4140 - Temperature / Pressure Switch

Features

●SET POINT INDICATION
Set point level clearly indicated on scale plate.

●VIBRATION RESISTANT
Robustly constructed microswitches permit switch installation on motors, diesels, compressors, etc.

●PRECISION
Well established and long proven temperature sensing methods enable precise and reliable operation largely u d by change in ambient temperature.

●WEATHERPROOF
Operation unaffected by salt air atmosphere, humidity or water spray.

●MARINE USE APPROVED

Type approval certification available. (Capillary version pending)

MARINE CLASSIFICATION
Pressure ranges 1, 2, 3, 4 & 9
Temperature ranges 1, 2, 3, 4 & 5
Microswitch types K, R, S & Y have been Type Approved for marine applications by:-Lloyds Register of Shipping Det Norsk Veritas Bureau Veritas Germanische Lloyd

(Model 4140D only) Polish Register of Shipping USSR Register of Shipping R.I.N.A.

NB: In accordance with the Classification Societies Rules a Thermowell must be used on all Temperature Switch installations for liquid sensing, in marine applications.

Specifications

Housing: Diecast aluminum alloy casting with high resistance to corrosion. Removable covers at front and rear for easy access to set point adjustment and microswitch terminals. Fully gasketed and weatherproof to IP56.

Vibration: Vibration resistant up to 4G/100Hz for K type microswitch and up to 14G/100Hz for type R microswitch (reset differential higher than for type K).

Ambient Temperature: Suitable for installation in ambient temperature of -15 to +120 C (+5 to +248 F). The set point varies by less than 1% for a variation of 0 - 80 o C (32 - 176 F) of ambient temperature.

Finish: Standard finish is dark blue enamel paint. For installations where salt air corrosion is anticipated, a corrosion protection finish (i.e., aluminum parts anodized before painting) can be provided.

Set point indication : All switches are equipped with a scale plate, calibrated in o C or BAR, appropriate to the range specified. On 2-step switches the scale plate indicates set point level of the 1st set point only.

Pressure Sensing: Nitrile rubber diaphragm ( BUNA-N ) with support ring fitted to aluminum or aluminum bronze pressure chamber. Maximum permitted temperature, 90 o C ( 194 F ). Suitable for oil, water, air and gas sensing. When sensing sea water pressure, specify corrosion protected model which provides for an aluminum bronze pressure bonnet.

Manual Override: Optional feature. (Model 4140C & A only ) A manually operated push-button can be provided to mechanically override the setpoint during equipment start-up operations. When start-up is achieved, sensed pressure when slightly above the pressure setpoint, releases the override allowing the switch to function normally if pressure fails.