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Operation - Menu:
Use this function to measure the performance of a
pressure switch (mechanical operation and hysteresis).
To save battery power, we recommend that you use an
external power supply with this function.
Pressure switch input - Set up and use
1. Connect the instrument (Figure 2/Table 3).
2. Menu: Set this function to On (Refer to "To start - Menu
operation").
Pin 7 (Switch)
Pin 2 (GND)
Figure 2: Example configuration - Switch input
Figure 2 shows the display when the switch condition
changes (open or closed). The analogue dial and the %
indication continue to monitor the normal pressure.
The switch symbol and the value on the main display flash
to give the switch condition and the switch pressure.
To reset the monitor function, press this button.
Operation - Menu: Calibration
Refer to the "Calibration" section.
Operation - Menu:
Set low/high alarm
Use the alarm function to show when the pressure is not in
the specified limits for the system.
Set applicable values in the range 0 to 105% FSO:
%FSO = [ Applied Pressure / (FSO High — FSO Low) ] * 100
Note: If you set a tare value, the alarm function uses the
calibrated range (Refer to "Operation - Menu: Set tare").
The alarm indication is available on the display and as a
signal output (Table 3).
While there is an alarm condition, the applicable alarm
symbol (high or low) flashes on the display (A1: Item 15).
To save battery power, we recommend that you use an
external power supply with this function.
6
- [EN] English
Monitor a pressure switch
Pin 1 (+), 2 (GND)
12- 24V dc
Low/high alarm - Set up and use
Menu: Set this function to On (Refer to "To start - Menu
operation"). Then use these steps to set the low and/or
high alarm.
Alarm
1
(% FSO)
Digit = 0 or 1
5. To finish, repeat steps 3 + 4 for each digit.
If the value you enter is not correct, the value resets to the
nearest permitted value. That is:
• a value in the range 0 to 105% FSO
• a low alarm value < high alarm value
To accept or change the new value, repeat steps 1 to 5.
To cancel the new value, press this button.
Operation - Menu:
Use the Vout function to supply a voltage output (0 to 5V)
to an external system. There are two options:
P-V: Vout is proportional to the pressure value on the
display.
US: User mode. Set a value in the Vout register (0 to
100%) to control an external pressure regulator.
To save battery power, we recommend that you use an
external power supply with this function.
P-V mode voltage calculation
Example DPI 104: FSO = 20 bar (or 300 psi),
Vout scale factor = 1.00.
If you apply 10 bar (or 150 psi) to this DPI 104:
Vout = ( 10/20 * 5V ) / 1.0 OR ( 150/300 * 5V) / 1.0 = 2.5V
US mode voltage calculation
This calculation uses the values set up for the Vout register
and the Vout scale factor.
If the pressure ranges for the DPI 104 and the regulator are
different, set a new Vout scale factor (refer to "Operation -
Menu: Set Vout scale factor").
Vout =
( Vout register / 100 )
Vout scale factor
Example if the Vout register is set to 25%, and the Vout
scale factor is set to 0.5:
Vout = ( 25/100 * 5V ) / 0.5 = 2.5 V
Voltage output (Vout) - Set up and use
1. Connect the instrument (Figure 3).
2. Menu: Set this function to OFF, P-V, US (Refer to "To
start - Menu operation").
Alarm
2
3
(% FSO)
Digit = 0 to 9
Supply voltage output (Vout)
* 5V
K394 Issue 1
4
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