Arthur Grillo DPC200-AC Installation And Operation Manual - Page 13
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5.6 Threshold calculation
NOTICE
Exampel: Threshold calculation
The set limit value must be between minimum and maximum flow.
As reference device we choose DPC200-AC with a measuring range of 0...1000 Pa.
The limit value calculation formula: V = √ΔP × k
Given values:
Measuring range = 0...1000 Pa; k-factor (k) = 116; Limit value (V) = 1,200 m
It follows: ΔP= (V / k)
Minimal flow: V_min = √(0.005 x 1000) x 116 = 259 m
Maximal flow: V_max = √(1000) x 116 = 3,668 m
Result: The limit value of 1,200 m
our DPC200-AC-R (0...1000 Pa).
5.7 Function alarm output
The DPC200-AC has an open collector alarm output; depending on the operating mode
the function is different. At the alarm event a contact between terminal no. 7 and no. 8
gets low-resistive and can be loaded with a maximum of 30 V DC/ 30 mA. When the alarm
is switched off the contact will be high-resistive.
During alarm state in the control mode / measuring mode an exclamation point (!)
is displayed (2nd line / 16th character).
Control mode: In order to recognize the limits of control, the alarm output in the control
mode refers to the set maximum output voltage (MaxU
item „output voltage".
Alarm ON: Output voltage for 12 seconds constantly greater than: 0.95 • MaxU
Alarm OFF: Output voltage for 12 seconds constantly less than:
Measuring mode: For limit value monitoring a limit value can be entered. This value is
set in the menu item „limit switch". The previously set parameters are taken into account
(unit, parameter, k-factor and the measuring range).
As default setting the limits are not active - Display - 2nd line: „OFF"
Alarm ON: Measurement for 12 seconds constantly greater than 1.0 • limit value
Alarm OFF: Measurement for 12 seconds constantly less than 0.95 • limit value
The device requires a minimum pressure to calculate a volume
flow.
Minimum pressure = 0.5 % of the product mesuring range
PRESSURE < 0.5 % measuring range = Display shows 0 m
Minimal flow: V_min = √(0.005 x measuring range) x k
Maximal flow: V_max = √(measuring range) x k
= (1,200 / 116)
2
3
In the default setting the value is set to 10 V DC.
Doc.-no.: DPC200-AC_01_EN
= 107 Pa > 5 Pa = 0.5 % of the measuring range
2
/h
3
/h
3
/h is between V_min and V_max and adjustable by
out
Issue: 07/2019
). MaxU
can be set in the menu
out
0.9 • MaxU
OPERATION
/h
3
/h
3
out
out
13