3-O&M_Settings_r1r Section 3Page 6
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3.3.2. Service Description [SERV]
The service description of the measurement location.
[Menu path: SETTINGS >↓ GENERAL >↓ SERV]
Default: AMD
Optional Settings: SA, RA, OA, EX, RE
If the transmitter is configured for two locations, parameters for SERV1 and SERV2 will be displayed
in lieu of SERV and the suffix -1 and -2 will be added to the default and optional service descriptions,
respectively for each location.
More detailed location naming (up to 16 characters) can be accomplished via BACnet.
The service description can be shown on the LCD to facilitate identification. The service description
is particularly useful for display identification on dual location transmitters.
3.3.3. Airflow Calculation Method [AIRFLOW]
The calculation method used by the transmitter to determine the airflow rate.
[Menu path: SETTINGS >↓ GENERAL >↓ AIRFLOW]
Default: ACT (actual airflow)
Optional Settings: STD (standardized mass airflow)
AIRFLOW=ACT. The actual airflow is based on the nominal air density at standardized sea level and the
actual air temperature. Modify the altitude parameter, ALT, to adjust the actual air velocity for the nominal
altitude (or actual barometric pressure on GTx108e and GTx116e transmitters), if different from standardized
sea level.
AIRFLOW=STD. The standardized mass airflow is normalized for 70 °F [21.1 °C] and 29.92” Hg [101.3 kPa].
If AIRFLOW=STD, the letter S will precede the airflow units, FPM [m/s] or CFM [L/s], on the LCD.
The letter S is assumed when AIRFLOW is set to STD and intentionally not shown in additional
references in this document to simplify reading.
3.3.4. Altitude [ALT]
The altitude used to correct the measured airflow for the nominal air density at the elevation above sea level
where the AMD is installed.
[Menu path: SETTINGS >↓ GENERAL >↓ ALT]
Default: 0 (ft) [0 (m)]
Optional Settings: AUTO (GTx108e and GTx116e transmitters only) or 0 to 20000 (ft) [0 to 6000 (m)]
AUTO corrects for the actual barometric pressure rather than the nominal standardized elevation.
The altitude correction only affects the airflow when AIRFLOW=ACT.
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