46
Operation:
Conductivity probe
Water level control: conductivity probe.
Operation
Probe system
Standard water systems use a conductivity probe to
control water levels for optimum operating efficiency.
The three-probe system is monitored by the
VAPOR-LOGIC
®
3
board, which performs all the
necessary logic and timing functions to provide total
water level control and safety shutdown.
VAPOR-LOGIC
3
automatically maintains the water
level between the upper two probes A and B (see
Figures 46-1 and 46-2 below). When the water
level falls below probe B, the fill valve is opened
until the water level reaches the upper probe A. Water
must remain in contact with the probe surface for a
minimum of two seconds for VAPOR-LOGIC
3
to
determine that the water is at the probe's level,
ensuring that turbulence does not cause an incorrect
level reading.
Figure 46-1: Conductivity probe system
for GTS
®
, VLC
®
, HUMIDI-TECH
®
and CRUV
®
Each time the fill valve is energized, the probe system
is tested by the VAPOR-LOGIC
3
system. If the signal
from the probe assembly is beginning to deteriorate,
the message Replace probes will appear. Once the
probe system has reached its maximum usable life,
the humidifier will shut down and the message Probe
fault will appear.
An adjustable skim time allows for an extended skim
period (0-120 seconds) to reduce surface mineral
accumulation. When skimming, the fill valve remains
energized for the designated delay time after the
water level reaches the upper probe A.
Probe C provides low water protection for the heating
elements. If the water level falls below probe C, the
heaters are de-energized.
Figure 46-2: Conductivity probe system
for STS
®
and LTS
®
Water level - A
Water level - B
Water level - C
OM-632
Water level - C
Water level - B
Water level - A
OM-270
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Summary of Contents for Vapor-logic3
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