Automation, Inc.
™
16
TM_GF-
A
2
1
00_2200_R1A
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
Alarm Interface, Options and Descriptions
The programmable alarm permits user selection of the alarm interface, alarm source and alarm type as follows:
Alarm Interface (LED PWR Jumper)
The alarm interface can be configured as relay dry contacts (30VDC/24VAC 3 amp maximum either N.O. or N.C.) or as
direct LED drive output (15 mA typical) using the LED PWR jumper on the transmitter circuit board shown in Figure 9.
Alarm Source (ALR SRC=)
The alarm source can be programmed within the Setup menu to monitor Probe 1 or Probe 2 airflow (A
ALR SRC=FLOW),
temperature (A
ALR SRC=TEMP), or the difference in flow between Probes 1 and 2 (A
ALR SRC=DIFF). It can also be set to
monitor the overall health/status of the transmitter and probe (A
ALR SRC=TRBL)to activate an alarm in the event of a fault
detected in the sensor or transmitter.
Alarm Type (ALR TYP=)
The alarm type can be set to monitor airflow or temperature and activate an alarm when airflow or temperature are above
a preset High Limit value (A
ALR TYP=HI), below a preset Low Limit value (A
ALR TYP=LO), or outside of a preset Deadband
operating range (A
ALR TYP=DEADB). The alarm hysteresis (A
ALRM HYS=) value is used to establish a range as a percent-
age above and below the alarm setpoint value.
The following alarm types are available in the Setup menu (refer to Setup Menu detail later in this document):
ALR TYP=DEADB
Sets alarm as Deadband type, where measurement outside of a range defined by the
setpoint value (A
ASP=) plus or minus the hysteresis (A
ALRM HYS=) value causes alarm
activation. The alarm is reset when the measured value returns within this range.
ALR TYP=HI
Sets alarm as a Hi Limit type, where measurement above the A
ASP= value causes alarm
activation. The alarm is reset when measurement decreases below the A
ASP= value minus
the A
ALRM HYS= value.
ALR TYP=LO
Sets alarm as a Low Limit type, where measurement below the A
ASP= value causes alarm
activation. The alarm is reset when measurement increases above the A
ASP= value plus
the A
ALRM HYS= value.
ASP= (value)
Sets the alarm setpoint measurement value that establishes alarm activity in conjunction
with the other alarm options.
ALRM HYS= (value)
Sets the alarm range expressed as a percentage of the A
ASP= value.
For A
ALR TYP=DEADB, measured values outside of this range will trigger the alarm.
For A
ALR TYP=HI (and L
LO), the A
ALRM HYS= value sets the range above or below the A
ASP=
value where the alarm remains active once triggered.
ADEL= (value)
Sets the delay period (in seconds) that the alarm condition must exist before the alarm
output is activated.
ALRM POL= (value)
Sets the relay dry contact configuration at terminals 4 and 5; For A
ALRM POL=NO, contacts
are normally open and close on alarm; For A
ALRM POL=NC contacts are normally closed and
open on alarm.
The accuracy of the GF-A2100/GF-A2200 is “percent of reading”, and is therefore not dependent on the full scale out-
put range selected. However, if desired, the factory default full scale output range setting can be reconfigured in the field
(see: CHANGING FACTORY DEFAULT SETTINGS).