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KST RS 485 temperature converters

Reference GKST RS 485R

Converter type KST 485

Input signal Pt 1000/3850

RS 485 / MODBUS RTU output signal

Communication properties Communication via RS 485, maximum segment length is 1200 m, asynchronous transfer

preset transfer rate 9600 Bd optional transfer rate 1200, 2400, 4800, 9600, 19200, 57600, 115200 Bd - DIP switch

247 modules / 1 serial port

ModBus RTU protocol 1 stop bit, no parity

Measuring range -50 to 200 ° C

Power supply 10 to 35 V DC (not stabilized) 14 to 24 V AC

Power consumption max. 1 mW

Nominal supply voltage Un 24 VDC

Electronics accuracy 0,05%

Sensitive element accuracy

Resolution 0,01 ° C

Material of LEXAN boxes (complies with standard EN 45545-2)

Protection against ingress

KST: IP 65 according to EN 60529

MTTF average life * 1,95 x 106 h, based on a theoretical calculation

*) Under the environmental and operational conditions specified in the approved test methodology


Shock and vibration tests category 1, class B according to EN 61373

Electromagnetic compatibility according to EN 50121-3-2

Insulation test 1,5 kVDC for 1 minute according to EN 50155

Fire resistance according to EN 45545 (possible according to NFPA 130)

Product features KST RS 485 temperature converters

KST RS 485 - RS 485 temperature converters is intended to convert the signal from resistance type temperature sensing elements Pt 1000/3850 to digital RS 485 / MODBUS RTU signal. These converters can be used in any control system compatible with RS 485 digital output. The converter standard measuring ranges are -50 to 200 ° C. The operating temperature range is -40 ° C to 80 ° C. These limits should not be exceeded even for a short time.

The converters are designed to operate in a chemically non-aggressive environment.

KST RS 485 converter - the plastic housing is made of LEXAN material conforming to the requirements of EN 45545-2 and is identical, for example, to the connection head of KS 120 sensors. It is supplied with a wall bracket or with a clip for fixing on a DIN rail. The plastic housing meets the IP 65 protection requirements according to EN 60 529.


Type tests are carried out by a notified body according to standard EN 50155, as amended, Railway applications - Electronic equipment used on rolling stock, Art. 12.2.9, 12.2.11

- Electromagnetic compatibility according to EN 50121-3-2, as amended

- Insulation test according to EN 50155, as amended

- Shock and vibration tests according to EN 61373, as amended

The material of the plastic box and the PCB meets a set of requirements for R 24 materials according to Table 5 for the fire risk level HL1-HL2-HL3 of the standard EN 45545-2, as amended. . May be supplied with materials that meet NFPA 130 fire safety standard, as amended.

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