1. INTRODUCTION
A high precision portable thermometer for metrology and other exacting laboratory
applications, the DP97 is a proven instrument used world wide as a laboratory and site
standard in pharmaceuticals, medical, food, environmental testing, R & D, and general
industrial applications. It is particularly suitable as the reference standard for
temperature calibration baths.
The DP97 Digital Thermometer utilises highly advanced microprocessor circuit design to
achieve exceptional measuring accuracy, linearisation conformity and stability in a
versatile but easy to use configuration.
Based on a high resolution 20 Bit Analogue to Digital Converter, all measurement
computations are performed digitally
without drift.
The 5 digit LED display provides a
readout to 0.01°C over the entire –199.99 to +849.99°C range; alternatively °F, Kelvin or
Ohms values can be displayed up to 999.99 units.
Single or dual Pt100 3 or 4 wire sensors are accepted; the DP97 will automatically
recognise and select 3 or 4 wire mode. Display of input A, B OR a-B (differential) can
be selected; a differential “zero function” allows sensor accuracy differences to be
eliminated for accurate differential readings.
An RS232 interface (remote control and measure) is fitted as standard and isolation is
incorporated. An analogue (retransmission) output is also fitted as standard; the 1V dc
output is programmable between lower and upper set limits.
Calibrated sensors can have their calibration points programmed into the DP97 via a
personal computer using Labfacility software. The instrument then digitally self
calibrates to the probe(s) providing corrected temperature readout to give optimum
system accuracy.
The non-volatile memory ensures permanent retention of the values until the user
wishes to re-programme using the software, preventing unauthorised personnel from
changing the values.
Primary power is provided by an internal, re-chargeable sealed lead-acid battery, which
provides in excess of 12 hours operation from a full charge. A mains adapter is
provided for re-charging and for operation directly from the mains.
A range of precision stainless steel sheath Pt100 probes is available for the DP97.
Page 1
