Mercoid D Series Specifications-Installation And Operating Instructions

Series "D" Pressure Controls with Mercury Switches
Specifications - Installation and Operating Instructions
Mercoid Series "D" Pressure Controls Bourdon tube power elements, visible
setpoint, adjustable deadband or fixed deadband and pressure ranges from 0 to 30 in
Hg VAC to 800 to 8000 psig (345 bar).
BENEFITS/FEATURES
• Visible calibrated dial
• On/off indication
• Adjustable, fixed deadband, or manual reset
• External switch setpoint adjustments
• Minimum deadband is obtainable at any point in the range
• Pressure Ranges of full vacuum to 8000 psig.
• UL listed, CSA approved. Many models FM approved.
• General purpose, weatherproof or explosion-proof enclosures
• Single or two stage operation
Location and Mounting
Select a location that is recommended by equipment manufacter and reasonably
free from vibration caused by reciprocating or rotating machinery. Where excessive
vibration occurs, use a remote connection and mount by means of a mounting bracket
or separable flange (available on order). When in doubt about excessive vibration,
use a remote connection. Where pulsations, pres-sure surges, or water hammer
are present, protect the control with a surge tank or scrubber. Mount all controls
vertically and level.
General Purpose Controls: Install controls prefixed by the let-ters DA, DAF, DRF, DL,
DS, DSF, firmly in a level position. Do not mount the control by twisting the case; use
a wrench on the square part of the 1/4˝ bottom pipe connection. To level, sight across
the two cover screws or check the lower end of the glass opening in the cover to see
that the control is lined up horizontal-ly. On general purpose controls provided with a
flange, mount by means of the three holes in the flange.
DWYER INSTRUMENTS, INC.
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A.
2-1/4 [57.15]
Ø6-1/64
[152.8]
1/4 NPT
7/8
[22.23]
1/4 NPT
1-1/8
1-1/2 [38.10]
[28.58]
1/4 NPT
General purpose
[3] Ø13/64 [5.159]
Ø6-1/2 [165.1]
General purpose with flange for surface mounting
SPECIFICATIONS
Wetted Materials: Brass, 403 SS, or 316 SS.
Temperature Limit: 180°F (82°C).
Pressure Limit: Maximum pressure of the operating range. Enclosure rating:
General purpose, weatherproof or explosion-proof.
Repeatability: ±1% of full operating range.
Switch Type: See circuit chart.
Electrical Rating: See electrical ratings chart.
Electrical Connections: Screw terminal.
Conduit Connection: General purpose: 1/2˝ hole for conduit hub. Weatherproof:
1/2˝ conduit hub. Explosion-proof: 3/4˝ female NPT.
Process Connection: General purpose and weatherproof: 1/4˝ male NPT, 1/2˝
male NPT on ranges 15S and 16S. Explosion-proof: 1/2˝ male NPT and 1/4˝ female
NPT.
Mounting Orientation: Vertical.
Set Point Adjustment: Thumbscrew.
Weight: General Purpose: 4 lb (1.8 kg), weatherproof: 6 lb (2.7 kg), explosion-
proof: 8 lb (3.5 kg).
Deadband: See ranges and differentials chart.
ACCESSORIES
Remote Connection Mounting Bracket
No. 49-62 (300 psi) No. 33-25
No. 49-62HP (to 2500 psi)
Phone: 219-879-8000
Fax: 219-872-9057
Bulletin IN-0118
1-5/8
[41.28]
1/2˝ CONDUIT HOLE
ADJUSTMENT
5/8
SCREWS
[15.88]
HOLES FOR
FLANGE
SCREWS
1/2˝ CONDUIT
HOLE
Ø6-1/64 [152.8]
Pigtail Siphon
No. 42-52 (300 psi)
No. 42-58 (2,000 psi)
www.dwyer-inst.com
e-mail: info@dwyermail.com