Dwyer Instruments DH-006 - Display and Advanced Settings; POL and POH (Process Output Low and High) Sub Menus

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rESO (Resolution) SUB MENU
The Digihelic
®
Controller is capable of displaying four digits of resolution.
However, at very low pressures the instability of the pressure may cause
fluctuations in the least significant digit causing the least significant digit to be
of little value. Three digit resolution (
3DIG ) can only be active when there is at
least one digit to the right of a decimal.
3DIG - Set display for 3 digit resolution
4DIG - Set display for 4 digit resolution
Pd.S (Process Display) SUB MENU
STD - Display reads pressure, velocity, or flow values
PCT - Display reads % of full scale value
When the display is reading percent,
PCT is displayed in the upper right of
the display. The percent display is only available in pressure operation.
DAMP (Dampening) SUB MENU
Adjust from 1-16
Dampening stabilizes the display from instabilities due to things such as
vibration and excessive pressure fluctuations. The dampening setting adjusts
the amount of readings that are averaged for each display update. Adjust
the dampening value until the display reads a stable value for the application.
AdU (Advanced) MAIN MENU
POL - Process output low ADDR - Modbus
®
Protocol address
POH - Process output high WR - Modbus
®
Protocol write enable/disable
MSP1 - Maintenance set point 1 ZERO - Zero calibration
MSP2 - Maintenance set point 2 SPAN - Span calibration
POL and POH (Process Output Low and High) SUB MENUS
This feature is used in pressure operation only.
Process output low and high are used to scale the 4-20 mA output. Set
POL to the desired display reading for 4mA output, and set POH to the
desired display reading for 20 mA output. POH must be higher than POL .
POL may be adjusted 2% BELOW minimum scale up to POH . POH may
be adjusted from
POL to 2% ABOVE maximum scale.
B-32:B-32 7/9/09 2:52 PM Page 19
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