S273 – Capacitance Coolant Level Switch
Featuring an integrated Deutsch DT04-3P connector the S273 is a capacitance type liquid level switch for use in water-based liquids including engine and battery coolants. It is an active device designed to give an alarm signal if liquid falls below, or rises above, a preset level. It can also be specified with a delay to eliminate false alarms due to turbulence.
The switch is available with either sink to ground or source voltage output. A wide range of customer specifiable options make it suitable for most applications. For high accuracy, the S273 should ideally be mounted horizontally at the point where an alarm or control signal is required. However, the switch can be mounted vertically – contact Rocheste Sensors UK Limited with your application.
Documents
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.
Connection: 3-way Deutsch DT04-3P.
Power up delay*: 0 to 10 s.
Power up state*: ‘In Liquid’ or ‘Out of Liquid’.
Output type*: Sink (open collector) or Source (supply voltage less typically 2.7 V @ 10 mA).
Output state*: Sink Open / Closed in liquid.
Source On / Off in liquid.
Construction
Body: Brass or 316 Stainless Steel.
Probe: PTFE.
Terminals: Brass, Gold Plated.
Seals: EPDM & FVMQ.
Connector: 30% Glass Filled PBT.
Thread sealant: Applied to taper thread variants only.
Connections:
See diagrams.
Environmental Ratings
Ingress: IP67, IPX9K (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
Vibration: 3 orthogonal planes for 3 hours per plane
Testing performed in accordance with BSEN 60068-2-64:1993
Drop: 1 m to concrete surface.
