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2.4 Boiler Conductivity
Conductivity on boiler systems can be congured for Timed Sampling, Sample and Hold or Continuous for
the conductivity sampling method.
Timed sampling incorporates a sample timer which allows the boiler to be sampled at periodic intervals.
Sample intervals are adjustable from 1 minute to 99 hours, 59 min. Sample duration (on-time) is adjustable
from 1 second to 99 minutes, 59 seconds.
Sample and hold uses a sample timer for periodic sampling intervals. The unit will sample for its duration
then hold the blowdown valve closed for a settable period (hold time). The conductivity is checked at the end
of the hold period, if additional blowdown is required the blowdown valve is held open for a preset amount of
time (blowdown time). Then sample cycle is repeated.
Continuous sample has a sample of boiler or condensate water go past the probe continuously. If the
reading is above the set point, blowdown will continue until the set point has been satised.
SET POINT - What reading turns the relay on
DIFFERENTIAL - Amount reading changes by before
the relay is turned o
HIGH ALARM - What reading generates a High alarm
notication.
LOW ALARM - What reading generates a Low alarm
notication.
SAMPLE INT - Period between samples.
SAMPLE DUR - How long a sample lasts.
HOLD TIME - How long a hold lasts.
BLOWDOWN - How long to blowdown if reading is
above the set point after the hold. Hold repeated after
BLOWDOWN time.
2.5 Aux Inputs
Auxiliary inputs are the digital inputs for optional Flow Switch and other digital inputs such as low drum level
alarms. From these menus the user can set if they want each of the alarms Displayed, Remote Notication,
both or none.
>SYSTEM 1 COND SETPOINT<
SET POINT SAMPLE INT
DIFFERENTIAL SAMPLE DUR
HIGH ALARM HOLD TIME
LOW ALARM BLOWDOWN
>SYSTEM 1 DIGITAL INPUTS ALARM<
ALARM NOTIFICATION DIGITAL 1
FLOW SW = DISPLAY DIGITAL 2
DIGITAL 1 = DISPLAY DIGITAL 3
DIGITAL 4
FLOW ALARM DIGITAL 5
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