1
1 INTRODUCTION
1.1 Description
of
Unit
Thank you for purchasing the ¼ DIN Alpha pH1000 pH/ORP process controller/transmitter.
This unit is used for measuring either pH or ORP parameter one at a time, and the
operational mode is switchable from the menu. You can use this unit to measure pH or ORP
with limit control. This controller has many user-friendly and safety features which include:
•
Menu-driven program
that simplifies set-up
•
Built-in non-volatile memory backup
to ensure that calibration and other information
are not erased if power supply fails
•
Press-button two-point calibration
and
electrode offset adjustment
from the
keypad
•
Automatic temperature compensation (ATC)
•
Manual temperature compensation
setting without the ATC probe, with independent
setting for calibration and process temperature
•
0 to 2000 second
time delay adjustment
on all relays – minimise false alarms
•
Separately
adjustable
high and low set point hysteresis
(dead bands) prevent
chattering of relays around the set points
•
Asymmetrical/symmetrical
input for pH/ORP operation
•
Three control modes
: limit, proportional pulse length or proportional pulse frequency
•
Large dual display LCD
for easy reading with clear multiple annunciators, alarm
status, operational and error messages
•
Two switching contacts as set-point triggering relays
•
A third relay that can be be set up to perform either
Alarm
or
Wash function
•
When set to work as
Alarm relay
, alerts you when readings exceed set-point limits after
a set time buffer, and if the Pt100/Pt1000 wires are broken or disconnected during the
ATC function
•
Programmable duration and frequency
in the Wash mode
•
Hold
function freezes output current
(0/4…20mA)
and releases control relays
•
LED indicators
signal control activities to monitor controller status from a distance
•
Protection against electromagnetic interference
– galvanically isolated 0/4…20mA
output provides safety for datalogging and control purposes
•
Choice of 7 buffers from
USA or NIST standards
1.2 Applications
Use this controller in panel mounted enclosures for applications such as water treatment and
monitoring, galvanic-decontamination, chemical processing food processing, clean or waste
water control and neutralisation process.
Содержание Alpha pH 1000
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