If you are unable to find your solution in our troubleshooting guide, please send an e-mail outlining your problem to Ask The Expert. It will be sent to a UE Technical Representative who will contact you direct (make sure to include your phone and fax numbers). In the unlikely event the problem remains unresolved, instructions on returning the product to our factory Field Service group will be given over the phone.

Electromechanical Pressure and Vacuum Switches
Electromechanical Temperature Switches

 

Electromechanical Pressure and Vacuum Switches

Problem: Switch won't actuate

Possible Causes

Solution

Electrical: Is it wired correctly? Too much current-burned out switch? Dry circuit-too little current? Is a wire grounded? Is control head subjected to high temperature? Mechanical: Has set point changed? Plunger binds Malfunctioning pressure sensor Is plunger moving or is it depressed regardless of pressure exerted. Has control been over- pressurized so movement is distorted? Has sensor been subjected to corrosive media? Pivots binding

Electrical: Re-wire Substitute higher contact switch Substitute gold contact switch to minimize oxidation Re-wire Use hi-ambient switch Mechanical: Re-set Replace plunger Replace sensor Replace sensor Replace sensor and protect from over-pressure Use sensor that resists medium or use chemical seal Check control ambient & overpressures

Problem: Sensor is not operating-or is leaking medium fluid

Possible Causes	Solution
Over pressured beyond control specifications Is medium corrosive?	Replace sensor

Problem: Switch is chattering

Possible Causes	Solution
Vibration present? Pulses in pressure line?	Mount away from vibration or order 12 Series unit. Use pulsation dampener in line

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Electromechanical Temperature Switches

Problem: Switch won't actuate

Possible Causes

Solution

Electrical: Is it wired correctly? Too much current-burned out switch? Dry circuit-too little current? Is a wire grounded? Is control head subjected to high temperature? Mechanical: Has set point changed? Plunger binds Malfunctioning thermal assembly? Is plunder moving or is it depressed regardless of temperature at sensor. Does head of thermal assembly smell of chemicals or show liquid? Has control been over-temperatured so movement is distorted? Has capillary been crimped or cut? Has capillary or bulb or control head been attacked by corrosive medium or atmosphere? Pivots binding

Electrical: Re-wire Substitute higher contact switch Substitute gold contact switch to minimize oxidation Re-wire Use hi-ambient switch Mechanical: Re-set Replace plunger Replace thermal assembly Check control ambient & overpressures

Problem: Sensor is not operating-or is leaking medium fluid

Possible Causes	Solution
Over temperature beyond control specifications Is medium corrosive?	Replace sensor

Problem: Switch is chattering

Possible Causes	Solution
Vibration present?	Mount away from vibration.

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