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

8 V

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

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

PF083A-E

61F-GP-

40 20

13 26

E3 E2

PF2

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)

712

38.5

PF1/2

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)

17 14

4860

20 dia.

Nut (M6)

Cast iron

26-dia. hole

Two, 6-dia. holes

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.

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.

PF113A-E

61F-03B

61F-04B

61F-03B

61F-04B

1 m1 m

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

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