Thermometer with switching contacts DKR 250

Bimetallic technical stem thermometer with switching contacts DKR 250 is intended for temperature measurement and automatic remote switch when set temperature is reached. DKR 250 is analog measuring device and one-pole mechanical switching appliance. It switches on and off current in phase wire of electric circuit.

Description

The thermometer is one unit. It consists from head and stem. Stem axis is perpendicular to dial. Control knob for setting of required temperature using the adjustable pointer is mounted in front glass.

Thermometer connection is made on terminal board located at the back of thermometer. The current load as shown on label must not be exceed. Therefore connection via auxiliary relay is used. Thermometer can be installed in both vertical and horizontal position. In some cases, especially at pressure bigger than 0,3 MPa for special installation, stem must be placed in thermometer well. Maximum pressure when well is used is 0,6 MPa. Wells are tested for pressure 0,9 MPa according to ČSN 130010. Thermometer wells are always 5 mm longer than thermometer stem. Well thread is M 20x1,5 and the spanner size s = 24 mm.

The whole measuring system must be placed in measured environment to ensure accurate measurement. Recommended installation depth P is at least 60 mm, or 80 mm for range 0-350 °C.

Thermometer DKR 250, maximal version
Adjustable pointer of maximal temperature is located to the right from contact pointer. When temperature raises, contact pointer moves closer to adjustable pointer. When switching temperature is reached, contacts are connected.

Thermometer DKR 250, minimal version
Adjustable pointer of minimal temperature is located to the left from contact pointer. When temperature lowers, contact pointer moves closer to adjustable pointer. When switching temperature is reached, contacts are connected.

Thermometer DKR must not be used as safety element.

Advantages

  • easy installation
  • load is connected directly to electrical network
  • easy setting or required temperature
  • easy and quick temperature reading 

Technical data

Version maximal, minimal
Maximal permissible deviation ±2,5 % from scale range
Rated working voltage 250 V
Minimal working voltage 24 V
Rated frequency 50 Hz
Rated working current 50 mA ~
Weight approx. 440 g
Protection IP 20
Connection flat cord H03VH-H 2x0,5 ČSN 34 7410-5 is recommended
Usage category ohmic load, auxiliary relay
Lifetime 10 000 of working cycles


  Scale range Scale division Stem length ... L [ mm ]
ø d = 8 mm (stainless steel (AKVS))
100 160 250 400
-20 to +40 °C     x x x x
+20 to +100  °C     x x x x
+20 to +180 °C     x x x x
+50 to +300 °C     x x x x

* If thermometer with range 0-450 °C or with stem length 630 or 1 000 mm (steel class 11, ø d = 12 mm) is required, please contact us.

Ordering

The order must include:
  • device type
  • version: maximal or minimal
  • quantity
  • scale range
  • stem length
  • accessory: thermometer well, adjustable thread socket

Dimensional drawings

Photos of the product

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