Consent Preferences

S283 Coolant Level Switch – Capacitance Type

Coolant Level Switch providing sink and/or source output. Fitted with Deutsch DT04-4P connector.

The S283 is an active device designed to give an alarm signal if liquid falls below, or rises above, a preset level. It can be specified with a delay to eliminate false alarms due to turbulence.

Containing a factory programmable microprocessor, the switch offers sink to ground or source voltage output. Its small footprint with limited intrusion into the tank means a reduced risk of damage and a wide range of customer specifiable options make it suitable for most applications.

For high accuracy, the S283 should ideally be mounted horizontally at the point where an alarm or control signal is required. However, the switch can be mounted vertically – contact Fozmula with your application requirements.

Data Sheet

Liquid types

Water based liquids, such as coolant or washer fluid, compatible with brass, PTFE, EPDM and FVMQ.

Electrical Rating

Supply voltage: 9-36 VDC.
Supply current: 7 mA + source output.
Max. load current: 1.0 A (sink) or 20 mA (source).
Alarm delay time: 0 to 25 s rising or falling (factory set).
Connection: 4 way Deutsch DT04-4P.
Power up delay: 0 to 10 s (factory set).
Power up state: ‘In Liquid’ or ‘Out of Liquid’ (factory set).
Output type: Sink (open collector) and/or Source (supply voltage).
Output pin: Pin 4 (sink) or Pin 3 (source).
Output state: Sink Open / Closed in liquid (factory set).
Source On / Off in liquid (factory set).


See diagram below

Optional accessories

C/K13: 4 way Deutsch DT06-4S mating connector kit to suit harness wire cross sectional area of 0.5 to 1.5 mm2 (16-20 AWG).

Environmental Ratings

Ingress: IP67 (with mating connector fitted).
Max. pressure: 5.0 Bar (72 psi)
Temp. range: -40 °C to +125 °C
Weight: 70 g typical (dependent on thread size)
EMC: ISO13766:2006


Body: Brass.
Probe: PTFE.
Max. load current: 1.0 A (sink) or 20 mA (source).
Terminals: Brass, Tin
Seals: FVMQ.
Connector: PA66 30% Glass Filled Nylon.
Thread sealant: Vibra-Seal 516 (taper thread variants only).
Vibration (15.3 Grms): 3 orthogonal planes for 3 hours per plane
Testing performed in accordance with BSEN 60068-2-64:1993
Drop: 1 m to concrete surface.

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