TEMPERATURE SENSORS


Most of our meters are sold in standard set with the standard temperature sensors (CT2B-121) they have a platinum resistor which measures the temperature (Pt-1000B). This type of sensor is characterised by a good accuracy in comparison with sensors based on other solutions. A bit longer stabilisation time is compensated be a good accuracy.
In case when higher accuracy is required we offer sensors with resistors characterised by lower error, this are Pt-1000A or Pt-1000S resistors.



Meters of series: Type of the sensor Resistor Accuracy of the sensor
in the range 0÷100 °C
411, 401, 502, 505, 511 CT2B-121 Pt1000B 0.8 °C
411, 401, 502, 505, 511
on special order
CT2A-121 Pt1000A 0.35 °C
461, 601, 705, PT-411 CT2S-121 Pt1000S 0.27 °C
PT-401 - precise thermometer CT1U-143 Pt100 1/10 DIN 0.08 °C


Description of the sensors:
CT2B-121, CT2A-121, CT2S-121




The acceptable errors of the sensors

Sensors with Pt1000B resistor in the temperature of 0 °C ±0.3 °C
In other temperatures the error increases according to the following formula ±(0.3 °C + 0.005t)
whre t - temperature of the measured solution.
In the 100 °C temperature the acceptable error will be accordingly 0.8 °C.

With the Pt1000A resistor in the temperature of 0 °C ±0.15 °C.
In other temperatures the error increases according to the following formula ±(0.15°C +0.002t)
whre t - temperature of the measured solution.
In the 100 °C temperature the acceptable error will be accordingly 0.35 °C.

With the Pt1000S resistor in the range 0 ÷ 100 °C ±0.27 °C.
In other temperatures the error increases according to this same formula as for the Pt-1000B resistor.
In practice beyound the 0 ÷ 100 °C range the selectioned resistor has a higher accuracy than this calculated from the formula.

The Pt100 1/10 DIN sensor has the accuracy ±0.03 °C in 0 °C and ±0.08 °C in 100 °C.

The formulas concern both temperatures below and above 0 °C in the whole measuring range of the sensors.
Taking the maximal error for making the corrections may result in a higher error than in reality, because errors of individual resistors may vary.

We have observed resistors with errors lower than those given in the technical data, for example Pt1000B with an error in the range 0 ÷ 100 °C ±0.1 °C.
If there is a need of precise determination of the sensor's error the only possibility is to order its controlling in the appropriate laboratory.