Gems Sensors & Controls ELS-1100FLG, ELS-1100 Operating Manual

Instruction Bulletin No. 138184 (Rev R)

ELS-1100 Series

Electro-Optic Level Switch

Specifications

Materials
Housing and Prism
Operating Pressure
Operating Temperature
Current Consumption
Input Voltage
Output

Repeatability

EMI Susceptability

Approvals

Note: Not for use in freezing liquids

Polysulfone or Nylon
0 to 150 psig, Max.
0°F to 176°F (-17.8°C to +80°C)
18 mA, Approximately

See Part Number Chart

TTL/CMOS Compatible, Open Collector
Output may Sink 40 mA up to 30 VDC
±1 mm

Meets Specification (MIL-STD-461B
Part 2 Modified) of 10 V/M for

Frequency Range 30 to 1000 MHz
(Except 609 MHz = 9 V/M

and 679 MHz = 7.5 V/M)
C.E. EN 61326

Units Labeled UL. File E 108913

Input

Power

5 VDC

10-28 VDC

Installation

1. For NPT threaded units:

Use Teflon (TFE) thread tape or Permatex #80725 plastic pipe

a.

sealant to seal thread. Caution: Pipe sealant must not come in

contact with prism surface.

b. Thread sensor into tank wall and tighten by hand. Further tighten

an additional one to two threads past hand-tightness.

overtightening, as this may damage threads.)

2. For 1/2" and M12 straight threaded units:
a. Thread sensor into tank wall by hand until sensor housing contacts tank wall surface. ( See below for mating o-ring

gland design information.)

b. The sensor shall be torque tightened to 12 to 24 in-lb ( 1.4 to 2.7 N-m). This range is slightly more than “hand-tight” to

insure sealing, and less than that which would cause housing or thread damage.

c. CAUTION: Under no circumstances shall the sensor be tightened more than 1/6 turn beyond that required to seat the

bottom of the sensor housing with the outside wall of the tank.

3. Sensor may be installed in horizontal or vertical position only.

4. Caution: Do not install sensor close to infrared sources or incandescent light. (Note: Any optical sensor may be affected

by reflective surfaces. Consult Gems if prism is to be less than 2 inches from any reflective surface.)

The test depicted below was performed to determine the sensor immunity level to ambient light. The recorded ambient is
the maximum level at which the sensor performs/detects normally.

Test

Sensors

Light Meter

a

GE Model #214

Variac

(Avoid

Sensor T ype

ELS-1100 Polysulfone
ELS-1100 TFE
ELS-1100HT Isoplast

ELS-1200 RE

ELS-1200

ELS-1200CR
ELS-1100 Nylon

Black Container

Part

Number

138167
144225
144235
166541
175631
187575
187590
142700
143570
143575
143577
143580
143585
143590
148973
157750
169555
169556
175632
187580
187585

300 Ft-Cd
100 Ft-Cd 25 Ft-Cd
500 Ft-Cd

250 Ft-Cd
>1000 Ft-Cd
400 Ft-Cd
65 Ft-Cd

Probe Condition

At Current Sink

Wet
Wet
Wet
Wet
Wet
Wet

Dry

Wet

Dry

Dry
Wet
Wet
Wet

Dry

Dry
Wet
Wet

Dry

Dry

Dry
Wet

Opaque Container

45 Ft-Cd

250 Ft-Cd
25 Ft-Cd

700 Ft-Cd
25 Ft-Cd
25 Ft-Cd

Test Container(s)

Note: 1 Ft-Cd = 10.7 Lux
Above testing is based on minimum readings of at

least two (2) samples.

Installation (Contd.)

5. Connect VDC (±10%) power to red lead; return (-) to
black lead. Caution: Do not connect output to VDC

power without a load.

Output Configuration: See Wiring Diagrams.

6.

Maintenance

Sensor may require a periodic cleaning of prism surface.

Chlorinated hydrocarbons must not be used for cleaning.

A mild detergent may be used to clean prism surface.

