Arthur Grillo DPC200-R Installatie- en bedieningshandleiding - Pagina 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-R 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-R (0...1000 Pa).
5.7 Function relay alarm output
The DPC200-R has an relay alarm output; depending on the operating mode the func-
tion is different. In state of alarm the relay switches and is with 250 Vac / 10A loadable.
You can reach the relay via the connection terminal three, four and five.
During alarm state in the control mode / measuring mode an exclamation point
(!) is displayed (2nd line / 16th character).
With the menu item "alarm delay time" the switching delay time can be set, the setting
range is between 1...60 seconds to 2...15 minutes. As default, this value is set to 10s.
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
„output voltage".
In the default setting the value is set to 10 V DC.
Alarm ON: Output voltage for set delay time constantly greater than: 0.95 • MaxU
Alarm OFF: Output voltage for set delay time constantly less than:
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
2
/h is between V_min and V_max and adjustable by
3
Doc.-no.: DPC200-R_02_EN
= 107 Pa > 5 Pa = 0.5 % of the measuring range
/h
3
/h
3
). MaxU
can be set in the menu item
out
out
Issue: 06/2018
OPERATION
/h
3
/h
3
out
0.9 • MaxU
out
13