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Conductive Level Controller
61F-GP-N8
Compact Plug-in Level Controllers for
Single or Two-point Level Cont rol o f
Conductive Materials (Liquids and
Solids)
Wide range of models: long-distance, high and
low-sensitivity, and two-wired types available.
24/100/110/120/200/220/230/240 VAC operation
possible.
Easy installation on DIN track.
Low-voltage (AC) electrodes.
Red LED operation indicator provided.
Conforms to EMC and LVD Directives.
UL/CSA approved.
Ordering Information
Model Number Legend:
61F-GP-N8j
123
1. Plug-in Type
2. Compact 8-pin Type
Accessories (Order Separately)
Selection Guide for Electrode Holders and Separators
Electrode Holders
Applications
Mounting style Flange Screw Flange Screw
Insulator material Phenol resin Phenol resin Ceramics Tef l on
Max. temperature 70°C 150°C (without water drips or vapor on
No. of
electrodes
For city water and
other general-use
electrodes. Easy-toreplace separate
versions facilitate
maintenance of electrodes.
1 --- --- BF-1 BS-1
3 PS-3S PS-31 --- ---
When mounting space
is limited. Special 3-pole
holder of small size and
light weight. Ideal for
soft drink vendors, etc.,
where only limited
space is available.
3. Applications
None: General-purpose type
L: Long-distance type
H: High-sensitivity type (reverse acting)
HY: High-sensitivity type (standard acting)
D: Low-sensitivity type
R: Two-wired type
For low specific liquids. Used for sewage, sea water, etc., having a low specific resistance. In sewage use, electrode holders must be installed 10 to
20 cm apart from one another. For
acids, alkalis and sea water, electrode
holders may be as much as 1 meter
apart to operate properly.
the surface of the electrode holder)
When resistance to
high pressure is required. Ideal for use
in tanks where temperature or pressure
inside the tank is
high, e.g. 250°C
250°C (without water
drips or vapor on the
surface of the
electrode holder)
RC
Electrode Separators
No. of electrodes
1 F03-14 1P
3 F03-14 3P
Model
1
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61F-GP-N8
Selection Guide for Electrodes, Connecting, and Lock Nuts
Applicable liquids Material Models for individual electrode assembly components
Electrode (1m long) Connecting nut Lock nut
Purified city water,
industrial water,
sewage
Purified city water,
industrial water,
sewage, dilute alkaline solution
Equivalent
to SUS 304
(AISI-304)
SUS316
(AISI-316)
Model Indication
mark
F03-01 SUS201 1 line F03-02 SUS201 --- F03-03 SUS201 ---
F03-01 SUS316 2 lines F03-02 SUS316 6 F03-03 SUS316 6
Model Inscription Model Inscription
Specifications
61F-GP-N8
Model/Items General-purpose
Controlling materials
and operating
conditions
Supply voltage 24, 100, 110, 120, 200, 220, 230 or 240 VAC; 50/60 Hz
Operating voltage range 85% to 110% of rated voltage
Interelectrode voltage 8VAC 24 VAC 8VAC
Interelectrode current Approx. 1 mA AC max. Approx.
Power consumption Approx. 3.5 VA max.
Interelectrode operate
resistance
Interelectrode release
resistance
Response time Operate: 80 ms max.
Cable length
(see note 2)
Control output 1 A, 250 VAC (Inductive load: cosφ =0.4)
Ambient temperature Operating: --10°Cto55°C
Ambient humidity Operating: 45% to 85% RH
Insulation resistance
(see note 3)
Dielectric strength
(see note 4)
Life expectancy Electrical: 100,000 operations min.
Controller
61F-GP-N8
For control of ordinary purified water
or sewage water
Approx. 0 to 4 kΩ Approx. 0 to 1.3 kΩ
Approx. 15 k to
∞ Ω
Release: 160 ms max.
1kmmax. 2kmmax.