Return Policy

Returns are accepted on stock items up to 30 days from date of
order. You must contact our Returns Department for a Return
Authorization (RA) number. Return the goods - freight prepaid - in
the original container and include original packing slip.
C. O. D. returns are not accepted. Gems reserves the right to
apply restocking charges.

Tel: [phone]
Fax: [phone]

Mating O-Ring Gland Design

1/2" Straight Thread

SAE #5 TUBE FITTING

12°

.555

(AT TOP)

∅

.550

Input Power

+ VDC

Red

Load

**

White
Black

Input
Power
+ VDC

Red

White
Black

*

+ VDC

M12 X 1 Straight Thread

.108
.093

Typical Wiring Diagrams

Load

Input

+ VDC

Power
+ VDC

**

L
O

Red

Switch

Switch

45°

∅ .570 ± .002
[14.5 ± .05 mm]

A
D

White
Black

Notes

* TTL/CMOS Output: For levels greater

than 5 volts, a 10K pull-up resistor is
required at the output.

** Maximum Load = 40mA @30 VDC

Switch

.020
[.50 mm]

.150
[3.80 mm]

1/2-20 UNF 2B

Dimensions

1/4” NPT Mounting

1/4”
NPT

5/8” HEX

(15.9 mm)

2-5/32”

(54.7 mm)

Lead

Wires

Epoxy

Encapsulated

1/4”
NPT

Electrical Termination: Lead Wires, 22 AWG, PVC Jacketed, 12” to 14” Extended

M12x1 Straight Thread

Mounting with O-Ring

M12 x 1

→

.47”
Ref.

←

Viton

O-Ring

5/8” HEX

(15.9 mm)

→

←

2-5/32”

(54.7 mm)

Electrical Termination: Lead Wires, 22 AWG, PVC Jacketed, 12” to 14” Extended

• Gems products must be maintained and installed in strict accordance with the National Electrical
Code and the applicable Gems Product Instruction Bulletin that covers installation, operation and
proper maintenance. Failure to observe this information may result in serious injury or damages.

• For hazardous area applications involving such things as, but not limited to, ignitable mixtures,
combustible dust and flammable materials, use an appropriate explosion proof enclosure or
intrinsically safe interface device.

• Please adhere to the pressure and temperature limitations shown throughout this catalog for our
level and flow sensors. These limitations must not be exceeded. These pressures and temperatures
take into consideration possible system surge pressures, temperatures and their frequencies.

• Selection of materials for compatibility with the media is critical to the life and operation of Gems
products. T ake care in the proper selection of materials of construction, testing is required.

• Stainless steel is generally regarded as safe by NSF and FDA.

1/4” NPT Mounting

with 3/8” Conduit

5/8” HEX

(15.9 mm)

2-5/32”

(54.7 mm)

Flange Mounting

Threaded Holes Not Required

1/4” Max. Wall Thickness

2.16” Ref.

1/8” Thick
Viton Gasket

Important Points:

Gems Sensors Inc.

One Cowles Road
Plainville, CT 06062-1 198
Toll-Free: 1-800-378-1600

M12 X 1 - 8G

1/2” Straight Thread

Mounting with O-Ring

3/8” NPT

Mounting

1/2” - 20

UNF

.47”
Ref.

2-5/8” Ref.

(66.7 mm)

11/16”-16 Thd. REF

Removable PVC
Fish Pull Ring

25’ Cable, 22 AWG, PVC Jacketed

• NSF-approved sensors are made of materials approved for potable water applications according
to Standard 61.

• Life expectancy of switch contacts varies with application. Contact Gems if life cycle testing is
required.

• Ambient temperature changes do affect switch set points, since the gravity of a liquid can vary with
temperature.

• Our sensors have been designed to resist shock and vibration. However, shock and vibration should
be minimized.

• Filter liquid media containing particulate and/or debris to ensure the proper operation of our products.

• Electrical entries and mounting points in an enclosed tank may require liquid/vaporsealing.

• Our sensors must not be field-repaired.

Viton

O-Ring

2-5/32”

(54.7 mm)

“Fish” Pull Ring

5/8” HEX

(15.9 mm)

Cable

5/8” HEX

(15.9 mm)