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The DHT and specified DHCR Testers are pre-programmed with the calibration number (PPL)
as follows: INTERNAL meter factor to suit the tester turbine, EXTERNAL meter has a standard
calibration number and the actual calibration number from the turbine must be loaded into the
unit.
The DHCR unspecified Testers INTERNAL and EXTERNAL inputs, the calibration numbers
have not been loaded. Both inputs have the standard calibration numbers.
To program these values follow the procedure below:
PROGRAM MODE - EXT, INT and TACH.
External Flow - EXT
1.) Turn selector switch to Ext.Flow and press the ON button.
2.) Press °C/°F button and hold down. Then press ON i.e. two buttons are pressed at the
same time.
3.) On the left side of the display appears the turbine type number i.e. 750 is 750 lpm, on
the right side of the display is the standard calibration number. Use the FAST key to
browse through the list of turbine types. Press UNITS to select a turbine type.
4.) Use the FAST key to increment the number above the cursor. Press UNITS to move to
the next column. After entering the calibration factor press UNITS until the display
overflows. The display will now show the number of digits after the decimal point. Use
the FAST key to select the number of decimal places to appear on the display.
5.) Press the ON button to store the entries.
Internal Flow - INT
The calibration factor for internal flow on the DHT Testers is pre-programmed. It can be checked
as detailed above, but it is not possible to change it. The internal calibration factor on the DHCR
should be loaded by switching to INT and repeating the program instructions above.
TACH
The calibration factor for RPM is pre-programmed for a factor of 1.0. For the RPM/N function
the tachometer provides N pulses per revolution of the shaft.
To set factor N:
1.) Turn selector switch to TACH and press the ON button.
2.) Press °C/°F button and hold down. Then press ON i.e. two buttons are pressed at the
same time.
3.) The display shows the current value for "N". Use the FAST key to increment the number
above the cursor. Press UNITS to move to the next column.
4.) Press the ON button to store the entries.
Programming
Models DHT and DHCR
5
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