Measuring range  -200°C up to 962°C (according to ITS-90)
 -200°C up to 850°C (according to DIN EN60751)
 Resolution  1 mK
 Measuring uncertainty  10 mK (optionally 5 mK in the range of -50 AC up to 250 AC)
 Measuring channels  2 (optionally up to 81 with external multiplexers)
 Sensors  Pt-100/Pt-25/Pt-10 in a four-conductor-technology
 Connectors  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
 Display  LCD, LED backlight, 2 lines ¨¤ 16 characters, 9 mm height
 Units   °C, °F, K, Ohm
 Interface  RS-232, isolated
 Operation  menu orientated, alternatively controllable by your PC
 Memory  128 KB (optionally 512 KB)
 Suppy  230 V, 50 Hz / 115 V, 60 Hz about 15 VA
 Size  260 x 80 x 240 (width x height x depth in mm)
 Weight  about 2,5 kg
 Technical data  The following specifications are only valid for a nominal
 operating voltage and a environmental temperature of 23AC.
 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
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DDM 900 Precision thermometer for Laboratory and Quality Assurance
The DDM 900 is designed for precise temperature measurements as demanded in calibration-laboratory use and quality assurance. For DDM 900-100/25 Pt-25- and Pt-100-Sensors can be used at the same time. For DDM 900-100/1000 Pt-100, Pt-500 and Pt-1000-Sensors can be used at the same time, too. Both versions are available with an integrated 8-channel-multiplexer as an option.
Product Description
Specification
Order Information
Main 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 thermovoltage
• Extensible up to 81 measuring channels
• True 4-wire-technique with Lemo-plugs
• High EMC
• High data reliability in terms of sensor coefficients
Delivery:
Model : DDM 900
 Order No                                   5020-0900               
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