High and low temperature - PT probes and thermocouples

High and low temperature Efento sensors are suitable for measuring non-standard temperature values (from -200stC to 800stC). The temperature range that the device will support depends on the external probe used. The difference between the high temperature probe and the low temperature probe includes the insulation material of the cable. Efento high and low temperature sensors come pre-calibrated and the initial calibration is not required.

PT probes

PT sensor type

When the external probe needs to be changed this parameter enables choosing the type of probe used in the device.

• 0 - PT10 sensor

• 1 - PT50 sensor

• 2 - PT100 sensor

• 3 - PT200 sensor

• 4 - PT500 sensor

• 5 - PT1000 sensor

Sensor curve type

For each type of RTD (Resistance Temperature Detector) curve there is an equation that describes the relationship between resistance (R) and temperature (T) of RTD. The type of the curve depends on the material the probe is made of and is used for calculating temperature values ​​based on resistance.

• 0 - European standard

• 1 - American

• 2 - Japanese

• 3 - ITS 90

Excitation current

It is possible to configure the Excitation current in order to match the hardware to the selected probe type. The Excitation current values can be found in the technical documentation of LTC2983.

• 0 - 5 [uA]

• 1 - 10 [uA]

• 2 - 25 [uA]

• 3 - 50 [uA]

• 4 - 100 [uA]

• 5 - 250 [uA]

• 6 - 500 [uA]

• 7 - 1 [mA]

In the case of PT10 / PT1000 probes, the Excitation current value should be set depending on the connection type:

• 2-wire and 4-wire probes: 100uA

• 3-wire probes: 50uA

Once you set the new value of the excitation current, check the measurements taken by the device with the Efento mobile app. If the device reports a measurement error, reduce the Excitation current value by one level.

Extra delay multiplier

In case of additional capacities, caused by e.g. changing the RTD probe to a longer one, this parameter is responsible for changing the time required to compensate for the charging of the capacitors used in the measurement circuit (x * 100us)

• x = [0 : 255] - valid range of ED

Thermocouples

Thermocouple type

It is possible to configure the thermocouple type in the app, possible parameters are:

• Thermocouple_J

• Thermocouple_K

• Thermocouple_E

• Thermocouple_N

• Thermocouple_R

• Thermocouple_S

• Thermocouple_T

• Thermocouple_B

Open circuit current

It is possible to configure the open circuit current which is used to detect fault in thermocouple probes.

• 0 - 10 [uA]

• 1 - 100 [uA]

• 2 - 500 [uA]

• 3 - 1 [mA]

Sensor curve type

For each type of RTD (Resistance Temperature Detector) curve there is an equation that describes the relationship between resistance (R) and temperature (T) of RTD. The type of the curve depends on the material the probe is made of and is used for calculating temperature values ​​based on resistance.

• 0 - European standard

• 1 - American

• 2 - Japanese

• 3 - ITS 90

Excitation current

It is possible to configure the Excitation current in order to match the hardware to the selected probe type. The Excitation current values can be found in the technical documentation of LTC2983.

• 0 - 5 [uA]

• 1 - 10 [uA]

• 2 - 25 [uA]

• 3 - 50 [uA]

• 4 - 100 [uA]

• 5 - 250 [uA]

• 6 - 500 [uA]

• 7 - 1 [mA]

Once you set the new value of the excitation current, check the measurements taken by the device with the Efento mobile app. If the device reports a measurement error, reduce the Excitation current value by one level.