Omega Chemical Metering System PHP-190 Series

Combine Controller and Pump In One Unit

More details

The PHP-190 Series of chemical metering systems are unique instruments that combine a pulse frequency controller with a diaphragm-type pump in one compact unit. In the control mode, deviations from setpoint are converted to pulses which vary the stroke rate of the metering pump. As the setpoint is approached, the pump feed slows down to minimize chemical loss and overshoot of the endpoint. Variation of the stroke rate is controlled by a front panel potentiometer or through process controlled operation by external electric or mechanical pacing or by closed loop control.

The units are supplied with foot valve, injection valve, power cord, and a float level switch made of polypropylene with a 1.8 m (6') polyethylene-coated cable. Polypropylene (-PP) models include a 3 m and 1.5 m (10' and 5') length of polyethylene tubing. For proper control, a holding tank with a minimum 10-minute residence time is required.


• Combines Controller and Pump in One Unit

Proportional Control

LCD Readout of Process pH or Setpoint

Reverse Direction Control

Control Bandwidth Manually Adjustable, 1 to 3 pH Units

NEMA-4X Enclosure

Choice of PP, PTFE or 316 SS Liquid Ends

Range: pH control 0 to 14 pH
Electrode Connector: BNC (includes SN6-to-BNC adaptor)
Input Impedance: >1012 Ω
Zero Point Adjustment: ±3 pH
Slope Adjustment: 85 to 102%
Setpoint Adjustment: 0 to 100%
Display: 3-digit LCD
Control Bandwidth: 1 to 3 pH units, adjustable
Control Direction: Reversible
Linearity: Better than ±1% range
Reproducibility: Better than ±0.5% range
Operating Temperature: -10 to 45°C (14 to 113°F)
Power: 115 Vac
Wetted Parts:
    -PP: Polypropylene and EPDM
    -T: PTFE
    -S: 316 SS and PTFE All versions have ceramic valve balls
    -S Models: ¼ FNPT
    -T and -PP Models: ¼ x 3⁄16" tubing for PHP-192, PHP-193 or PHP-194; ½ x 3⁄8" tubing for PHP-195 or PHP-196
Ship Weight [kg (lb)]:
    PHP-192 thru 194: -S: 0.7 (1.6); -PP and -T: 0.3 (0.7)
    PHP-195 and 196: -S: 1.5 (3.3); -PP: 0.3 (0.7); -T: 0.5 (1.1)



Model No.

Rating at Max

Back Pressure

bar (psi) I/h (USGPH)
PHP-192 16 (232) 0.75 (0.20)
PHP-193 12 (174) 1.29 (0.34)
PHP-194 7 (101) 2.82 (0.75)
PHP-195 3 (43.5) 6.48 (1.71)
PHP-196 1.5 (22) 12.3 (3.25)

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