FPS^® Electronic Boiler Water Level Indication

The Single Probe Alarm Module is an accurate and reliable instrument that provides positive indication of steam or water in high temperature and pressure applications. The Single Probe Alarm Module measures resistance and reports the presence of either steam or water, based on fluid conductivity. The probe can be mounted in a column or a 1-½ in. tee. The Swagelok®metal-to-metal seal assures a leak-proof installation with no moving parts. The Single Probe Alarm Module is an effective electronic replacement for mechanical float switches. The electronic unit can be conveniently located up to 65 feet away from the probe with low conductivity water and 500 feet away with high conductivity water. Two Form-C contacts provide relay outputs for control circuits. LEDs indicate “WATER” or “STEAM” and a third LED flashes for “POWER/CLOCK”, to show that power is present and the clock is properly functioning.

The Aquarian^® 1000Plus is configured with 1 to 4 independent probe channels, redundant power supplies, continuity, level fault monitoring and optional 4-20mA output. Each level relay output is rated at 5A which enables this system to serve as a trip, alarm or on-off control device.

Measuring the difference in resistance between high purity water and steam, the Aquarian 1000Plus is commonly used on feedwater heaters, piping and drains, main steam header drains, hot/cold reheat drains, and main boiler high/low alarm/trip.

The failure mode of this system makes the Aquarian 1000Plus very popular on turbine drain systems for turbine water induction protection (TWIP).

The Aquarian 3000Mini^® is a multi-probe system with solid-state electronics in a stainless steel enclosure, capable of operating up to three two-color remote displays, customized for the number of probes and their locations. Applications for the Aquarian 3000Mini water level indicator include: boiler steam drum, feedwater heater and deaerator. Standard features include: redundant power supplies, clock fault detection of the ±5VDC circuit, three-way adjustment for water conductivity, 5A power relays for level fault, and 5A power relay contact output for electronic fault.

Aquarian electronic level products were specifically designed to meet industry’s growing needs and demands for a reliable, cost-effective and versatile means of sensing water levels in a variety of high and low pressure applications. By passing a square wave ±5VDC voltage through the network and processing the resulting signal, a distinction between steam and water is made, even in water conductivities as low as 0.5 micromho.

The Aquarian Probe is a swaged-style high-pressure brazed probe which does not require gaskets for sealing and comes with a 2-year warranty and a 5 to 10 year life span. Rated for 3000 psi max, 1200 F max, the probe is designed to prevent water wicking. Each Aquarian probe is 100% nitrogen gas tested and hydro tested to 6000 psi.