Omron 61F-GP-N8 - User manual

Conductive Level Controller 61F-GP-N8 E-5
Level
Controllers
Conductive Level Controller
61F-GP-N8
Compact Plug-in Level Controllers for Single
or Two-point Level Control of 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.
Model Number Structure
■Model Number Legend
1. Plug-in Type
2. Compact 8-pin Type
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
Ordering Information
■List of Models
1 2 3
61F-GP-N8@
Application Model number
General-purpose type 61F-GP-N8
Long-distance type 2 km 61F-GP-N8L 2KM
4 km 61F-GP-N8L 4KM
High-sensitivity type 61F-GP-N8H
Low-sensitivity type 61F-GP-N8D
Two-wired type 61F-GP-N8R

E-6 Conductive Level Controller 61F-GP-N8
■Accessories (Order Separately)
Selection Guide for Electrode Holders and Separators
Electrode Holders
Electrode Separators
Selection Guide for Electrodes, Connecting, and Lock Nuts
Applications For city water and other
general-use electrodes.
Easy-to-replace sepa-
rate versions facilitate
maintenance of elec-
trodes.
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 avail-
able.
For low specific liquids. Used for sewage,
sea water, etc., having a low specific resis-
tance. In sewage use, electrode holders
must be installed 10 to 20 cm apart from
one another. For acids, alkalis and sea wa-
ter, electrode holders may be as much as
1 meter apart to operate properly.
When resistance to high
pressure is required. Ide-
al for use in tanks where
temperature or pressure
inside the tank is high,
e.g. 250°C
Mounting style Flange Screw Flange Screw
Insulator material Phenol resin Phenol resin Ceramics Teflon
Max. temperature 70°C150°C (without water drips or vapor on the
surface of the electrode holder)
250°C (without water
drips or vapor on the sur-
face of the electrode
holder)
No. of
electrodes 1--- --- BF-1 BS-1
3PS-3S PS-31 --- ---
No. of electrodes Model
1 F03-14 1P
3 F03-14 3P
Applicable liquids Material Models for individual electrode assembly components
Electrode (1m long) Connecting nut Lock nut
Model Indication
mark Model Inscription Model Inscription
Purified city water,
industrial water,
sewage
Equivalent
to SUS 304
(AISI-304)
F03-01 SUS201 1 line F03-02 SUS201 --- F03-03 SUS201 ---
Purified city water,
industrial water,
sewage, dilute
alkaline solution
SUS316
(AISI-316) F03-01 SUS316 2 lines F03-02 SUS316 6 F03-03 SUS316 316