3 A, 250 VAC (Resistive load)
100 MΩ max. (at 500 VDC)
2000 VAC, 50/60 Hz for 1 min.
Mechanical: 5,000,000 operations min.
Long-distance
Controllers
61F-GP-N8L 2KM
(for 2 km)
61F-GP-N8L 4KM
(for 4 km)
For control of ordinary purified water
in cases where the
distance between
sewage pumps and
water tanks or between receiver
tanks and supply
tanks is long or
where remote control is required.
(for 2 km)
Approx. 0 to 0.5 kΩ
(for 4 km)
Approx. 4 k to ∞ Ω
(for 2 km)
Approx. 0.5 k to
∞ Ω (for 4 km)
4kmmax.
High-sensitivity
Controllers
61F-GP-N8H
61F-GP-N8HY
(see note 1)
For control of liquids with high specific resistance
such as distilled
water
0.4 mA AC max.
Approx. 15 kΩ to
70 kΩ
(see note 3)
Approx. 300 k to
∞ Ω
50 m max. 1kmmax. 800 m max.
Low-sensitivity
Controller
61F-GP-N8D
For control of liquids with low specific resistance
such as salt water,
sewage water, acid
chemicals, alkali
chemicals
Approx. 1 mA AC max.
Approx. 0 to 1.3 kΩ Approx. 0 to 2 kΩ
Approx. 4 k to ∞ Ω Approx. 15 k to
Two -wir ed
Controller
61F-GP-N8R
For control of ordinary purified water
or sewage water
used in combination with two-wiredtype electrode
holder (incorporating a resistor of
6.8 kΩ)
∞ Ω
Note: 1. The relay in the 61F-GP-N8H de-energizes when there is water present across the electrodes, whereas the relay in the 61F-GP-
N8HY energizes when there is water present across the electrodes.
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61F-GP-N8
2. The length when using completely-insulated, 600-V, 3-conductor (0.75 mm2) cabtire cables. Usable cable lengths will become
shorter as the cable diameter or number of conductors becomes larger.
3. The insulation resistance and dielectric strength indicate values between power terminals and electrode terminals, between power
terminals and contact terminals, and between electrode terminals and contact terminals.
4. Possible to use with 10 kΩ or less, however, this may cause reset failure.
Internal Circuit Diagrams
61F-GP-N8/-N8L/-N8D/-N8HY 61F-GP-N8H
Power
supply
24 V
Control circuit
8 V (see note)
Power
supply
Note: 24 V for the 61F-GP-N8HY.
24 V
Control circuit
24 V
61F-GP-N8R
Power
supply
24 V
Control circuit
8V
Connections
61F-GP-N8
2
Automatic Water Supply and Drainage Control
1. Water Supply
Connect electromagnetic switch coil terminal A to terminal 2.
•
The pump stops when the water level reaches E1 and starts
•
when the water level drops below E2.
200-VAC power supply
MCCB
(See note 1
below.)
Contactor
THR
Reservoir
61F-GP-N8
(See note 2
below.)
2. Drainage
Connect the electromagnetic switch coil terminal A to terminal 3.
•
The pump starts when the water level reaches E1 and stops
•
when the water level drops below E2.
0V
200 V
Tank
8V
24 V
Control circuit
PS-3S
Stop
Start
Note: 1. The diagram shows the connections for water supply. When draining, change the connection from terminal 2 to terminal 3.
2. The earth terminal must be earthed.
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61F-GP-N8
Operation
The Conductive Level Controller consists of a plug-in controller connected to a set of stainless steel probes. These are cut to length and
inserted vertically into the liquid. A low voltage is applied between
these probes and the earth probe (or tank, if it is electrically conductive). The water provides a current between the earth probe and the
high-level probe. The output relay in the Controller is energized
when the water level reaches the high-level probe and de-energized
when the water level falls below it.
For two-point control a low-level probe is used as well. In this case
the relay does not de-energize until the water level falls below the
low-level probe. Using the low-level probe allows a wide differential
between switching a pump on and off, and can avoid excessive
pump operation during tank emptying or filling. If this differential is
not required, the low-level probe need not be connected.
