Instruction Manual

BULLETIN E-81-DPL
Model DPL Dual Point Level Switch
Specifications– Installation and Operating Instructions
DWYER INSTRUMENTS, INC. Phone: [phone] www.dwyer-inst.com
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46361, ,U.S.A. Fax: [phone] e-mail: [e-mail]
Lit-By Fax: [phone]
DESCRIPTION
Maintain liquid level high and low limits with the Model
DPL Dual Point Level Switch. Units can be used for sin-
gle or dual point level control in semi-solid liquids, in-
dustrial slurries or heavy-bodied liquids like wastewater.
Standar 24 inch electrodes can be cut by the end-user to
a shorter length or lengthened by adding up to two 24
inch extensions (sold separately) to reach the maximum
recommended length of 72 inches. Model DPL contains
no moving parts to get stuck or wear out. Controller fea-
tures adjustable sensitivity and DIN rail-mountable sock-
et mount.
INSTALLATION
Conductivity Probes
1. Probes can be cut to length. Remove probes from
sensor head by carefully unthreading them from
inserts. Do not overtighten when re-installing.
2. Cut two (2) probes to the same length, these will be
the common and lower level probes. See figure 1.
3. Cut one (1) probe to the desired length for the upper
level of the tank. See figure 1.
4. Spacer should be located approximately 1 inch
(25.4 mm) from bottom of shortest probe.
5. If build up occurs on probes a short circuit could
occur. If this happens apply shrink tubing to the
probes leaving the last
1
/ 2 inch (12.7 mm) bare.
Wiring (from sensor head to controller)
1. Install cable into sensor head through the compres-
sion fitting supplied.
2. Attach the black lead between the common probe
terminal and terminal five (5) on the socket mount.
See figure 2.
27.050
[687.07]
24.000
[609.60]
1" NPT
0.125
[3.18]
3.110
[78.99]
2.385
[60.58]
Ø2.260
[57.04]
1.395
[35.43]
3.731
[94.78]
2.810
[71.37]
2.250
[57.15]
1.750
[44.45]
PHYSICAL DATA
Electrodes:
1
/
8
ⴖ dia, 24⬙ length, standard.
Wetted Parts: 316 Stainless Steel, polypropylene. All
food grade materials.
Mounting, Sensor Head: 1⬙ NPT.
Maximum Pressure: 30 psig (2.06 bar).
Maximum Operating Temperature: 212˚F (100˚C) .
Connecting Cable, Probe to Controller: 10 ft (3.0 m).
Sensing Voltage: 12 VAC.
Probe Sensitivity: Adjustable to 100,000 Ohms
Power Supply: 120 VAC 50/60 Hz.
Output: SPDT, 5 Amps @ 240 VAC.
Probe Enclosure: IP68 (NEMA 6).
Maximum Probe Length: 72ⴖ (1.8 m) with optional
extensions.
Mounting, Controller: Standard octal socket or 35mm
DIN rail.
Electrical Connections: Screw terminals located on
socket mount.
Weight, Probe Assembly: 1.5 lbs (0.68 kg).
Weight, Controller: 1.0 lb (0.45 kg).
Upper
Level
Lower
Level
Common
Level
Spacer
Figure 1