Ebtron GTC116 Installation Manual - Ebtron
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5.5 GTC116 Changing Factory Default Setup Menu Settings
5.5.1 Setup Menu Options
The GTC116 Transmitter is setup and tested at the factory to be fully operational when sensor probes are
connected and power is applied (set the power switch to the “ON” position). Factory settings can easily be
changed using the SETUP MENU by simultaneously pressing and releasing the “UP” and “DOWN” buttons while the
transmitter is in its normal operating mode. Appendix A details the SETUP menus. Navigate through the SETUP
menus to make changes to the transmitter configuration. The settings take effect immediately. The following are
common field modifications to the factory default settings.
5.5.2 Adjusting the Low Limit Cutoff Feature
The low limit cutoff feature (menu item LLIMIT= ) forces the output signal for the airflow rate to zero whenever the
calculated airflow rate falls below the specified Low Limit value.
5.5.3 Selecting Actual and Standard Output Measurement Type
The transmitter is set from the factory to provide actual airflow measurement units (displayed as “ACFM” and
“AFPM”). In this mode, airflow measurements are calculated for actual inlet conditions. If using actual airflow,
corrections for altitude are entered through the ALT= setting in the Setup menu. If desired, the output can be set
to provide standard airflow measurement units (displayed as “SCFM” and “SFPM) which provides measurements
that are corrected to standard conditions.
5.5.4 Output Scaling
EBTRON’s Gold Series sensors are individually calibrated between 0 and the factory default full scale in wind
tunnels traceable to the National Institute of Standards and Technology (NIST). Sensors are independent and
produce “percent of reading” accuracy. Changing the full scale value does not change the accuracy of the device.
Factory default analog output scaling can be changed within the SETUP menus.
5.5.5 Changing the LCD Display from Volumetric Flow CFM to Velocity FPM
The GTC116 transmitter is shipped from the factory to indicate volumetric flow. To display velocity in FPM, enter
the SETUP menuand in the DISPLAY submenu, change the “*LCD UM=ACFM” to “*LCD UM=AFPM”. Changing the
LCD display units will not affect the analog output signal.
5.5.6 Converting the Analog Output Signal from FPM to CFM
The GTC116 transmitter is shipped from the factory with analog output “OUTPUT 1” set to indicate velocity in
AFPM. To automatically convert this analog velocity output to volumetric flow (ACFM), simply set the *AO1 UM
from AFPM (default)
to ACFM in the SETUP menu. If you wish to manually convert the velocity output to
volumetric flow (ACFM), simply multiply the indicated output velocity (in FPM) by the free area of the air flow
probe installation location. Refer also to Table 7 for a complete listing of conversions for each of the analog
outputs of the GTC116. The AO1 full scale analog output (OUTPUT1 ) value is determined by the AO1 FS setting
within the SETUP menu.
5.5.7 Locking the Configuration Settings
The GTC116 transmitter configuration settings can be locked at one of three security levels within the SECURITY
submenu using the LOCK SEC= item.
When LOW security level is selected (LOCK SEC=LOW) the last 4 digits of the board serial number are automatically
assigned as the lock code. To see board serial number, navigate to DIAGNOSTICS menu in SERIAL NUMBERS item.
When the MED security level is selected (LOCK SEC=MED) the user enters and confirms a security code. In the
event that this code is lost/misplaced, EBTRON can provide a key that is unique to the transmitter to unlock it.
Contact EBTRON customer service for this code.
When the HIGH security level is selected (LOCK SEC=HIGH) the user enters and confirms a security code. In the
event that this code is lost/misplaced, the transmitter must be returned to the factory in order to unlock it.
When LOCK SEC=HIGH is selected, the user defined setting can only be changed after entering the user
defined code. STORE THE LOCK CODE IN A SAFE LOCATION! For security reasons, the HIGH level lock code
can only be reset by returning the transmitter to the factory.
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