TT-INFRA SENSOR

Thought Technology Ltd, Canada
Model: SA2500
  • TT-Infra monitors temperature without direct contact. It is generally used between .2”-1” (5-25 mm) from the surface to being measured.
  • Accuracy is +/-0.2 degrees C. Can also be used in combination with either the MyoScan or MyoScan-Pro sensor, which snaps to its back.

PRODUCT OVERVIEW

TT Infra Sensor togetherThe TT-Infra is a sensitive infrared temperature sensor designed for assessment of temperature variations over the skin. Scan both Temperature and SEMG Simultaneously by simply snapping a MyoScan SEMG sensor to the back of the TT-Infra sensor. Scan in half the time – or watch changes in both measures in real time.

SENSOR PLACEMENT

Temperature Control
The temperature of the examining room must be stable. The room must be draft-free, the doors and windows must be closed. Keep the instrumentation and the examinee away from heat, air conditioning and direct exposure to sunlight.

Preparing the instrumentation
Affix the electrodes on the two TT-Infra sensors, as shown:

TT Infra Sensor

Snap each MyoScan sensor (EMG) on top of the corresponding TT-Infra sensor, as shown:

Dual Sensors

Sensor placed on back

  • Put conductive electrode paste or cream on the EMG electrodes (grey area only).
  • Place the sensors on the examinee (on their back, for instance, as shown in the next photograph). Position your hands so that the electrodes remain stable and do not move. Apply gentle pressure on the sensor so that the 3 electrodes make good contact with the skin.

TECHNICAL SPECIFICATIONS

  • Size (approx.) : 368mm x 391mm x 145mm (1.45” x 1.54” x 0.57”)
  • Weight : 12.5g (0.44oz)
  • Temperature range : 19.80°C – 40.21°C (67.64°F – 104.38°F)
  • Absolute accuracy : ±0.5°C (±0.9°F)
  • Ambient operating temperature (for paired relative accuracy) : 21°C – 25°C (69.80°F – 77°F)
  • Paired relative accuracy : ±0.25°C (±0.45°F)
  • Measurement resolution : 0.02°C (±0.036°F)

INTERFACING WITH 3RD PARTY DATA ACQUISITION SYSTEMS

Recommended Connectivity for Electrical Safety

Thought Technology recommends the use of TT Sensor Isolator ST9405AM when interfacing patient connected sensor(s) to line powered equipment(s) or devices.

Ten20The TT Sensor Isolator ST9405AM is an interface device providing medical grade electrical isolation between the patient connected sensors and the acquisition system. It provides the equivalent of Two Means of Patient Protection under IEC 60601-1, and supplies battery power to the sensors. Using this device ensures Thought Technology sensors are safely interfaced to the analog inputs of line-powered systems such as computers with DAQ cards.

Note that this device isolates only between sensors and the DAQ interface, not between different sensor channels.

The TT Sensor Isolator can interface up to 4 sensors to a DAQ card. TT Sensor Isolator can be connected to the DAQ card in two ways:

  • via two stereo jacks, or
  • via a DB-15 connector; a BNC interface cable (SA9409BNC) or a pigtail cable (SA9409PGT) can be provided with the unit.

Graph

For more detailed information on the Sensor Isolator 4∞, consult the Thought Technology Science Division website or contact the sales department or your distributor.
Division website or contact the sales department or your distributor.

Direct Connectivity for Electrically Isolated Systems

The following notes are provided for qualified users to directly interface Thought Technology sensors with external systems.

WARNING: If the sensor is interfaced to non-Thought Technology devices without the use of a TT Sensor Isolator SE9405AM, an elevated risk of electrical shock may be present. In particular, if a patient-connected sensor is connected to any line powered device(s) or equipment(s), it will be the responsibility of the qualified user to ensure the electrical safety in the setup and to ensure that the device or equipment provides sufficient isolation.

To interface with a sensor, a single sensor cable may be cut in half. Both sides can then be used to make custom interfacing cables by stripping the outer insulation of each required conductor. The sensor cable contains 4 color coded conductors. The table below shows the color coding and pin connector assignment.

Pin Color Code Function Note
1 metal (shield) ground Signal and power ground, connection required.
2 yellow auxiliary (sensor ID) No connection required.
3 green signal Sensor output signal
4 red sensor power Supply voltage, +7.26V referenced to ground. Note: sensor performance may be sensitive to supply voltage.

Sensor Graph

Notes:

1. The nominal supply voltage for this sensor is 7.26V. The sensor can safely be used with a supply voltage of up to 9V.

Recommended Specifications for DAQ Hardware

  • Recommended resolution of 0.15mV (16-bit ADC over 10V span) or better
  • Minimum input range:
    • If connected via SE9405AM Sensor Isolator, choose 0-5V (unipolar) or ±5V (bipolar).
    • If directly connected to DAQ, choose ±5V (bipolar).

Simplified Transfer Function

Transfer FunctionTemperature in Celsius to output voltage in volts.

Transfer FunctionVoltage [V] conversion to temperature [ºC].

Transfer FunctionVoltage [V] conversion to temperature [ºF].