Page is loading ...
DATA SHEET
Differential Pressure Monitor
Monitoring of the Purge Air Supply with
In-situ Measuring Systems
Application
The differential pressure monitor is
used for monitoring the purge-air sup-
ply with SICK in-situ measuring sy-
stems. A purge-air blower supplies the
purging-air attachments of the measu-
ring system. The air ow protects the
optical surfaces from, e.g. contamina-
tion or aggressive gases of the waste
gas channel. If the purge-air supply is
not sufcient the differential pressu-
re monitor issues a warning signal via
potentially free contacts.
To ensure safe monitoring of the pur-
ge-air supply the differential pressure
monitor should be installed to the in-
lets of the purge-air attachments.
The differential pressure monitor used in a SICK measuring system e.g. DUSTHUNTER
Flange connection
Purge-air attachment
of the measuring system
Purge-air inlet
Differential
pressure monitor
Purge-air hose
Measuring nozzle
Pressure connection:
higher pressure at P1 (+)
lower pressure at P2 (–)
COM 3
2 NO
P
P
3
2
1
1 NC
60
50
40
30
20
10
0
20
30 40 50 60 70 80 90
∆ P = f (V)
Dimensional drawing
Installation
Attach the hose end of the pressure
monitor with help of the hose band
clip. Attach the purge-air hose with
help of the hose band clip to the inlet
of the pressure monitor.
Setting range
The switching threshold of the
pressure monitor can be set at 5 to
20 hPa for min. purge-air supply (cor-
responding to appr. 20 to 60 m
3
/h;
5.3 to 15.9 gal/h).
Function, settings
During standard operation of the mea-
suring system the purge-air supply is
continuous active. The switching
threshold for minimum purge-air
quantity on the differential pressure
monitor is congurable. If the purge-
air quantity decreases the value
of this switching threshold, the diffe-
rential pressure monitor switches the
potentially free contact in order to si-
gnal missing purge-air.
Electrical connection
Diagram
Volume ow V [m
3
/h]
Diff. pressure ΔP [hPa]
Ø 50
Ø 46
Ø 40
Ø 40
P1 (+)
P2 (-)
103
(128)
180
Dimensions in mm
Technical Data
Pressure connection P1 screw neck M10 x 1
P2 connection adapter ø 6.5 mm (0.3 in)
Mounting position Any, but as near as possible to the purge-air inlet of the
measuring system
Pressure setting range 5 ... 25 hPa (0.07 ... 0.3 psi); tolerance ±15 %
Switching difference 1 hPa (0.02 psi)
Max. operating pressure 100 hPa (1.5 psi)
Temperature range –20 ... +85 °C (–4 ... 185 °F)
Electrical contact rating 250 V AC; 6 A
Electrical connection AMP flat plug 6.3 x 0.8 mm
2
(DIN 46244)
Hose connection ø 40 mm (1.6 in)
Protection class IP 54
Connection Wiring
Throw over switch
Increasing pressure NC opens, NO closes
Decreasing pressure NO opens, NC closes
8007948/2009-03 ∙ 3M ∙ Subject to change without notice
SICK AG | Waldkirch | Germany | www.sick.com
/