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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