APG NLS Operating Manual

AUT OMATION

Operator’s Manual

PRODUCTS

GROUP, INC.

NLS Series

Pneumatic Level Sensors

Rev . A1, 4/07

Automation Products Group, Inc.

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NLS Series Rev . A1, 4/07

Table of Contents

Warranty .............................................................................................................3

Speci cations ....................................................................................................4

Installation .........................................................................................................5

Wiring ..................................................................................................................7

Adjustment Procedure ..................................................................................7

Maintenance .....................................................................................................8

Life Expectancy ................................................................................................9

Spare Parts .........................................................................................................9

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Rev . A1, 4/07 NLS Series

• Warranty and Warranty Restrictions

APG warrants its products to be free from defects of material and workmanship
and will, without charge, replace or repair any equipment found defective
upon inspection at its factory, provided the equipment has been returned,
transportation prepaid, within 24 months from date of shipment from factory.

THE FOREGOING WARRANTY IS IN LIEU OF AND EXCLUDES
ALL OTHER WARRANTIES NOT EXPRESSLY SET FORTH HEREIN,
WHETHER EXPRESSED OR IMPLIED BY OPERATION OF LAW OR
OTHERWISE INCLUDING BUT NOT LIMITED TO ANY IMPLIED
WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A
PARTICULAR PURPOSE
.
No representation or warranty, express or implied, made by any sales
representative, distributor, or other agent or representative of APG which is
not specifi cally set forth herein shall be binding upon APG. APG shall not be
liable for any incidental or consequential damages, losses or expenses directly
or indirectly arising from the sale, handling, improper application or use of the
goods or from any other cause relating thereto and APG’s liability hereunder, in
any case, is expressly limited to the repair or replacement (at APG’s option) of
goods.

Warranty is specifi cally at the factory. Any on site service will be provided at
the sole expense of the Purchaser at standard fi eld service rates.

All associated equipment must be protected by properly rated electronic/
electrical protection devices. APG shall not be liable for any damage due
to improper engineering or installation by the purchaser or third parties.
Proper installation, operation and maintenance of the product becomes the
responsibility of the user upon receipt of the product.

Returns and allowances must be authorized by APG in advance. APG will
assign a Return Material Authorization (RMA) number which must appear
on all related papers and the outside of the shipping carton. All returns are
subject to the fi nal review by APG. Returns are subject to restocking charges as
determined by APG’s “Credit Return Policy”.

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NLS Series Rev . A1, 4/07

• Specifi cations

Operational Versions

NLS-1A: Standard media
NLS-1S: Corrosive media
NLS-3: Economic, light duty

Characteristics

Detection Range: 8-200 in. (200- 5000 mm)

1

Operating Point

: 80 ± 10 mm (NLS-1A) (SG = 1.0)
70 ± 10 mm (NLS-1S) (SG = 1.0)
65 ± 10 mm (NLS-3) (SG = 1.0)

2

Release Point

: 60 ± 15 mm (NLS-1A) (SG = 1.0)
50 ± 15 mm (NLS-1S) (SG = 1.0)
50 ± 15 mm (NLS-3) (SG = 1.0)

Max. Viscosity: 10 P (1/2 in. pipe); 30 P (1 in. pipe);
100 P (2 in. pipe); 250 P (5 in. pipe).
Switch Rating: 250 V 10 A AC; 115 V 0.5 A DC;
(Resistive Load) 230 V 0.05 A DC

Physical Attributes

Enclosure Protection: IP23 (NLS-1A); IP20 (NLS-1S; NLS-3)
Material:
Housing Cover: ADC (NLS-1A; NLS-1S); SS41 (NLS-3)
Housing: ADC (NLS-1A; NLS-1S); phenolic (NLS-3)
Chamber: ADC (NLS-1A); SCS13 (NLS3); phenolic (NLS-3)
Diaphragm; Neoprene (NLS-1A); NLS-3); Viton (NLS-1S)
Cable Entry: G 3/4 (NLS-1A); rubber bushing: (6 mm dia. hole)
Mounting: G1 male
Pipe Coupling: R 1/2 female

Notes:
1 Operating point means the position whereat the switch assumes ON as a

result of rise of level, such position being represented by dimensions from
the pipe end.

2 Returning point means the position whereat the switch assumes OFF as a

result of fall of level, such position being represented by dimensions from
the pipe end.

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Rev . A1, 4/07 NLS Series

• Installation

Unpacking

When unpacking, do not damage the sensor with mechanical shock. After
unpacking, make sure that products you ordered are complete. If any part is
missing, wrong or damage, please contact APG.

Installation

Install the sensor in an area which meets the following conditions:

• The ambient temperature range is 0 to +70°C (32 to 160°F).

