the number of wires, the insertion length and diameter, and the process connection. For controllers, add the input, outputs and supply voltage.

Facts checked against JUMO's company history, October 2026.

Browse JUMO products by category: Temperature Instrumentation, Pressure Instrumentation, Liquid Analysis Sensors, Controllers & Data Acquisition, Level Transmitter.