MEDTEQ has developed an 8 channel temperature measurement system specifically for measuring temperatures around the human body range, where low margins between the measured temperature and the allowable limit can demand a higher accuracy and resolution than standard laboratory equipment.
With a small sensor size, resolution of 0.001°C and an overall measurement uncertainty of 0.2°C over a range from 0 to 75°C, the Human Body Thermometry system (HBTS) is suitable for measurements of applied part temperatures (endoscopes, ultrasound probes, pulse oximetry and many others), and also for systems that control temperature such as infant incubators, infant radiant warmers, dialysis systems, humidifiers and more.
The sensor is an NTC thermistor (same type frequently used in medical systems), with a MEDTEQ developed system of special electronics and software to ensure highly accuracy of the range typically required for testing. During production, each sensor of the HBTS is individually calibrated to within 0.01°C against precision Pt100 probe in a circulating waterbath. Calibration coefficients are stored in the firmware of each unit.
The PC based software allows the user to view the plot of temperature with time, and stores the minimum, maximum and average values of temperature for each channel. Both the graph and data are easily copied for transfer into test reports or other test records.
In 2018 the unit was upgraded to HBTS 2.0, with individual 24 bit ADC for each channel, expanding the original 10-50°C range to 0-75°C, and increasing the resolution to 0.001°C. The new ADC also improved rejection of noise including 50/60Hz.
The system has the following key specifications (refer to the operation manual for more detail):
±0.2°C (10-50°C range)
±0.3°C (0-10°C and 50-75°C)
±0.05°C (e.g. temperature rise, measured by single channel, over time)
±0.1°C (e.g. temperature rise, measured between channels)
<20s (in air to within ±0.1°C)
Up to 10 hours
Current temp, min / max / average
Graph with easily adjustable time and temperature spans
easy to copy graph and table data to other applications (e.g. MS Word)
absolute and relative humidity indication (using selectable channels as dry/wet bulb)
save data to clipboard
Reduced channels (see pricing in Webstore)
Relay (e.g. for control of chambers)
ISO 80601-2-74 Annex FF sensors
Relative accuracy (time)
Relative accuracy (channels)
Length of leads