Originally marketed as the Dymec DY-2800A
Operation of the DY-2800A and DY-2801A Quartz Thermometers is based on a new quartz crystal resonator which has a precisely linear frequency-to-temperature relationship. This frequency is measured digitally, using conventional electronic counter techniques.
The temperature range of the quartz thermometer is -40 to +230°C. Accuracy is equal to that previously found in high-quality platinum resistance thermometers, yet the instruments possess advantages common to digital devices: easy-to-read display directly in degrees C or F with simultaneous recorder electrical outputs. No bridge balancing is required, nor is reference to temperature conversion tables or curves.
The input has high immunity to electrical noise and cable resistance effects; sensing probes can be placed up to 1000 feet from the measuring instrument with full integrity of data; no reference junctions are required, and scanning devices are available to time-share multiple sensing probes.
The DY-2800A is equipped with one probe, measures over a fixed sample time and provides a 4-digit readout (optional 5 ) and recording output. Resolution is 0.1ºC or F (optionally 0.01º).