Dwyer 204 - Manual

Operating Characteristics
When the float rises to the operating point, the switch or switch-
es are actuated by the mutual attraction between a magnetic
plunger attached to the float within the float chamber and a mag-
net attached to the switch operating assembly. When the float
drops, the magnetic plunger is moved out of the field of the mag-
net on the switch operating assembly and the switch or switches
are restored to their original position by gravity.
The magnetic plunger attached to the float moves within a tube
within the switch enclosure. The switch unit is mounted on the
tube singly or in pairs. Type 1271 - Single Stage Only.
Explanation of Type and Code Numbers
Example: Type 201G-4820-C1-60.
201 is the type number of the control; letter “G” denotes enclo-
sure; -4820 designates circuit arrangement; C1 denotes materials
of construction; 60 indicates pressure rating and specific gravity.
Enclosures
General Purpose enclosures are identified by the letter ‘G: in
type number as in 201G, 1273G.
Weather Resistant enclosures are identified by the letter “W” in
type number as in 204W, 211W.
Explosion-proof enclosures are identified by the letter”E” in type
number as in 201E, 1274E.
Explosion-proof -- Vapor-proof enclosures are identified by the
letters “EV” in type number as in 203EV, 223EV.
Special Features
Semi-Automatic (with manual reset) operates automatically on
level fall only - manual reset required on level rise. This operation
identified by the letters “RU” in type number as in 201GRU.
Wide Differential (Single Stage) available only for controls with
mercury switch contacts. Provides double the fixed level change
(“B: in Liquid Level Change Table) between on and off switch
operation. Identified by the letter “D” in type number as in 201GD.
Type 1271 Not Available.
440 Volt Service
Identified by the digit 5 in circuit specification No. such as in -
5820, -5821. For two-stage operation 440V is limited to SP-ST in
each stage.
Location -- Mounting
Select location recommended by equipment manufacturer. Mount
all controls vertically and be sure that control switch mechanism is
level.
Wiring
Wire in accordance with local electrical codes or follow equipment
manufacturer’s instructions.
Align wiring block to face conduit opening and tighten brass screw
of switch assembly.
The 3/4˝ NPT conduit connection (on all types can be rotated 360°
to facilitate wiring.
Do not overload electrically. See rating stamped on nameplate.
Operating Adjustments
Level Adjustment (Single Stage Only) Types 201, 203, 204, 211,
213, 214, 221, 223, 224, and 251, 253, 254 only. When single
stage controls are shipped from the factory, the switch operating
mechanism (illustration No. 11) is positioned at the center of the
armature tube. The operating level can be raised approximately
one inch by moving switch mechanism up to the top of the arma-
ture tube. Operating level may also be lowered one inch by mov-
ing switch mechanism down to bottom of armature tube. To obtain
either operation, loosen clamp screw (illustration No. 11) before
raising or lowering switch assembly. Be sure to tighten clamp
screw after the desired adjustment is made.
Type 1271, 1273, 1274 (Single Stage Operation) the switch oper-
ating mechanism must rest at the bottom of armature tube against
enclosure base.
Magnetic Type Liquid Level Contols
Series 201, 203, 204, 251, 253, 254, 1271, 1273, 1274 - Sealed Housing with Stainless Steel Float
Series 211, 213, 214, 221, 223, 224 - Flanged Steel Float Chamber with Removable Steel Float
Bulletin O-421C
MERCOID DIVISION
DWYER INSTRUMENTS, INC.
P.O. BOX 258 • MICHIGAN CITY, INDIANA 46361 U.S.A.
Phone: 219/879-8000 www.dwyer-inst.com
Fax: 219/872-9057 e-mail: [email protected]
Lit-by-Fax: 888/891-4963
Installation and Operating Instructions
LIQUID LEVEL CHANGES IN INCHES FOR SWITCH OPERATION
Series 201, 203, 204, 221, 223, 224, 251, 253, 254
Minimum Specific Gravity 0.6
Single Stage Operation
“A” is Adj. ±1˝
Single Stage with Wide
Differential “A” Not Adjustable
Sp. Gr.
1.0
.6
“A”
6-3/4˝
7-1/2˝
“B”
3/4˝
1˝
Code
C1-60
Sp. Gr.
1.0
.6
“A”
7-1/2˝
8-1/4˝
“B”
1-3/4˝
1-7/8˝
Code
C1-60
Two Stage Operation
“A”- Not Adjustable
Sp. Gr.
1.0
.6
“A”
5-3/4˝
6-1/2˝
“B”
3/4˝
1˝
“C”
7-3/4˝
9˝
“D”
1˝
1-3/4˝
“E”
2˝
2-1/2˝
Code
C1-60
See Illustration No. 10
TYPES TYPES TYPES
201
251
1271
203
253
1273
204
254
1274
TYPES TYPES TYPES
211
221 213
223 214
224
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