1
1 INTRODUCTION
1.1 Description
of
Unit
Thank you for purchasing the ¼ DIN Alpha COND 1000 series Conductivity
process controllers. This unit is used for measuring the Conductivity of a
solution, either in micro-Siemens or milli-Siemens, one at a time, and the
operational mode is switchable from the menu. You can use this unit to measure
Conductivity with limit control. This controller has many user-friendly and safety
features which include:
•
Menu-driven program
that simplifies set-up
•
Ten ranges
of Conductivity measurements-software selectable (
Appendix
2
).
•
Built-in memory backup
to ensure that calibration data and other
information are not erased if power supply fails
•
Automatic temperature compensation (ATC)
with Pt100 or Pt 1000
•
Manual temperature compensation
with independent setting for
calibration and process temperature
•
Temperature coefficient variable between 0.00 to 10.00 % per
o
C. Separate
pure water compensation curve stored in memory. Reference temperature
at 25
o
C.
•
0 to 1999 second
time delay adjustment
on all relays – minimise false
alarms
•
Separately
adjustable
high and low set point hysteresis
(dead bands)
prevents chattering of relays around the set points. Selectable
Filter
function stabilises rapid measurement changes
•
Four operating modes
: limit, display monitor , proportional pulse length or
proportional pulse frequency control.
•
Large dual display LCD
for easy reading with clear multiple annunciators,
alarm status and operational message annunciators
•
Two switching contacts as set-point triggering relays
and an alarm
output relay
•
Separate
alarm relay
alerts you when set points have exceeded the limits
and if the Pt100/Pt1000 wires are broken or disconnected during the ATC
function
•
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 data logging and control purposes
1.2
Applications
Use this controller in panel mounted enclosures for applications in water treatment
and demineralization, waste water treatment and neutralization processes.
