Installation | Operation Manual MIDIDOS E | 15
the discharge side of the dosing pump that may be caused for example by the accidental
closing of valves whilst the pump is in operation or by a clogged injector.
The PENTABLOC is a combi-accessory that combines, amongst others, the function of a
pressure-sustaining valve as well as being a safety valve. Furthermore, the functions such
as anti-siphon, pressure-relief and flow indicator and monitor are also integrated.
7.5 Injection nozzles
Injection nozzles are used to mix the metered process fluid into a main stream and simul-
taneously fulfill a non-return function. The injection nozzle is usually installed in the main
line from above. Installation from below is only recommended in the case of media with a
tendency to crystallize. Thus entrapped air is able to leave.
In the case of media with a tendency to contaminate the injector, it is advisable to use an
injector that can be dismantled for maintenance and shut off.
Injection fitting mounted from above
Injection fitting mounted
from below (for media with a
tendency to crystallize)
7.6 Electrical connection
• The electrical connection of the dosing pump must be made according to the local
rules and regulations and may only be carried out by technical experts.
• The type of cable and supply pipe’s cross section of the cable must be chosen in
accordance with the engine’s data.
• The connection of the cable to the engine terminal box must be carried out correctly.
We recommend a plug socket screw joint with strain relief.
• The required level of protection is guaranteed by the correct installation of the electri-
cal connector.
• To avoid incorrect dosing after the process ends an electrical and hydraulic locking
device is provided for the dosing pump.
