iWorX TM-100 User Manual

TM-100
Overview
The TM-100 Temperature Sensor is a sensor that can monitor temperatures
between 15°C above and 15°C below room temperature. The TM-100 is capable of
responding to changes in temperature within a few seconds because of its small
size (1mm x 3mm) and mass. The TM-100 is suitable for monitoring the
temperature of nasal airflow, changes in skin temperature that indicate evaporative
cooling, and changes in atmospheric temperature and temperature in
environmental chambers. Since the sensor element is water-resistant, the tip of the
TM-100 can be immersed in aqueous solutions, including saline solutions, for a
few hours.
How It Works
The sensor element in the TM-100 that responds to temperature changes is a
thermistor, which is a type of resistor that changes resistance with changes in
temperature. The thermistor in the TM-100 has a negative temperature coefficient
(NTC) which means that the resistance of the thermistor decreases as the
temperature goes up. Thermistors with positive temperature coefficients also exist.
Table 1 at the end of this Technical Note shows the resistances of the thermistor in
the TM-100 over a range of temperatures from 0°C to 50°C.
The thermistor in the TM-100 is wired into the circuit of the sensor as one leg of a
Wheatstone bridge. On the other three legs of the bridge circuit, selected resistors
are used to give the TM-100 a linear output over a range that is 15°C above and
below room temperature.
TM-100 Temperature Sensor
Technical
Note
iWorx Systems, Inc.
www.iworx.com
LabScribe is a trademark of
iWorx Systems, Inc.
©2015 iWorx Systems, Inc.

iWorX TM-100 Specifications

General

Brand	iWorX
Model	TM-100
Category	Temperature Controller
Language	English

Summary

TM-100 Sensor Overview and Functionality

Overview of the TM-100 Sensor

Details the TM-100 sensor's capabilities, size, mass, and suitability for various monitoring applications, including aqueous solutions.

How the TM-100 Sensor Works

Explains that the sensor uses a thermistor with a negative temperature coefficient (NTC) and is wired into a Wheatstone bridge circuit for linear output.

Using the TM-100 Temperature Sensor

Equipment Setup for TM-100

Instructions for connecting the TM-100 sensor to a DIN8 extension cable and then to an iWorx data acquisition unit.

Starting and Configuring LabScribe Software

Steps to open LabScribe, set channel preferences, name the channel, and configure sampling rate for the TM-100 sensor.

Calibration Procedure for TM-100

Detailed steps for calibrating the TM-100 sensor using two water temperatures (10°C and 40°C) and LabScribe software.

Operating the TM-100 Sensor Post-Calibration

Guidelines on using the calibrated sensor in aqueous solutions, its immersion limits, and cable extension capabilities.

TM-100 Sensor Applications and Care

Experiments Utilizing the TM-100 Sensor

Lists experiments, such as 'Metabolic and Thermal Response to Exercise', that use the TM-100 sensor within LabScribe.

Care and Maintenance of the TM-100 Sensor

Information on cleaning the sensor, noting its Teflon jacket and insulation can be cleaned with most cleaners.