Q:  Do you have a signal alarm unit for a tank level application? I need it to meet the following requirements:

• Input signal accepts 4-20mA.
• Contacts opened or relay de-energized @ EL 208 ft.
• Equipped with up to four alarm trip relays.  
• Individually configured for: set point, high or low trip, normally open or normally close, failsafe or non-failsafe, and latching or non-latching.
• Deadbands adjustable over 100% of span.
• Output relay equipped with form C contacts rated at 10A, 120VAC.
• All operating parameters adjustable from the front panel keypad.
• Operate on a 120V 60 Hz power source.
• Capable of supplying 24V dc power to two-wire transmitters.

A: This is a perfect match for the Moore Industries SPA2 alarm trip unit.  The SPA2 can handle all of your above requirements, with an exception and a clarification.  Alarm set points for 208 feet should not be a problem assuming you have ranged your 4-20mA input to equal some engineering unit range of at least 208 feet, i.e. 4-20mA = 0-500 feet.  The exception is with the the form C relays on the SPA2.  They are rated for 5A, not 10A.  Therefore, if you need a 10A relay we recommend using an interposing relay in conjunction with the SPA2 outputs.  An example model number is: SPA2/HLPRG/4PRG/U [DIN]

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