Telaire Vaporstat™ Model 9002
Page 5
Zero Point Calibration
All tubing should be connected between the gas bottle and the sensor
inlet flow port, as shown in Figure 2 below. Gas should be flowing to the
sensor at a rate of 80-100 cc/minute for a minimum of 5 minutes prior to
initiating calibration.
Figure 2: Zero Point Calibration - Setup
1.
Attach the short hose to the bottom port on the flowmeter.
2.
Attach the long hose to the top port on the flowmeter.
3.
To insure the flowmeter is kept in the vertical position, secure the
flowmeter to the side of gas bottle using the supplied tie wrap.
4.
Remove the protective cap from the nitrogen bottle and attach the
gas regulator.
5.
Attach the open end of the bottom hose (located on the flowmeter) to
the gas regulator. Slide the hose far enough on the gas port to ensure
a secure, airtight connection.
6.
Insert the male Luer fitting (located on the longer hose) into the
calibration port, located on the bottom of the Model 9002.
7.
Verify all the components are installed correctly and initiate the
calibration process by turning the knob on the regulator. Turn the
knob until the indicator reaches 7 psi.
8.
Turn the flowmeter knob until the floater reaches 80 -100 cc/ min.
9.
Allow the gas to flow for at least 5 minutes before proceeding.
10.
Press and hold the
Clear + Enter
buttons on the keypad for 5
seconds. The word
CAL
will appear in the top line of the LCD
display.
11.
Use the
Arrow
buttons to toggle to the
ZERO
calibration mode.
12.
When
ZERO
is displayed, press the enter button to initiate the
calibration process.
13.
Once the
Enter
button is pressed the calibration process will take
approximately 8 minutes, during which time the green LED below
the display will flash repeatedly. Once calibration is complete the
sensor will revert to its normal display mode.
14.
Once the display has returned to normal, turn the gas off and
disconnect the tubing connection to complete the process.
Conversion Factors
Dew Point and Relative Humidity (RH)
While the measure of relative humidity is highly dependent on the
temperature of air, the measurement of dew point is not. We can use dew
point to predict what the relative humidity of air will be at a particular
temperature. For a designer or controls contractor, this means that dew
point can be used to predict and control water concentrations in air to
ensure a target relative humidity is not exceeded for a design indoor
temperature condition. The conversion factors chart, as shown in
Figure 3 below, can be used to establish dew point set points for various
common target relative humidity levels over a range of typical
conditioned space temperatures.
Figure 3: Conversion Factors - Chart
cc
/
m
i
n
AIR
200
100
60
ON
O
F
F
5
10
15 20
25
30
clear
mode
enter
Male Luer
F
itting
F
lo
w
meter
16L
B
ottle
Nitrogen
T
ie
W
rap
Regulator
Gas
P
ort
12
” T
u
b
ing
5
F
oot
o
f T
u
b
ing
F
lo
w
meter
K
no
b
Regulator
K
no
b