IM-P403-89
EMM Issue 8
41
6.4.4 INPUT menu
Allows selection of the type of measurement to be performed.
INPUT
T COMP
INPUT
TDS
Temperature compensation.
If no Pt100 is fitted, a constant temperature can be entered.
e.g. 184
°C (default).
Allows selection of all the TDS control features: Sensor type,
purge, filter, range, set point, hysteresis, calibration, and
calibration interval.
6.4.5 INPUT – TDS sub-menu
INPUT
TDS
SENSOR
INPUT
TDS
PURGE
INPUT
TDS
FILTER
INPUT
TDS
RANGE
INPUT
TDS
SP
INPUT
TDS
HYST
INPUT
TDS
CAL
INPUT
TDS
CAL INT
Selects the sensor type – CP10, CP30 or CP32. If a CP32 is fitted
and selected the user can select '
flt mode
' – 'action on fault': OFF,
ALARM, CLEAN, or AL + CLEAN. See INPUT – TDS – SENSOR –
FLT MODE notes.
Selects the purge
duration
when the sensor is in the pipeline –
See Purge sub-menu notes.
This feature is only shown if no purge time is selected, i.e. probe in
boiler. Increases the damping effect on the probe output. If the probe
is installed directly in the boiler, select ON. Filter ON – 64 seconds
(default) or OFF, which gives an 8 second delay.
Sets range, 9.990, 99.90, 999.0 or 9990, for ppm or µS / cm.
Set point. The conductivity value at which the blowdown valve will
open. 0 – 100% FS, 1% resolution.
Select a hysteresis value (dead-band) to prevent over-frequent valve
operation in a turbulent boiler.
Hysterisis – 5% (default), 0 – 100% FS, 1% resolution.
Example:- SP = 3000 ppm - 5% hysterisis = 150 ppm.
The valve will open at 3000 ppm and close at 2850 ppm.
The calibration figure is found by sampling the boiler water. This figure
is used to calibrate the controller in µS / cm or ppm.
See INPUT – TDS – CAL notes.
Calibration interval – a countdown timer to remind the user to
recalibrate the system. Can be configured in 1-26 week steps. If 0
CAL INT is not active.
Summary of Contents for BC3250
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