Brand: JUMO

JUMO 907032 Hygrostat for Room and Duct Humidity Control

Name: JUMO 907032 Hygrostat Humidity Controller | Seven Star LLC
Brand: JUMO
SKU: 907032

Description

Passive two-state hygrostat for indoor and air duct mounting

The JUMO 907032 series of hygrostats is built for simple two-state control of relative air humidity. They are offered in an indoor version (907032/10) and a duct version (907032/20), both with a potential-free change-over contact, and they need no supply voltage because they work in passive operation. The measuring element is maintenance-free when it is operated in normal clean ambient air.

The sensor is a hair-type element made of specially prepared plastic fibres that absorb moisture. The change in length is transferred through a lever system to a micro switch with a very small change-over path. The set value chosen with the rotary knob acts on the same lever, so the micro switch operates when the set humidity is reached.

The change-over contact can be used as an N/C or N/O contact, for humidification or dehumidification. The duct version is also available with a double change-over contact, where the second switching point is coupled to the first and can be set between 0 and 15 % relative humidity as a neutral zone.

The measuring element has good long-term stability because of a special aging process, so the regeneration known from older hair elements is not required. On the duct version the element can be cleaned with water, while the case head must stay dry.

Technical specifications

Parameter	Specification
Type	907032/10 indoor version; 907032/20 duct version
Sensing element	Plastic hair measuring element, hygrometric, water resistant
Scale range	30 to 100 % relative humidity; working and setting range 35 to 95 % RH
Hysteresis	About 4 % RH (micro switch, at 50 % RH)
Switching gap	0 to 15 % RH with two micro switches (duct version)
Accuracy at 23 °C	Indoor +/-3.0 % RH above 40 % RH, +/-5.0 % RH below 40 % RH; duct +/-3.5 % RH above 50 % RH, +/-4.0 % RH below
Temperature coefficient	Average -0.2 % RH/K at 20 °C and 50 % RH
Air speed	Indoor max. 15 m/s; duct max. 8 m/s, 15 m/s with wind protection
Response	About 1.5 min (t0.5 at 2 m/s); compensation time 20 to 40 min
Micro switch	AC 250 V; silver contact 0.1 to 5 A (dehumidification) or 0.1 to 2 A (humidification), up to 15 A on /202; gold contact AC 48 V, 1 to 100 mA
Operating life	100,000 switching cycles
Case / protection	Indoor PC case IP30D; duct ABS case with stainless steel probe IP54 (IP64 with internal set point)
Temperature	Ambient -30 to +60 °C; probe -40 to +80 °C; operating 0 to 60 °C
Weight	About 60 g (indoor), 700 g (duct)

Order code and options

The order code is the basic type, an output code and an extra code. Output 201 is one silver change-over contact at AC 250 V/5 A, 202 is one at AC 250 V/15 A, 203 is two silver change-over contacts with an adjustable switching gap, and 204 is one gold change-over contact at AC 48 V for 1 to 100 mA. Extra code 928 adds a covered, internal set point setter that almost excludes misadjustment.

Stock versions listed in the data sheet are 907032/10-201/000 (part 90/00556970), 907032/10-201/928 (90/00556971) and 907032/20-202/000 (90/00556972). Accessories include a stand, sun and rain protection sheath, wind protection sheath, PTFE filter tube, oval fastening flange and humidity probe checks for 33, 53 and 76 % RH for the duct version.

The datasheet is dated March 2011. Confirm current ordering details with us before you rely on a code.

The micro switch ratings depend on the load: a maximum of AC 250 V with 0.1 to 5 A at ohmic load for dehumidification and 0.1 to 2 A for humidification, 0.1 to 1 A at inductive load with cos phi 0.7, and a contact rating of 15 A at AC 230 V resistive on the 15 A version. Contact life is stated as 100,000 switching cycles.

Cable entry for the indoor version is through a rear opening, and for the duct version through an M20 x 1.5 cable screw connection. Terminals accept cable cross-sections up to 1.5 mm2. The duct probe tube should point vertically downward or horizontal, and the indoor ventilation slits should run at right angles to the air flow.

Applications and care

The manufacturer names conditioning cabinets, air ducts, humidifiers and dehumidifiers in building services, storage for foodstuffs, cold rooms for fruit and vegetables, glasshouses for garden centers, the textile, paper and print industry and hospitals. The duct version tolerates high moisture, even up to complete saturation, with a mild washing of the sensing element.

Choose the measuring location so that no condensate forms on or inside the device, particularly above 48 V. Below 48 V the controller can be used up to 100 % RH. Avoid direct sun, solvent aerosols and strong chemicals, and never dry the element with hot air.

The duct version is factory-set so that the second set point exceeds the first by 6 % RH on the two-contact type, and the neutral zone can be changed with a screwdriver after removing the lid, between 0 and 15 % RH. For checks on site, the duct version can be exposed to a humidity probe check and readjusted at the set screw on the probe tip.

Documents and quotation

The manufacturer data sheet (JUMO 907032 hygrostat data sheet (EN, 6 pages)) is attached to this page as a PDF. Send the full type code you need through the quotation form and we will reply with availability and delivery terms; please confirm the options against your plant specification before ordering. Related items are listed under Temperature Instrumentation.

Datasheets & Documents

Datasheet JUMO 907032 hygrostat data sheet (EN, 6 pages) Download

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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.