Danfoss ETN Data sheet

Data Sheet

Temperature sensor

Type ETN

NTC temperature sensors for ETC & ERC controllers

For commercial refrigeration applications

Danfoss has selected a programme of temperature sensors to be used with the ETC and ERC range of controllers.

NTC (Negative Temperature Coe€cient) temperature sensors change resistance with temperature in a manner compatible with the controller software.

They are fully compliant with the tolerance requirements according to IEC 60060-1.

Features:

• High accuracy in temperature measurement and close tolerances ensure improved control

• Plastic/steel moulded sensor case

• Insulated connecting cable

• Various cable lengths available

• Supplied with rast 2.5 connectors

• Poka-yoke (mistake-proof) cable connection to the controller

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Temperature sensor, type ETN

Product speci€cation

Technical data

Table 1: PVC standard sensors

Double insulated
Operating temperature range	-40 – 80 °C
Thermistor	Encapsulated in plastic housing
Connecting cable	PVC double insulated
Climatic category (IEC 60068-1)	40/80/56
Rated resistance at 0 °C	16330 Ω ±2% (±0.4 °C)
Rated resistance at 25 °C	5000 Ω
Insulation resistance	>1000 MΩ
Voltage proof	3750 V
Thermal time constant	Approx. 35 sec.
Typical applications	Air sensing, evaporator sensing, condenser sensing

Table 2: TPE precision sensors

Double insulated

Operating temperature range	-20 – 100 °C
Thermistor	Encapsulated in plastic housing
Connecting cable	Thermoplastic elastomer double insulated
Climatic category (IEC 60068-1)	40/80/56
Rated resistance at 0 °C	16330 Ω ±1% (±0.2 °C)
Rated resistance at 25 °C	5000 Ω
Insulation resistance	>100 MΩ
Voltage proof	3750 V
Thermal time constant	Approx. 8 sec.
Typical applications	Ice bank

Table 3: NTC sensor for heating application

FEP insulation

Operating temperature range	-40 – 200 °C
Thermistor	Encapsulated in stainless steel housing. AISI 305
Connecting cable	Silicone rubber cable
Degree of protection	IP67
Rated resistance at 0 °C	346,9 kΩ (tolerance at 0 °C ±2.2%)
Rated resistance at 25 °C	100,0 kΩ (tolerance at 25 °C ±1.0%)
Insulation resistance	>100 MΩ
Voltage proof	3750 V
Thermal time constant	Approx. 8 sec.
Typical applications	Heating application

Connection diagram

Danfoss NTC temperature sensors are clearly marked for easy identification during the assembly process.

Colour coding on the cable close to the sensor element is used to differentiate between cabinet, evaporator (defrost) and condenser sensors even if the plug part of the cable is not visible.

For example, a sensor marked with two blue stripes as shown in Figure 2: Sensor with blue stripes is the evaporator or defrost sensor.

There are also different connector types or codes at the plug end of the cable. Using a combination of rib cuts on the connectors ensures correct connection position to the controller as shown in Figure 3: Connection position. This is known as Poka-Yoke design.

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