Arthur Grillo DPC200-MOD Manuel d'installation et d'utilisation - Page 13
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5.7 Threshold calculation
NOTICE
Exampel: Threshold calculation
The set limit value must be between minimum and maximum flow.
As reference device we choose DPC200-MOD 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-MOD (0...1000 Pa).
5.8 Function description - modbus
NOTICE
Hardware features:
The DPC200-MOD has two connection terminals for the Modbus, which are designated A
and B. The Modbus line of the DPC200-MOD can be terminated via a further jumper. This
jumper can be plugged into two positions: terminated or not terminated. The terminating
resistor is 120 Ohm.
Termination:
A device may only be terminated, if it is at the end of a line. Termination serves to dampen
reflections of signals and the resulting harmonic oscillations.
Doc.-no.: DPC200-MOD_02_EN
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
Changes to the holding register are saved to the device's eeprom.
The durability is 100000 times, and should not be exceeded.
= 107 Pa > 5 Pa = 0.5 % of the measuring range
/h
3
/h
3
OPERATION
OPERATION
Issue: 08/2019
/h
3
/h
3
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