JUMO STEAMtemp Steam-Tight Push-In RTD Thermometer

Steam-tight push-in Pt100 probe for sterilizers

The JUMO STEAMtemp (type 902830) is a push-in resistance thermometer in a steam-tight version, intended for temperature measurement in sterilizers and other pressurised atmospheres containing steam. It covers temperatures from -70 to +200 C and comes as a single, twin or triple Pt100 element in 2-, 3- or 4-wire circuit.

A flexible connecting cable in PTFE, FEP or silicone leaves the probe through a strain-relieved connection, and the cable ends can be bare, fitted with ferrules, receptacles or a multipole connector. The protection tube is 1.4571 stainless steel with 4, 4.5 or 6 mm diameter, and the version has IP69 protection. Type 902830/30 is pressure-tight up to 5.0 bar.

Technical specifications

Typical use

Sterilizers and autoclaves need probes that stay tight in steam, so the sheath and cable exit are made for pressurised, humid atmospheres. Laboratories and plant construction use the same probe where a thin, flexible sensor must be pushed into a small opening.

Order code groups cover the basic version, the cable type, the measuring insert, the tolerance class, the tube diameter, the fitting length, the cable end and the cable length, so the part number can be written precisely. The data sheet also lists stock versions with sales numbers, for example a 6 mm Class A probe with PTFE cable and 100 mm fitting length, which helps when a quick replacement is needed.

Specifying a probe

State the number of Pt100 elements and the circuit, because the 4.5 mm tube is offered for two measuring circuits in 4-wire. As a derived example, a validation loop with a redundant check sensor uses a twin Pt100 in 3-wire circuit.

The data sheet is an older edition (08.05), so confirm availability and the current order options before ordering. Also check that the maximum cable temperature is above your sterilisation cycle and that the cable end suits your connector. For validation work, ask whether a calibration certificate is needed, since the Class A tolerance of the Pt100 element is the starting point and a certificate documents the real deviation at your test points, for example at 121 C.

Documents and quotation

Quote requests are handled from this page: attach your tag list or the full code, and note the element count, cable type and fitting length. The attached PDF (JUMO STEAMtemp data sheet 902830 (EN)) is the reference for every value above, and it should be checked again for the final configuration. See also Temperature Instrumentation.