ES-405-9800 Manual Rev A Page 22
7 CALIBRATE MENU – FIELD CALIBRATIONS
The ES-405 has a system of calibration menus which allow the operator to audit or calibrate the
airflow control system parameters for optimal performance. These parameters are often audited
monthly and calibrated quarterly during continuous operation. The exact frequency may vary
depending on the harshness of the local conditions and the data validation requirements
established by the sampling program administrator and your resulting standard operating
procedures (SOP).
The CALIBRATE menu is located in the main ES-405 menu. Use the arrow keys to select
CALIBRATE option in the main menu, then press the ENTER key to enter the menu. Use the ▲▼
keys to select the desired sub-menu and press the ENTER key again to enter. The top
CALIBRATE menu is shown below
7.1 CALIBRATE Menu
7.1.1 CALIBRATE Flow Screen
The SET POINT parameter is the target flow rate that the ES-405 will attempt to maintain.
The FLOW parameter is the current reading from the ES-405 flow sensor, in actual volumetric
liters per minute. The ES-405 should automatically regulate to the setpoint (1.0 LPM) when the
flow calibration screen is entered. This may take a moment.
The STANDARD parameter is where you can enter the correct value from your traceable flow
meter, using the arrow keys. The flow reading that you enter must be in actual conditions.
The FLOW value should change to match the STANDARD value when you press the CALIBRATE
soft key.
The DEFAULT soft key can be pressed to clear out all previous field calibrations and restore the
factory calibration for the sensor. Use this if difficulty is encountered during the calibration. Press
ESC to escape without changes.
Note: To audit the ES-405 flow rate without changing the calibration, simply compare the FLOW
value to your traceable standard and record the results. If the CALIBRATE soft key is not pressed,
then no flow calibrations are affected.
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