18
User Manual EE600 Differential Pressure Sensor
For the given application setting (∆p change filter = 800 Pa, ∆p new filter = 100 Pa) a measured
differential pressure at the filter of ∆p = 450 Pa, would mean a contamination level of 50 %:
The filter contamination level is available via BACnet or Modbus protocol expressed in percentage [%].
Level indicator
By entering the density [kg/m
3
] of a fluid the EE600 can act as a level indicator. The differential pressure
level measurement uses the pressure values and the specific weight of the fluid to represent the level in
a tank (see Fig. 10 Mounting examples).
h = Level (cm)
∆
p = Differential pressure (Pa)
ρ = Density of fluid (kg/m
3
)
g = Gravitational acceleration (9,81 m/s
2
)
By applying the positive pressure connection into the tank, the user can measure the height of the
column of that fluid.
The level measurement is available via BACnet or Modbus protocol in two different units: cm and inch.
The maximum measurable level is limited by the highest differential pressure range 0…10 000 Pa.
For example, for water with density 998 kg/m
3
, at 10 000 Pa the maximum height is 102 cm (40 inch).
6 Maintenance and Service
EE600 does not require any special maintenance, nevertheless it is recommended to perform a zero
point adjustment every 12 month. If needed, the enclosure may be cleaned and the device may be re-
adjusted as described below.
6.1 Cleaning
Use a damp soft cloth to remove deposits of dust or dirt from the exterior of the device and from the
display. Do not attempt to clean the interior of the device. Do not use any solvents, alcohol or abrasive
cleaning agents.
6.2 Repairs
Repairs may be carried out by the manufacturer only. The attempt of unauthorised repair excludes any
warranty claims.
6.3 Readjustment of EE600
A periodical readjustment of EE600 might be required by the regulations of certain industries or by the
need of best long-term measurement accuracy. The zero point and the span point can be adjusted with
push buttons on the EE600 electronics board.
For adjustment the device must be powered and the enclosure cover removed. Consequently, the
adjustment may be performed by authorised staff only, observing the handling of electrical sensitive
devices (ESD).
6.3.1 Zero Point Adjustment
The zero point adjustment is used to correct an eventual zero point deviation.
a. Remove the tubes from both pressure connections of the EE600. By this the pressure equal on
both connections. If the sensor has an auto-zero setting, the tubes do not need to be removed.
b. Press “zero point” button 1-2 sec. (see 3 Product Description).
c. The successful zero point adjustment is confirmed by the green LED turning on for 2 seconds.
d. The red LED turning on for 2 seconds indicates that the zero point adjustment did not succeed. In
this case repeat b.
e. The zero point adjustment (b.) may not succeed because of a deviation higher than 5 % of the
original full scale of the device. This is 50 Pa for the 0 – 1 000 Pa range and 500 Pa from the 0 -