Surge Suppressor Unit (61F-03B/04B)
A high-capacity protective device is available which protects
61F-series Floatless Level Controllers against faults arising from
electrical surges (such as indirect strokes of lightning) when the
Controllers are employed in elevated water tanks or in high-altitude
locations.
Specifications
Discharge start voltage
Impulse withstand voltage 200,000 V (1 x 40 µs)
Impulse withstand current 6,000 A (1 x 40 µs)
Internal Connections
61F-03B
90 V ±20 VDC
61F-04B
3. When connecting the Surge Suppressor Unit, wire as shown
in the following example (with three electrodes).
Ground
61F-GP-N8
61F-03B
Ground
E1
E2
E3
Precautions
1. Mount the Surge Suppressor Unit as close to the Controller
as possible.
2. When grounding the Surge Suppressor Unit in the vicinity of
the Controller, connect the ground side of the Surge
Suppressor Unit to electrode E3.
Long distance
61F-03B
Ground
Connection Sockets
PF113A-E Track-mounted Socket
PL11 Back-connecting Socket
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61F-GP-N8
Dimensions
Note: All units are in millimeters unless otherwise indicated.
Electrode Holders
PS-3S
PF2 parallel thread
9-dia. rubber
bushing (inner)
(effective dia.: 58.135)
80
13
40
20
Mounting Holes Screw Holes
PS-3S/-3SR PS-4S/-4SR PS-5S/-5SR
34 dia.
E2
92
E1
E3
8026
E3 E2
E4
E1
61F-GP-N8
61F-GP
-N8
PF083A-E
E2
E3
E1
E4
91
PS-31
Dust preventive rubber cap (optional)
BF-1
Used with coupling Used with mounting brack et
PF2
38.5
11
32
712
33
dia.
Rubber
packing
3
(see note)
Electrode
SUS304
M3
Note: Standardhol der c onstruction includes three i ntegral 300-mm-longelec-
trodes. However, a model having 1,000-mm-long electrodes is available on request.
48
60
65-dia. hole
PF1/2 Parallel thread
4dia.
Terminal bolt
SUS201 (M6)
Nut (M6)
(49)
72
26
29.5 dia.
Cast iron
20 dia.
18
2317 14
11 d i a.
Two M 5 x 25
mounting
screws
Mounting Holes
PF1/2
26-dia. hole
48
Two, 6-dia. holes
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61F-GP-N8
BS-1
Terminal bolt
SUS304 (M4) P=0.7
Width across flats: 20
M18
P=1.5
Two M 4
P=0.7
61F-GP-N8
24 dia.
Electrode Separators
F03-14 1P (for Single Pole)
6.5 dia.
28 dia.
Connecting Sockets
Track Mounted Socket
PF083A-E
Eight, M3.5 x 7
sems screws
52 max.
Two, 4.2-dia.
holes
25 dia.
Nut (iron)
12 39
5150
101
F03-14 3P (for Three Poles)
Three, 7 dia.
41 dia.
Terminal Arrangement/
Internal Connections
(Top View)
M18 P=1.5
(fine sc rew thread )
20
Mounting Holes
Two, M4 or 4.5-dia. holes
Back Connecting Socket
PL08
50.5 max.
41 max.
35 max.
30 dia.
21 max.
Approx. 20.5
Two, 2-dia. holes
Terminal arrangement/
Internal Connections
(Bottom View)
Mounting Holes
Two, 3.5-dia. or
M3 Controller
mounting holes
Two, 3.5-dia. or M3
socket mounting holes
31-dia.
hole
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61F-GP-N8
Holding Brackets
To mount the 61F-GP-N8 Conductive Level Controller on the
PF083A Track Mounted Socket, use the PFC-N8 Mounting Brackets attached to the Socket as an accessory.
PFC-N8
Approx.
