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GN 650.5 Oil level indicators with electrical oil level and temperature monitoring


ELESA original design
code: HCX-E-ST

Product description


Oil level indicators GN 650.5 not only allow fluid levels to be inspected, they can also trigger an electric impulse once the oil level drops below a certain mark or if a certain temperature is reached.

The oil level is measured by means of a float with a magnet which makes or breaks a contact (REED switch) when the fluid minimum is reached.

The temperature is monitored via a sensor which makes or breaks a contact when a temperature of 80 °C is reached.

The polyamide body consists of two parts, welded with ultrasound.

Oil level indicators GN 650.5 can also be used in pressurised containers. Pressure test results regarding resistance under pressure are available.


Housing Plastic
crystal-clear Polyamide (PA -T)
  • ageing resistant
  • high mechanical strength
  • temperature resistant up to 90 °C
  • solvent resistant,
    but not suitable for alcohol
  • avoid contact with hot water

  • white lacquered
  • with 2 marking lines

Plastic, black

Rubber NBR (Perbunan®)

Set screw, hexagon nut, serrated lock washer
Steel, zinc plated, blue passivated


Technical drawing

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GN 650.5 Oil level indicators, oil level and temperature monitoring sketch

Article options / Table


NONormally open
NCNormally closed
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l1bdhkl2l3l4l5l6l7l8l9s ≈
wall thickness
12731M 1240502310116913252032,54312
25431M 1240502322829513252032,54312

Build & Price

Open 3D configurator
Distance of the screws l1

Electrical specifications

Oil level monitoring

max. switching voltage /
max. switched current:

150 Vac, 100 Vdc / 1 A (NO)
150 Vac, 150 Vdc / 2 A (NC)

max. switching capacity:

10 W (NO) / 20 W (NC)

Temperature monitoring

max. switching voltage /
max. switching current:

250 Vac / 10 A
48 Vdc / 5 A

Oil level and temperature monitoring

Connector plug:

DIN EN 175301-803 type C

Protection class:

IP 65

Cable gland:

PG 7, for cable Ø from 6 to 7 mm

Cable cross-section:

2 x 1,5 mm²

Caution: Magnet fields impair the proper function!

Drawing electrical specification GN 650.5

Assembly sequence for cable connection

Drawing Assembly sequence GN 650.5

1. Loosen the fixing screw and pull off the connector plug.

2. Push the contact holder out off the connector casing.

3. Loosen the cable gland, feed the cable through the connector casing and connect to the contact holder.

4. Push the contact holder back into the connector casing and tighten the cable gland for strain relief grip / seal.

5. Push the connecting plug over the contacts of the oil level indicator and secure with fixing screw.

Assembly instructions

Drawing Assembly instructions GN 650.5

Two tapped holes M12 are required for mounting the GN 650.5 oil level indicator. If nuts are used for mounting, two Ø 12.5 bore holes are required.

For the best possible sealing effect of the O-rings, do not overtighten the screws (max. 12 Nm). Recommended roughness of the sealing flange surface Ra = 3 μm.

Selected Part (How to order)

Total (net)
plus VAT 25,93 €
gross 188,00 €
In stock
Weight: 0,235 kg
If this article is new in our product range, it may happen that details concerning weight are as yet not listed.
If you do need weight details, please contact our Sales Department!
Phone+49 7723 6507 - 0
RoHS: Yes
This article is RoHS-compliant in application of Annex III., which means it complies with EU Directive 2011/65/EU, including extension (2015/863/EU), for restricting the use of certain hazardous substances in electrical and electronic devices. The Directive regulates the use of hazardous substances in devices and components. The implementation in national law is summarily described with RoHS(Restriction of (the use of certain) hazardous substances)).
Please note our quantity discounts.
With a total value (net) per order:
from 175,00 € -> 10 % discount
from 275,00 € -> 20 % discount
from 375,00 € -> 30 % discount
With a total value (net) per order:
All prices in accordance with our price list No. 52, valid from 1 May 2019, plus VAT only valid for Germany.

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