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The DDM 900 is designed for precise temperature measurements as demanded in calibration-laboratory use and quality assurance. The accuracy is adapted to the uncertainties of fix-point-cells for precise sensor calibrations. Pt 10-, Pt-25- and Pt 100-Sensors can be used at the same time. The resolution of up to 0,02 mK often is needed in physical and chemical laboratories.

Product features

• Accuracy: 5 mK
  • Resolution: 1 mK
  • Range: -220 °C to +1200 °C • Pt100, -25 and Pt10-Sensors
  • User defined coefficients for ITS 90 and EN60751
  • Fast measurements: up to 8/s
  • Excellent long-time stability
  • Compensation of self heating error
  • No impairment of the measurement results through parasitic thermo voltage
  • Extensible up to 81 measuring channels
  • True 4-wire-technique with Lemo-plugs
  • High EMC
  • High data reliability in terms of sensor coefficients

Available accessoires

- external multiplexers with 8 or 16 channels (up to 5 switches may be   cascade connected)
  - PC software for operation of instrument and measuring data acquisition
  - temperature sensors

Technical data

The following specifications are only valid for a nominal operating   voltage and a environmental temperature of 23°C.

Measuring range

-200°C up to 962°C (according to ITS-90)
  -200°C up to 850°C (according to DIN EN60751)


1 mK

Measuring uncertainty

10 mK (optionally 5 mK in the range of -50°C up to 250°C)

Measuring channels

2 (optionally up to 81 with external multiplexers)


Pt-100/Pt-25/Pt-10 in a four-conductor-technology


Lemo 1S, quadripolar, in front panel

Measuring current

about 0,5 mA switched DC (about 1 mA for Pt-25)

Measuring time

about 1 sec. per channel, about 0,1 sec. per channel with reduced   resolution

Long-term stability

5 mK / year

Temperature coeff.

1 mK/K


LCD, LED backlight, 2 lines 16 characters, 9 mm height


°C, °F, K, Ohm


RS-232, isolated


menu orientated, alternatively controllable by your PC


128 KB (optionally 512 KB)


230 V, 50 Hz / 115 V, 60 Hz about 15 VA


260 x 80 x 240 (width x height x depth in mm)


about 2,5 kg

Order No.



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Unit W4A
Ladytown Business Park
Co. Kildare
W91 XEX5

(00353) 045 408164