Conductive Level Controller 61F-GP-N8 E-7
Level
Controllers
Specifications
■Ratings and Characteristics
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.
2. The length when using completely-insulated, 600-V, 3-conductor (0.75 mm2) cabtyre 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 ter-
minals and contact terminals, and between electrode terminals and contact terminals.
4. Possible to use with 10 kΩor less, however, this may cause reset failure.
Model/Items General-purpose
Controller
61F-GP-N8
Long-distance
Controllers
61F-GP-N8L 2KM
(for 2 km)
61F-GP-N8L 4KM
(for 4 km)
High-sensitivity
Controllers
61F-GP-N8H
61F-GP-N8HY
(see note 1)
Low-sensitivity
Controller
61F-GP-N8D
Two-wired
Controller
61F-GP-N8R
Controlling materials and
operating conditions For control of ordinary purified water or sew-
age water
For control of ordinary
purified water in cas-
es where the distance
between sewage
pumps and water
tanks or between re-
ceiver tanks and sup-
ply tanks is long or
where remote control
is required.
For control of liquids
with high specific re-
sistance such as dis-
tilled water
For control of liquids
with low specific re-
sistance such as salt
water, sewage water,
acid chemicals, alkali
chemicals
Forcontrol of ordinary
purified water or sew-
age water used in
combination with two-
wired-type electrode
holder (incorporating
a resistor of 6.8 kΩ)
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 8 VAC 24 VAC 8 VAC
Interelectrode current Approx. 1 mA AC max. Approx.
0.4 mA AC max.
Approx. 1 mA AC max.
Power consumption Approx. 3.5 VA max.
Interelectrode operate
resistance Approx. 0 to 4 kΩApprox. 0 to 1.3 kΩ (for 2 km)
Approx. 0 to 0.5 kΩ
(for 4 km)
Approx. 15 kΩto
70 kΩ
(see note 3)
Approx. 0 to 1.3 kΩApprox. 0 to 2 kΩ
Interelectrode release
resistance Approx. 15 k to ∞Ω Approx. 4 k to ∞Ω(for 2 km)
Approx. 2.5 k to ∞Ω
(for 4 km)
Approx. 300 k to ∞Ω Approx. 4 k to ∞Ω Approx. 15 k to ∞Ω
Response time Operate: 80 ms max.
Release: 160 ms max.
Cable length
(see note 2) 1 km max. 2 km max. 4 km max.
50 m max. 1 km max. 800 m max.
Control output 1 A, 250 VAC (Inductive load: cosφ= 0.4)
3 A, 250 VAC (Resistive load)
Ambient temperature Operating: −10°C to 55°C
Ambient humidity Operating: 45% to 85% RH
Insulation resistance
(see note 3) 100 MΩmax. (at 500 VDC)
Dielectric strength
(see note 4) 2000 VAC, 50/60 Hz for 1 min.
Life expectancy Electrical: 100,000 operations min.
Mechanical: 5,000,000 operations min.

E-8 Conductive Level Controller 61F-GP-N8
Connections
■Internal Circuit Diagrams
■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.
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.
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.
24 V
24 V
24 V 24 V
8 V
2
Control circuit
Control circuit
8 V (see note)
61F-GP-N8/-N8L/-N8D/-N8HY 61F-GP-N8H 61F-GP-N8R
Note: 24 V for the 61F-GP-N8HY.
Control circuit
Power
supply
Power
supply
Power
supply
0 V
200 V
8 V
24 V
61F-GP-N8
MCCB
Tank
Stop
Start
Reservoir
THR
PS-3S
200-VAC power supply
Contactor
Control circuit
(See note 1
below.)
(See note 2
below.)

Conductive Level Controller 61F-GP-N8 E-9
Level
Controllers
Operation
The Conductive Level Controller consists of a plug-in controller con-
nected 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 conduc-
tive). 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 electri-
cal surges (such as indirect strokes of lightning) when the Controllers
are employed in elevated water tanks or in high-altitude locations.
Specifications
Internal Connections
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.
3. When connecting the Surge Suppressor Unit, wire as shown in
the following example (with three electrodes).
Connection Sockets
PF113A-E Track-mounted Socket
PL11 Back-connecting Socket
Discharge start voltage 90 V ±20 VDC
Impulse withstand voltage 200,000 V (1 x 40 µs)
Impulse withstand current 6,000 A (1 x 40 µs)
61F-03B 61F-04B
Long distance
Ground
61F-03B
E1
E2
E3
Ground
Ground
61F-03B

E-10 Conductive Level Controller 61F-GP-N8
Dimensions
Note: All units are in millimeters unless otherwise indicated.
Electrode Holders
PS-@S
PS-31
BF-1
91
PF083A-E
61F-GP-
N8
80
40 20
13 26
92
E2
E1
E3
E1
E3 E2
E4
E2
E3
E4
E1
PF2
80
34 dia.
65-dia. hole
Used with coupling Used with mounting bracket
PS-3S/-3SR PS-4S/-4SR PS-5S/-5SR
Mounting Holes Screw Holes
9-dia. rubber
bushing (inner)
PF2 parallel thread
(effective dia.: 58.135)
11
3
712
32
38.5
26
PF1/2
M3
Dust preventive rubber cap (optional)
11 dia.
29.5 dia.
PF1/2 Parallel thread
4 dia.
Mounting Holes
(see note)
Electrode
SUS304
Rubber
packing
Note: Standard holder construction includes three integral 300-mm-long elec-
trodes. However, a model having 1,000-mm-long electrodes is available
on request.
(49)
48
18
23
17 14
72
4860
20 dia.
Nut (M6)
Cast iron
26-dia. hole
Two, 6-dia. holes
33
dia.
Terminal bolt
SUS201 (M6) Two M5 x 25
mounting
screws

