Thermistor Pod
The Thermistor Pod is suitable for biological temperature measurements such as skin temperature measurements, nasal temperature and respiration detection. This unit is a compact signal conditioner designed to work with 10 k thermistors in the range 5 °C to 45 °C for biological temperature measurements. A delta temperature mode allows an offset to be applied so small changes in temperature can be observed.
Transducer Capability:
The following transducers are suitable for use with the Thermistor Pod:
• MLT409/A Skin Temperature Probe
• MLT415/A Nasal Temperature Probe
System Compatibility:
The Thermistor Pod connects to any PowerLab hardware units with Pod ports (8-pin DIN inputs). PowerLab and MacLab (except 4s, 8s and 16s) units without Pod ports requires the FE305 Pod Expander.
The Thermistor Pod is supported by the following versions of LabChart and Scope software:
WINDOWS
• LabChart v3.4.8 or later
• Scope v3.6.3 or later
MACINTOSH
• LabChart v3.6.3 or later
• Scope v3.6.3 or later
Note: Earlier software versions do not support Pods.
Theory of Operation:
The thermistor transducer is fitted as one element in a full bridge circuit. Changes in the resistance of the thermistor element are converted to a voltage which is amplified to produce 50 mV/°C within the temperature range 5°C to 50°C. A 3-pole 10 Hz lowpass filter reduces noise bandwidth. A switchable offset circuit is used to provide a delta temperature mode for relative temperature measurement.
Stacking and Unstacking Pods:
Pods stack by clicking into place on top of each other. To separate stacked Pods, push the top Pod towards the back and then pull them apart from the back.
| Specifications | 77-0038 | 77-0092 |
|---|---|---|
| Certifications | CE | *na |
| DC Drift | 3 µV/°C | See product page for complete specifications |
| Enclosure Size L x W x H Metric | 108 x 58 x 35 mm | *na |
| Input Connection Type | 3-pin mini audio connector | *na |
| Measurement Ranges | 5 °C to 45 °C in absolute mode, Δ1 °C to Δ20 °C in five ranges with Delta Temp on | *na |
| Model | ML309 | MLT415/A |
| Output Voltage | 50 mV/°C (0 mV = 25 °C) | *na |
| Package | 1 | 1 |
| Product Family | Data Acquisition | Data Acquisition |
| Response Time | ~200 ms (for a full scale change in temperature). Overall response will be dependent on the thermal response of thermistor probe | *na |
| Temperature Accuracy | ±0.2 °C absolute (25 °C to 45 °C) | *na |
| Temperature Offset Range | 50 °C overall (-5 °C to 45 °C absolute) | *na |
| Thermistor Type | 10 kΩ at 25 °C | *na |
| Weight Metric | ~200 g | *na |