APPLICATION The BOLL Differential Pressure Indi­ cator is a robust and compact device indicating the contamination level of the ­ ilter elements. f The differential pressure between fil­ BOLL Differential Pressure Indicator TYPE TYPE TYPE TYPE ter inlet and filter outlet is the meas­ urable indicator for the contamina­ tion degree of the filter element. When the preset maximum value of differential pressure is reached, the filter needs to be cleaned. The colour of the disc segments vis­ ible in the two displays indicates the contamination degree: The red segment rises proportionally to the level of contamination. When the segment is completely red, the dif­ ferential pressure limit is reached. DESIGN AND OPERATION Inside the device is a plunger which is held in zero position by a spring. As differential pressure rises with in­ creasing contamination, the plunger is displaced against the resistance of the spring. By magnetic transmission the display disc turns according to the movement of the plunger and shows more and more red segments. The setting of the requested differential pressure is effected by factory instal­ lation of a corresponding spring. Differential Pressure Indicators with In case of type 4.46 the internal parts integral electronic contacts are pro­ are made of stainless steel and for vided with two switches which can be independently used either as The housing of the Differential Pres­ switching contact or alarm contact. sure Indicator is made of coated electrostatic charge, the cover glass may only be cleaned with a ferential pressure threshold value, operating pressure of up to 100 bar.­ damp cloth.

T ypes o f di f f erential press u r E indicators without contacts Type Application / Medium Oil, 4.36.1 Fuels, Cooling Lubricants Make TYP4.36.2 break Make 09.01.06 contact contact Water and chemicals 4.46.1 compatible with austenitic + steels and Viton Type of connector for electrical wiring 1 x M20 x 1.5 Harting plug type R 15 M M20 x 1,5 Harting plug type Han 7D M20 x 1.5 1 x M20 x 1.5 Harting plug type R 15 M M20 x 1.5 Harting plug type Han 7D M20 x 1.5 Protection class AUSFUEHRUNG: SCHUTZART Circuit diagram ELEKTRISCHE DATEN : SCHALTSPANNUNG V= MAX.= 250 ELEKTRISCHE DATEN : SCHALTSPANNUNG220...