Consent Preferences

S287 Capacitance Type Liquid Level Switch - Flying Lead

Coolant Level Switch providing sink and/or source output. Fitted with flying leads and customer choice of suitable 3 or 4 pin connector.

The S285 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.

The switch is designed to operate in both earthed metal and isolated plastic tanks. For high accuracy the S285 is ideally 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
Troubleshooting Guide

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 Delphi Packard Metri-Pack 150 series connector.
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 D (sink) or Pin A (source).
Output state: Sink Open / Closed in liquid (factory set).
Source On / Off in liquid (factory set).
Connections: See diagram below.

Environmental Ratings

Ingress: IP67 (with mating connector fitted).
Max. pressure: 5.0 Bar (72 psi)
Max. pressure: 5.0 Bar (72 psi)
Weight: 70 g typical (dependent on thread size)
EMC: ISO13766:2006


Body: Brass.
Probe: PTFE.
Terminals: Brass, Tin Plated.
Seals: EPDM & 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.

Optional accessories

This switch can be supplied with any suitablemating plug or receptacle to suit customers’ applications.

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