Conductive Level Controller 61F-GP-N8 E-11
Level
Controllers
BS-1
Electrode Separators
F03-14 1P (for Single Pole) F03-14 3P (for Three Poles)
Connecting Sockets
Track Mounted Socket
Back Connecting Socket
12 39
5150
101
M18
P = 1.5
24 dia.
Width across flats: 20
Nut (iron)
Terminal bolt
SUS304 (M4) P=0.7
Two M4
P = 0.7
M18 P=1.5
(fine screw thread)
6.5 dia.
28 dia.
20
41 dia.
Three, 7 dia.
7±0.2
PF083A-E
Mounting Holes
Two, M4 or 4.5-dia. holes
52 max.
41 max.
21 max.
25 dia.
Eight, M3.5 x 7
sems screws
Two, 4.2-dia.
holes
Terminal Arrangement/
Internal Connections
(Top View)
50.5 max.
35 max.
30 dia.
Two, 2-dia. holes
Approx. 20.5
PL08
Mounting HolesTerminal arrangement/
Internal Connections
(Bottom View)
Two, 3.5-dia. or
M3 Controller
mounting holes
Two, 3.5-dia. or M3
socket mounting holes
31-dia.
hole

E-12 Conductive Level Controller 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.
Surge Suppressor Unit
Application Examples
•Level control in tanks, reservoirs, sewage plants, underground
wells, mixing plants etc.
•Level control for element protection in pipes, channels, and irriga-
tion systems.
•Flow detection in pipes, channels, and irrigation systems.
•Ice bank control in cold drink dispensers, ice makers, water chillers,
bulk milk tanks, etc.
•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 lev-
els.
■Application
When using electrodes in sea water or sewage, provide a sufficient
interval (normally 1 m) between the electrodes. If the sufficient inter-
val 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 elec-
trodes 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.
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 liq-
uids, although they may corrode depending upon the temperature
and working conditions.
PFC-N8
Approx.
80
PF113A-E
61F-03B
61F-04B
61F-03B
61F-04B
1 m1 m
E1
E2
E3 Min
50 mm

Conductive Level Controller 61F-GP-N8 E-13
Level
Controllers
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 elec-
trode(s) submerged to a depth of 30 mm max.
Precautions
■How to Mount Electrodes
Connecting Electrodes to Electrode Holders
Connecting One Electrode to Another
Kind of water Specific resistance Applicable type
City water 5 to 10 kΩ-cm Standard type
Well water 2 to 5 kΩ-cm Standard type
Industrial water 5 to 15 kΩ-cm Standard type
Rainwater 15 to 25 kΩ-cm Standard type
Sea water 0.03 kΩ-cm Low-sensitivity type
Sewage 0.5 to 2 kΩ-cm Low-sensitivity type
Distilled water 100 kΩ-cm or less High-sensitivity type
Over 100 kΩ-cm Consult OMRON
Electrode holder
Clamp screw
Connecting nut
Spring washer
Lock nut
Electrode
1. Spin a lock nut and a spring
washer onto the electrode.
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.
Electrode
Connecting nut
Spring washer
Lock nut
Spring
washer
1. Spin a lock nut and a spring
washer onto the electrode.
4. Secure the connecting
nut by tightening the lock
nut and spring washer.
3. Tighten the electrode with
the two clamp screws.
2. Fully fit the
electrode into the
connecting nut
attached to the
electrode holder.

E-14 Conductive Level Controller 61F-GP-N8
In the interest of product improvement, specifications are subject to change without notice.
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. F043-E1-02