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pH CONTROLLER PPH-1
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Description:
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The
PPH-1 is a pH controller designed for cooling tower circuits. It utilizes a
sensor to measure the level
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of pH, when a certain level of pH is
reached the controller will trigger dosing cycles.
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The
dosing cycle can operate in three ways. The first operates by cycling on/off
timers, this is khown
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as normal. The second operates in a
proportional manner, dosing towards the set point at a reduced
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rate. This avoids over dosing. The
third is known as adaptive proportional capacity to ‘learn’ from the
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behavior of the system and
adjust it’s on and off by an algorithm programmed into the instrument.
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The
pH controller also features an alarm and 4-20 mA
output.
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FEATURES
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 0-14 pH range with 0.01pH resolution.
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Large 3 ½ digital LCD display.
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Enter all calibration parameters into
non-volatile memory with an easy to use rotary encoder.
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Increased fine-tuning of dosing with
automatic pulse width modulation.
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Alarm output with high and low set
point. Potential free relay contacts.
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Fully isolated 4-20mA current output.
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240VAC/5A relay output easily connected
via 3 way terminal strip.
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4-20mA signal output configurable over
entire 0-14pH range.
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Thermo plastic enclosure with transparent
cover: Rated to IP55 specifications.
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SPECIFICATIONS
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Range:
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0
to 14pH with 0.01pH resolution
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Display:
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3
½ digit LCD display
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Indicators:
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LED
lights to indicate set point operation, pulse mode, flow and configuration
status.
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Calibration:
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All
calibration parameters are programmed into non-volatile memory.
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Electrode:
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BNC,
external of housing.
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Signal
output:
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4-20mA
software configured over range 0-14pH. Screw terminals for fully isolated
4-20mA output located by removing front section.
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Control
range:
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Set
point range 0pH to 14pH
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Output
relay:
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240
VAC, 5 Amps max. resistive
load. 3 terminals provide earth, neutral and active.
5A
fuse protects instrument and relay output.
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Pulsed
output:
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Selected
through setup program. Pulse width adjusts automatically to suit dosing
requirements. On time changes from continuous to minimum 1.5 seconds. Pulse
interval increases/decreases to further fine-tune a dosing cycle.
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Alarm
relay:
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Potential
free contacts.
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Power:
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240VAC
50Hz 7VA max.
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Housing:
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Thermoplastic
with transparent lid. Rated IP 55
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Dimensions:
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130mm
(W) x 95mm (H) x 85mm (D)
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