Dwyer Flex-Tube?/sup> Well Type Manometers are designed to meet the need for a 
direct reading single column instrument providing highly accurate pressure 
readings; positive, negative or differential. Unlike other makes, Dwyer 
manometers have no hidden wells or packing glands. These instruments are 
constructed of shatter-proof clear plastic permanently bonded to well 
assemblies with leakproof glued joints. Well assemblies are precisely machined 
from solid acrylic plastic. Overpressure safety traps assure protection against 
loss of fluid. Heavy pure white acrylic plastic scales have sharp black silk 
screen figures and graduations sealed with clear mylar coating. Scales are 
adjusted with quick-acting positive mechanism. Heavy heat treated aluminum back 
plated have durable gray hammerloid finish. These manometers are rated to 100 
psig (6.89 bar). Not recommended for vacuum service beyond 5 in. Hg (68 in 
w.c.) 

SERIES NO. 1230 MANOMETERS (wall mounting type), Fig. 9-1, have mounting holes
 for easy installation. They may also be used as portable manometers and can be 
hung or attached to any vertical steel surface by magnetic mounting clips. All 
parts are fully visible and readily accessible for cleaning. 

SERIES NO. 1235 MANOMETERS (panel mounting type), Fig. 9-2. All pressure 
connections are made from the back, with the micrometer zero scale adjustment 
in front at the base of the liquid column. 

MULTI-TUBE MANOMETERS, of the same design as the No. 1235 series, are available 
with any number of tubes mounted on with all pressure connections made from the 
back. Reading columns are on 1 ? centers. 

SPECIAL SCALES Psi and metric scales, available in aluminum panel. Higher 
ranges and other special scales in Benelex panel. 

STANDARD ACCESSORIES: include one set of type "a" connections, .826 sp. Gr. Red 
gage oil for "D" style or fluorescein green dye concentrate with wetting agent 
for "W/M" styles, two 3 ft. length of clear vinyl tubing and two 1/8" NPT 
tubing adapters. 

TO ORDER:
Please indicate scale desired. Specify "WM" with Model Number for inches of 
water, using water or inches of mercury, using mercury; and "D" for inches of 
water using .826 sp. Gr. Red gage oil. Red gage oil is often preferred for 
readings in inches of water because of the longer scale and slower evaporation 
rate. This lessens the need for frequent re-zeroing and refilling. If not 
otherwise indicated, "WM" style manometers will be shipped.