Telaire Vaporstat™ Model 9002
Page 3
Output Adjustments
It is only necessary to make the adjustments described in this section if
you would like to adjust the measurements range of the sensor and/or the
analog output range, or adjust relay settings. If you do not wish to make
these adjustments, press
Clear
after you have selected the display/output
units.
Adjust Output Ranges
1.
Use the steps described above in the section “Adjustments Required
for Installation” to cycle through the startup adjustments on the
sensor until you see the display
SETTINGS
.
2.
Press the
Mode
button to begin to adjust settings.
Adjust Measurement Value
for Lower Output Limit
Note:
The lower output limit adjustment does not affect the
display
.
1.
The display will indicate
GRN FROM
or
DP FROM
.
2.
Use the
Arrow
button to adjust the sensor output value you want to
correspond to the low limit used for the analog output.
3.
Press
Enter
to confirm selection; an arrow should flash on the lower
display (not necessary if no adjustment is made).
4.
Press
Mode
to move to the next selection.
Adjust Measurement Value for Upper
Output Limit
Note:
The upper output limit adjustment does not affect the
display.
1.
The display will indicate
GRN TO
or
DP TO
.
Note:
It is possible to adjust the output to consider
concentrations up to 300 grains or a 100
°
F
dew point.
2.
Use the
Arrow
button to adjust the sensor output value you want to
correspond to the upper limit used for the analog output.
3.
Press
Enter
to confirm the selection (not necessary if no adjustment
is made).
4.
Press
Mode
to move to the next selection.
Analog Output
- The analog output of the sensor will correspond to the
units selected for the LCD display. The sensor is set at the factory to pro-
vide linear 0-10 volt and 4-20 mA outputs over the full measurement
scale of the sensor. If necessary, the analog output range and the mea-
surement range can be user-adjusted to meet any unique requirements
such as a data logger, which may only accept a 0-5 volt input.
Select the Analog Output Scaling Units
The top line of the display will read
OUTPUT
.
1.
Use the
Arrow
button to select if you want to scale the measurement
range to
V
or
mA
. It should be noted that the scaling adjustment you
select will be applied to both the voltage and mA output. For
example, if you program 0-5 volt output for a 0 to 80
°
F
measurement range, the mA output will be 4-12 mA for a 0 to 80
°
F
measurement range.
2.
Once you have selected the preferred value for scaling (
V
or
mA
),
press
Mode
.
Select the Lower Limit for Analog Output
1.
The top line of the display will read
V FROM
(or
mA FROM
).
2.
Use the
Arrow
button to select the lower analog output value you
wish to use to correspond to the low limit measurement value set in
step 2
of the section
“Adjust Measurement Value for Lower Output
Limit”
above.
3.
Press
Enter
to confirm selection (not necessary if no adjustment is
made).
4.
Press
Mode
to move to the next selection.
Select the Upper Limit for Analog Output
1.
The top line of the display will read
V TO
(or
mA TO
)
2.
Use the
Arrow
button to select the upper analog output value you
wish to use to correspond to the low limit measurement value set in
step 2 of the section
“Adjust Measurement Value for Upper Output
.
3.
Press
Enter
to confirm the selection (not necessary if no adjustment
is made).
4.
Press
Mode
to move to the next selection
Relay Set Point and Hysteresis
The normally open/closed relay contacts can be set to a specific set point
and hysteresis (dead band). The set point is the point at which the relay is
energized as concentrations rise. Hysteresis is the difference at which the
relay de-energizes when concentrations drop below the set point. The
sensor relay is factory-set to energize at 55
°
F dew point (65 grains/lb).
The hysteresis is factory-set at 2
°
F dew point (5 grains/lb).
Adjust Relay Activation Levels
1.
The top line of the display will read
RELAY ON
.
2.
Use
Arrows
to select relay on value desired (set point).
3.
Press
Enter
to confirm the selection.
4.
Press
Mode
button to the next selection.
5.
The top line of the display will read
HYSTER
.
6.
Use
Arrows
to select relay hysteresis value desired (dead band).
7.
Press
Enter
to confirm the selection.
8.
Press
Mode
button to exit the adjustment mode.