The Level Pulse Control System is a pulse-width modulating system that modulates the flow of liquid to control liquid level, provides a uniform supply of makeup liquid, and most importantly, minimizes fluctuations in vessel pressure. The LPS incorporates a sophisticated Auto-tune controller with a rugged, specially-designed, high-cycle, high-life pulse width valve. The LPS uses a 4-20 mA output signal from a customer-supplied level probe, and has tight-seating shutoff.

Applications:

Level Pulse Control System applications include precisely modulating liquid refrigerant to feed recirculator packages, pump accumulators, receivers, intercoolers, and surge drums connected to flooded heat exchangers and process equipment. Ideally suited for use with Hansen's Vari-Level® (with MOD420) or Techni-Level® Level Transducer probes.

Pulse-Width Valve MATERIAL SPECIFICATIONS

Bodies:
Ductile iron and cast steel

Seats:
Teflon

Safe Working Pressure:
400 psig (27 bar)

MOPD:
285 psi (19.7 bar)

Refrigerant Temperature:
–60°F to +240°F (–50°C to +115°C)

Refrigerants:
ammonia, R22, R134a, and other Hansen approved refrigerants

Controller

Electrical:
24 to 28 VAC, 50/60 Hz, 60VA

Input:
4–20 mA loop

Impedance:
100 ohm

Enclosure:
Watertight, NEMA 4

Ambient temperature:
–20°F to +150°F (–29°C to +65°C); 90% RH Max

Bulletins

• LPS (P479)