| The PC45 is a microprocessor based control system that monitors the critical
stages of a metal pretreatment line. The system provides an alarm if
any of the measured parameters go out of specification. Control outputs are
also provided which are used to automatically control dosing pumps to hold
the readings in specification.
The system can be used with most of the proprietary chemical products currently on the market.
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PC45 has three dosing modes of operation, “Auto”, “Man” and “Off”.
Selection of “Auto” operation causes the dosing pump to be controlled automatically
by the PID controller to maintain the process at the user-entered setpoint.
“Off” prevents the dosing pump from running. In “Man” mode a percentage
run time can be entered, for example 25% might be selected - in the event
of a sensing system failure - to add chemical at a constant rate.
The system is interlocked to the line and will only dose chemicals when the line is
running.
There is special software for Zinc Phosphate applications to control the
Phosphate/Accelerator ratio and ensure it is always optimised. An extra
dose of accelerator can be added when required, for example after a prolonged
line stoppage to compensate for losses.
The PC45 has alarms that can be configured as deviation alarms from the user
entered setpoints. Active alarms are indicated on the display and cause
the alarm beacon to flash. The alarm can be acknowledged to stop the
beacon.
Features
- Clear digital bath strength displays
- Conductivity, pH, Fluoride sensing options
- Automatic temperature compensation
- Non contacting conductivity sensor - eliminates fouling problems
- pH resolution 0.01 pH units
- User friendly - simple to operate
- PID controlled time proportioned output
- Alarm to warn of out of specification conditions
- Utilises 4~20 mA, 2 wire transmitters for interference free signal transmission.
- Control panel may be sited up to 1000 meters from transmitter.
Technical Details
Environmental
Enclosure sealed to IP65
Electrical
110V/230V AC 50/60 Hz, 5 amps Instrument is CE Marked in accordance with EN50081-2, and EN50082-2.
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Probe system
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Total Acid/Alkali
Toroidal (inductive) conductivity sensor
with automatic temperature compensation.
2 wire 4~20 mA transmitter.
pH/Fluoride
Industrial pH or Fluoride sensor with double
junction reference electrode, integral pre-amplifier, and automatic temperature
compensation.
2 wire 4~20 mA transmitter.
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Outputs
Relay (110V/230V AC, 2A non inductive
load) or 4~20mA outputs, dependent on system specification. Fully
configurable for PID control.
Display ranges
Custom configurable to any desired bath strength units.
Communications
RS232, RS485 and Ethernet data transmission.
Control Options
The PC45 can run up to three control loops. This means that in addition
to a Zinc Phosphate stage it can control two other processes. Some
example configurations are given below.
Loop 1
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Loop 2
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Loop 3
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Zinc Phosphate
(with Accelerator ratio dose)
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Spare
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Spare
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Zinc Phosphate
(with Accelerator ratio dose)
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Temperature Monitor
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Spare
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Alkali Cleaner
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Zinc Phosphate
(with Accelerator ratio dose)
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Spare
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Alkali Cleaner
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Zinc Phosphate
(with Accelerator ratio dose)
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Rinse
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Alkali Cleaner
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Surface Conditioner
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Zinc Phosphate
(with Accelerator ratio dose)
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Alkali Cleaner
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Alkali Cleaner
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Zinc Phosphate
(with Accelerator ratio dose)
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Alkali Cleaner
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Zinc Phosphate
(with Accelerator ratio dose)
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Fluoride (Phosphate stage)
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