Automation, Inc.
™
TM_GF-
A
2
1
00_2200_R1A
17
GF-A2100
AND
GF-A2200 A
IRFLOW
M
EASUREMENT
S
TATION
Air Flow Measurement, PID Control and Alarm Solution - Analog Output
GreenTrol Automation, Inc.
•
156 Holly View Lane Loris, SC 29569
•
Toll Free: 877-4GN-TROL (877.446.8765)
•
Internet:
GreenTrol.com
Table 1. GF-A2100/GF-A2200 Analog Output Flow and Temperature Conversion
Converting Analog Output Signal Values for Airflow and Temperature
The GF-A2100/GF-A2200 analog outputs can be configured to display individual air flow, differential air flow, velocity or
temperature. Units are selected in the System of Units menu for SI or IP units of measure. Table 1 shows analog out-
put scaling and conversions for airflow, volumetric flow and temperature. For example, when the transmitter is set for
normal airflow (CFM/LPS) and AR1/AR2 area is set to 1 square foot (A
AR1/AR2=1.00 SQF), the LCD display and the ana-
log output will both indicate equivalent airflow velocity in FPM. Note that for Differential airflow measurement, zero flow
is indicated at 1/2 of the output range selected in order to permit positive and negative relative flow values.
Flow Rate
1
(CFM/LPS)
Analog Output x
FS
x 0.1
Analog Output x
FS
x 0.2
(Analog Output - 2) x
FS
x 0.125
Differential
Flow Rate
2
(CFM/LPS)
(Analog Output - 5) x
FS
x 0.2
(Analog Output - 2.5) x
FS
x 0.4
(Analog Output - 6) x
FS
x 0.25
Analog Output x
FS
x 0.1
Analog Output x
FS
x 0.2
(Analog Output - 2) x
FS
x 0.125
Area (SQF)
Area (SQF)
Area (SQF)
Analog Output x
FS
x 1000 x 0.1
Analog Output x
FS
x 1000 x 0.2
(Analog Output - 2) x
FS
x 1000 x 0.125
Area (SQM)
Area (SQM)
Area (SQM)
Temp
3
(°F,°C)
[{Analog Output x (
FS
-
MS
)} x 0.1] +
MS
[{Analog Output x (
FS
-
MS
)} x 0.2] +
MS
[(Analog Output - 2) x {(
FS
-
MS
) x 0.125}] +
MS
NOTES:
1. Setup menu for flow measurement (
OUT TYPE=FLOW
).
2. Setup menu for temperature measurement (
OUT TYPE=DIFF
).
4. FS is the full scale analog output value in the Setup Menu (
FS= ____
).
5. MS is the minimum scale analog output value in the Setup Menu (
MS= ____
).
Velocity
1
(MPS)
Velocity
1
(FPM)
3. Setup menu for temperature measurement (
OUT TYPE=TEMP
).
ANALOG OUTPUT SCALING CONVERSION FORMULAE
CONVERT
ANALOG
OUTPUT TO
0-10 VDC
2-10 VDC
0-5 VDC
Sending a Test Output Signal to the Host Control System
A test output signal between 0 and 100% of the selected full scale output (0-10 VDC, 0-5VDC or 2-10 VDC) can be pro-
vided by the GF-A2100/GF-A2200 to verify proper conversion of the output signals from the transmitter at the host con-
trol system. To set a fixed output signal for airflow and temperature, enter the Initialization Menu (Figure 12) and navi-
gate to the “*
*TESTOUT=0%” menu item. Press the “ENTER” button, and then use the “UP” and “DOWN” arrow buttons
to select an output between 0 and 100% of the full scale value. Press the “ENTER” button to set the output percentage.
The GF-A2100/GF-A2200 will now provide the selected analog output value. To cancel the Test output, press the “ESC”
button to return to normal operation.
GF-A2100/GF-A2200 TRANSMITTER SET UP
General
To ensure successful start-up, verify that the airflow measuring station transmitter and probe are installed in accordance
with recommended installation and placement guidelines.
Activate 24VAC power to the instrument. The transmitter executes a complete self-check (that takes approxi-
mately 10 seconds) each time power is applied. Verify that the readings at the host control system return an output that
matches the output of the GF-A2100/GF-A2200.
Check the physical installation, power connections and wiring prior to application of power to the instrument.