17
User Manual EE600 Differential Pressure Sensor
5.4.1 Application Settings
This chapter gives some details concerning the possible applications and their inputs.
Beside differential pressure measurement (Pa, kPa, mbar, mm H
2
O, inch WC), the EE600 can be set
up for the following applications:
Volume flow rate measurement (k-factor input)
Air velocity measurement (k-factor input)
Filter monitoring
Level indication
Volume flow measurement
By entering a k-factor under application settings, the EE600 is able to calculate the volume flow (q)
according to the formula:
q = volume flow
[m
3
/h]
∆
p = differential pressure [Pa]
k = k-factor
The k-factor is a characteristic theoretical parameter for each fan model, specified by the manufacturer
in the datasheet of the fan.
Please note: If the data sheet of the fan manufacturer specifies a different method or unit of calculating
the volume flow, the k-factor must be converted accordingly to fit the above formula.
Example: If the k-factor (kspecific) in the data sheet of the fan manufacturer applies for volume flow
calculation in m³/s it has to be converted as follows:
The calculated volume flow (q) is available via BACnet or Modbus protocol in four different units: m
3
/h,
m
3
/s, ft
3
/min, l/s.
The default air density (ρ
20
) value at standard conditions is defined as follows:
Air density (ρ
20
): 1,204 kg/m
3
@: T = 20 °C
(68 °F)
, p = 1 013 mbar
(14,7 psi)
If the air density deviates from standard conditions, a compensation for the calculated volume flow is
necessary.
By entering the specific air density (ρ´) [kg/m
3
] at the operating point, the EE600 applies a
compensation to the calculated volume flow (q´) according to the formula:
q'= volume flow at specific density
[m
3
/h]
∆
p = differential pressure
[Pa]
k = k-factor
ρ' = specific air density
[kg/m
3
]
ρ20 = air density at 20 °C (68 °F)
[kg/m
3
]
Air velocity measurement
By entering a k-factor and the dimensions of the duct (round or square), the EE600 is able to calculate
the air velocity (v) out of the volume flow (q) and the area of the duct.
v = air velocity
[m/s]
q = volume flow
[m
3
/h]
A = Area
[m
2
]
Details for k-factor see application settings for volume flow measurement.
The calculated air velocity (v) is available via BACnet or Modbus protocol in two different units: m/s and
ft/min.
Details for setting air density (when deviating from default air density at standard conditions) see
application settings for volume flow measurement.
Filter monitoring
By entering filter limits for differential pressure, the EE600 is able to calculate a contamination level for
the observed filter in order to plan for maintenance purposes.