• Humidity and vibration are low.

The NLS sensor should be installed in an area which meets the following
conditions:

• The ambient temperature range: 32 to 160°F (0 to 70°C).

• Located away from splashing liquid.

• No corrosive gases (such as NH

, SO2, CL2, etc.) present.

3

• Low humidity and vibration.

• Open container in nonhazardous area.

• Ample space for maintenance and inspection.

Install the NLS vertically from the container top. Provide a G 1 in. female
boss on the container top. Be sure to use a suitable gasket, O-ring, or thread
tape.

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NLS Series Rev . A1, 4/07

Notes:

• When the liquid is not SG = 1.0, divide the switch operating position or
switch release position with the actual SG.

Example: NLS-1A for SG = 0.8
Switch operating position: 80/0.8 = 100 mm
Switch release position: 60/0.8 = 75 mm

• When the detecting pipe is wider than 1/2 in., the switch operating
position drops.

To ensure proper operation, the following steps should be followed:

• Determine switch operation:

High level operation
Low level operation

• Determine where the actuation level should be:
Distances are measured from the inner surfaces of the mounting plug to
the end (inlet) of the detecting pipe.
For high level operation:
[actuation level] = [switch operating position] + 20 mm (screw length)
For low level operation:
[actuation level] = [switch release position] + 20 mm (screw length)
For example, consider a type NLS-1A needing 200 mm actuation levels
(low and high):

The pipe must be 300 mm for high level operations.
200 mm + 80 mm + 20 mm = 300 mm
The pipe must be 280 mm for low level operation.
200 mm + 60 mm + 20 mm = 280 mm

• Select the proper material which is compatible with the liquid.

• Install the detecting pipe into the R 1/2 in. coupling of the NLS. This is
coupling must be airtight to insure reliable operation. Use a paste form
sealing compound on the coupling.

• Make sure the diaphragm is mounted in horizontal alignment.

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Rev . A1, 4/07 NLS Series

• Wiring

Wiring should be in accordance

with all local codes. The control

2

cable should be 0.75 mm
minimum. The terminal screw is
M3.0. The cable gland is JIS F 20a.

Switch rating (resistive)
250 V 10 A AC

• Adjustment Procedure

The microswitch position should be adjusted if the switch operating

position is changed or the microswitch does not release.

• If the switch operating position is higher than the desired level, lower the
microswitch a little.

• If the switch operating position is lower than the desired level, raise the
microswitch a little.

The NLS is designed to use a connecting pipe.
Switch operating position and release position in water (SG = 1.0) with 1/2

in., 300 mm length pipe are shown below.

Model NLS-1A NLS-1S NLS-3

Switch operating 80±10 70±10 65±10
position (mm)

Switch release 60±15 50±15 50±15
position (mm)

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NLS Series Rev . A1, 4/07

• Maintenance

As a rule, there is no need to inspect periodically. However, pay attention to

the following points.

• In case of low level detection, if the detecting pipe soaks long in
liquid, pressurized air in the detecting pipe is dissolved into liquid.
Consequently, actuating level may raise. To prevent it, the NLS must be
pulled out and purged at adequate intervals.

• Replace the diaphragm about once every three year period. Except
damaged by corrosive vapor, the diaphragm degradation cannot be
checked vertically.

• Check the microswitch operation. Life of the microswitch is 50,000
actuations or more.

• Check that the silicon sealant is applied onto the connecting part
between the NLS and the detecting pipe. If the seal tape is used,
compressed air will leak and switch will not operate properly.

Automation Products Group, Inc.

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Rev . A1, 4/07 NLS Series

• Life Expectancy

Life expectancy of the NLS varies with applications such as corrosive vapor,

temperature, microswitch’s load, etc.

Since the NLS is not in contact with the liquid, it can be used for a long time.

Replace expendable diaphragms and microswitches.

• Spare Parts

Model Description Part Number
NLS-ACC1 Neoprene diaphragm for NLS-1A 22907-0022
NLS-ACC2 Viton diaphragm for NLS-1S 22907-0023
NLS-ACC3 Neoprene diaphragm for NLS-3 22907-0024
NLS-ACC4 Microswitch assy for NLS-1A 22907-0085
NLS-ACC5 Microswitch assy for NLS-1S 22907-0086
NLS-ACC6 Microswitch assy for NLS-3 22907-0087

Automation Products Group, Inc.

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9

AUT OMATION

PRODUCTS

GROUP, INC.

APG...Providing tailored solutions
for measurement applications

Automation Products Group, Inc.

Tel: [phone]
1/435/753-7300
Fax: [phone]

e-mail: [e-mail]

www.apgsensors.com

Automation Products Group, Inc.

1025 W. 1700 N.

Logan, UT 84321