Dwyer 3000MR - Manual (Page 2)

DWYER INSTRUMENTS, INC.
Phone: 219/879-8000 www.dwyer-inst.com
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46361, U.S.A. Fax: 219/872-9057 e-mail: [email protected]
INSTALLATION
1. LOCATION: Select a location where the temperature of the
unit will be between 20°F and 120°F (-6.67 to 48.9°C). The
tubing feeding pressure to the instrument can be run prac-
tically any length required but long lengths will increase
response time slightly. Avoid surfaces with excessive vibra-
tion.
2. POSITION: All standard models are calibrated with the
diaphragm vertical and should be used in that position for
maximum accuracy. If your application requires mounting in
other than a vertical position, be sure to specify this when
ordering.
3. PRESSURE CONNECTIONS: For convenience, two sets
of 1/8˝ female NPT ports are available. Plug the unused set
with pipe plugs provided. Attach tubing from positive pres-
sure source to port marked “HI” or from negative (Vacuum)
source to port marked “LOW”. In either case, opposite port
must be vented to atmosphere. In dusty environments, we
recommend use of an A-331 Filter Vent Plug to keep interi-
or of instrument clean. For differential pressures the higher
source is connected to the “HI” port and lower to the “LOW”
port.
4. MOUNTING: The Photohelic ® Switch/Gage may be either
panel mounted or surface mounted.
A. PANEL MOUNTING: Cut a 4-3/4˝ or 120mm dia. hole in
panel and insert the complete unit from the front. Slip on
the mounting ring and install the split snap ring in the
groove on the bezel. Seat the mounting ring against the
snap ring and thread the four screws through the tapped
holes. Tighten screws against rear of panel.
B. SURFACE MOUNTING: Drill (3) 3/16˝ dia. holes for
mounting screws and (1) 7/8˝ dia. hole for wire assembly as
shown in hole location drawing. Insert screws from rear of
panel and thread into tapped holes on back of Photohelic
®
Switch/Gage case. If rear pressure connections are to be
used, make 1/2˝ dia. holes located as shown in hole loca-
tion drawing in left column.
Once Photohelic ® Switch/Gage unit is securely mounted, plug
wire assembly into 9 pin connector on rear of unit, being care-
ful to match pin locations.
5. ZEROING: Once the Photohelic ® Switch/Gage is mounted
in its final position, check to be sure pointer aligns with zero
on scale, when no pressure is applied and both low and
high pressure ports are vented to atmosphere. To adjust,
turn small slotted screw at center-bottom of gage face.
MAINTENANCE
Upon final installation of the Dwyer
® Photohelic ® Switch/Gage,
no routing maintenance is required. A periodic check of system
calibration is recommended.
The Series 3000MR Photohelic ® Differential Pressure
Switch/Gage is not field serviceable and should be returned if
repair is needed (field repair should not be attempted and may
void warranty). Be sure to include a brief description of the
problem plus any relevant application notes. Contact customer
service to receive a return goods authorization number before
shipping.
©Copyright 2009 Dwyer Instruments, Inc. Printed in U.S.A. 7/09 FR# 13-440622-00 Rev. 5
Ø4-3/4 [120.65] HOLE
SNAP RING
GROOVE
PNEUMATIC
PRESSURE TAPS
Ø7/8 [22.23] HOLE IN
PANEL FOR WIRE
CONNECTION
1-1/8
[28.58]
1-1/8
[28.58]
11/16
[17.46] Ø1/2 [12.70] HOLE FOR
HIGH PRESSURE CONNECTION
1-3/4
[44.45]
1/2
[12.70]
(3) Ø3/16 [4.77] HOLES
EQUALLY SPACED ON A
4-1/8 [104.78] B.C.
Ø1/2 [12.70] HOLE FOR
LOW PRESSURE CONNECTION
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