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FILLING
Using 1 quart distilled water, add 3/4 oz bot-
tle of Dwyer A-126 Fluorescein green color
concentrate. Remove a tubing connector
from the manometer and pour fluid in to mid-
point level. Shake to remove air bubbles and
slide scale so zero mark is in line with the
meniscus of the two fluid columns.
For readings in inches of mercury, fill with
13.6 sp. gr. triple distilled mercury. When
used with mercury, some discoloration of the
vinyl tubing will normally occur.
READING
Connect the manometer to the source of
pressure, vacuum or differential pressure.
When the pressure is imposed add the num-
ber of inches one column travels up to the
amount the other column travels down to
obtain the pressure reading. If the reading is
desired in other units the conversion chart
may be used.
Should one column travel further than the
other column, due to minor variations in the
tube I.D. or to pressure imposed, the accu-
racy of the pressure reading thus obtained is
not impaired. The U-tube manometer is a
primary measuring device indicating pres-
sure by the difference in the height of two
columns of fluid. The fact that one column
travels further than the other does not affect
the accuracy of the reading.
CLEANING
Cleaning can best be accomplished with a
little pure soap and water. Avoid liquid soaps
and solvents. Flush thoroughly with clear
water to remove all soap. Dry completely
before refilling with mercury.
©Copyright 2007 Dwyer Instruments, Inc.
DWYER INSTRUMENTS, INC.
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46361, U.S.A.
Slack-Tube
ed with cross-sectional view of
molded unbreakable Acrylic plastic
top, connectors and over pressure
traps.
OPERATING RANGES
Model
Range, In.
1211-8
4-0-4
1211-12
6-0-6
1211-16
8-0-8
1211-24
12-0-12
1211-30
15-0-15
1211-36
18-0-18
1211-48
24-0-24
1211-60
30-0-30
1211-72
36-0-36
1211-120
60-0-60
Metric
Range,CM
1211-50
25-0-25
1211-100
50-0-50
1211-200
100-0-100
Printed in U.S.A. 8/07
Phone: 219/879-8000
Fax: 219/872-9057 e-mail: info@dwyer-inst.com
Bulletin D-20
page 2
®
Manometer extend-
Hg Req'd
(oz.)
6
7
9
12-
⁄
1
2
15
17-
⁄
1
2
22-
1
⁄
2
27
32
57
Hg Req'd
(oz.)
11
18-
⁄
1
2
35
FR# 45-440214-00 Rev. 5
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