80
Surge Suppressor Unit
61F-03B
61F-04B
61F-GP-N8
61F-03B
61F-04B
Precautions
How to Mount Electrodes
Connecting Electrodes to Electrode Holders
Electrode holde r
Clamp screw
Connecting nut
1. Spin a lock nut and a spring
washer onto the electrode.
Lock nut
Electrode
2. Fully fit the electrode into the
connecting nut attached to the
electrode holder.
Connecting One Electrode to Another
Electrode
Lock nut
Spring washer
Connecting nut
Spring
washer
3. Tighten the electrode with
the two clamp screws.
Spring washer
4. Secure the connecting
nut by tightening the lock
nut and spring washer.
2. Fully fit the
electrode into the
connecting nut
attached to the
electrode holder.
3. Tighten the electrode with
the two clamp screws.
4. Secure the connecting
nut by tightening the lock
nut and spring washer.
PF113A
1. Spin a lock nut and a spring
washer onto the electrode.
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61F-GP-N8
Application Examples
•
Level control in tanks, reservoirs, sewage plants, underground
wells, mixing plants etc.
•
Level control for element protection in pipes, channels, and
irrigation systems.
•
Flow detection in pipes, channels, and irrigation systems.
•
Ice bank control in cold drink dispensers, ice makers, water
chillers, bulk milk tanks, etc.
Application
When using electrodes in sea water or sewage, provide a sufficient
interval (normally 1 m) between the electrodes. If the sufficient interval cannot be provided, employ a low-sensitivity-type Floatless Level Controller.
When taping one of the electrodes to prevent it from contacting the
other electrodes in water, do not tape the electrode entirely but
leave at least 100 mm of its end uncovered.
When the required length of the electrode is more than 1 m, use a
separator at each joint of two electrodes so as to prevent the electrodes from contacting one another.
Note: Avoid use of the separators in dust-containing liquids.
Usually, electrodes are used in a set of three: long, medium, and
short. Connect the short electrode to E1, the medium electrode to
E2, and the long electrode to E3. Make E3 at least 50 mm longer
than E2.
61F-GP-N8
•
Dispensing of liquids by volume.
•
Indication of liquid buildup due to filter blockages.
•
Pollution/foul water detection for rivers, drains, etc.
•
Alarm control warning of abnormal or dangerously high or low
levels.
Note that the 61F-GP-N8 Conductive Level Controller is capable of
controlling liquids with specific resistances of up to 30 kΩ-cm when
the Controller employs a PS-3S electrode holder with the electrode(s) submerged to a depth of 30 mm max.
Kind of water
City water 5to10kΩ-cm Standard type
Well water 2to5kΩ-cm Standard type
Industrial water 5to15kΩ-cm Standard type
Rainwater 15 to 25 kΩ-cm Standard type
Sea water 0.03 kΩ-cm Low-sensitivity type
Sewage 0.5to2kΩ-cm Low-sensitivity type
Distilled water 100 kΩ-cm or less High-sensitivity type
Specific
resistance
Over 100 kΩ-cm Consult OMRON
Applicable type
E1
E2
E3
1m1m
Electrodes are in actual contact with the liquid. Standard electrodes
are made of stainless steel and usable in purified water, sea water,
sewage, acid (except acetic acid, sulfuric acid, etc.) and alkaline liquids, although they may corrode depending upon the temperature
and working conditions.
Min
50mm
ALL DIMENSIONS SHOWN ARE IN MILLIMETERS.
To convert millimeters into inches, multiply by 0.03937. To convert grams into ounces, multiply by 0.03527.
Cat. No. F43-E1-1A In the interest of product improvement, specifications are subject to change without notice.
OMRON Corporation
Industrial Devices and Components Division H.Q.
Supervisory Control Devices Division
28th Fl., Crystal Tower Bldg.
1-2-27, Shiromi, Chuo-ku,
Osaka 540 Japan
Phone: 81-6-949-6035 Fax: 81-6-949-6069
8
Printed in Japan
1297-2M (1097)
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