SICK FWE200DH, Руководство по эксплуатации

Страница: 8 / 30

8 8024019/AE00/V1-0/2019-02| SICK A D D E N D U M T O O P E R A T I N G I N S T R U C T I O N S | FWE200DH
Subject to change without notice
2
PRODUCT DESCRIPTION
2.2.1 Purge air heater
The purge air heater installed on the SLV7 blower unit serves to preheat the purge air
required to operate the ejector and for water back purging.
When mixing the cool purge air with the hot process gases, increased crystallization of
salts may occur in the measuring nozzle, resulting in constriction or blockage because the
water content condenses during rapid cooling of the process gas.
To prevent condensate failure, the purge air can be heated with a purge air heater to such
an extent that this effect is suppressed.
Fig. 2: Purge air heater
2.2.2 Pressure regulator
The recommended water pressure for the purging is 3 barg. The water temperature must
not exceed 60 °C. A minimum pressure of 2 barg should be maintained. The system
pressure must not exceed 6 barg otherwise the leak tightness of the solenoid valves
cannot be guaranteed.
To adjust the pressure, pull the control knob on the pressure reducer upwards out of the
lock. Set the desired purging pressure. The integrated water filter serves to filter coarse res-
idues and/or limescale deposits from the supplied water.
NOTE:
Optional extension with heated extraction hose and purge air heater are already
provided for in the FWE200DH with water back purge WBP, the electrical connections
required for this are prepared. However, the heated extraction hose and/or the purge air
heater itself must be ordered separately if required (
see “Optional components”,
page 27 ).
NOTICE:
The measuring system must be mounted decoupled from the duct in order to prevent
damage caused by mechanical vibrations.
NOTE:
The use of the purge air heater is not allowed in areas with fire hazards or potentially
explosive atmospheres!
NOTE:
Please observe the operating instructions of the purge air heater on the product-CD.