Gems Sensors ELS-950 Series Instruction Bulletin

Specifications
Materials
Housing and Prism
Operating Pressure
Operating Temperature
Input Voltage
Output Configuration
Current Consumption
(No Load)
Repeatability
Ambient Light Immunity
Approval
Specifications
Note: Not for use in freezing liquids
Installation
1. For NPT threaded units:
a. Use Teflon (TFE) thread tape or Permatex #80725 plastic pipe 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. (Avoid
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 up to 45° from horizontal plane for best operation. Vertical mounting is possible, may be droplet sensitive,
depending on viscosity of media.
4. Caution: Do not install sensor close to infrared sources or incandescent light. Reflective surfaces may interfere with proper operation of the optical
sensor. (Consult Gems Sensors if prism is to be mounted less than 2" from any reflective surface.)
5. Connect voltage supply (Vdc + 10%) Between red (+) and black (-) of the unit.
Caution: Do not connect output (blue wire) to Vdc power without a load.
See wiring diagrams for output configuration.
Special caution should be taken to meet EN61000-4-5 Surge Immunity if any of the following conditions apply to the installation: The product
is installed outside; the cable is greater than 30 meters in length. In order to meet the Surge Immunity requirements, the following conditions
must be followed during installation:
1. Shielded cable must be used, and the shield must be tied to earth ground (not power supply ground) on at least one end of the cable
shield/drain wire. The shield must be maintained all the way from sensor to the power supply.
2. If unshielded cable is used, an earth grounded metal conduit can be used to replace the shielded cable.
3. For the sensor with metal body or enclosure the body/enclosure must be grounded to earth. If a protective metal housing is used, the
metal housing should be grounded to earth.
4. If a protective plastic housing is used, the housing must be able to withstand at least 2 kV from the housing to earth ground.
Test
Sensors
Test Container(s)
Electro-Optic Level Switch
Polysulfone
0 to 250 psig, (0 to 17 bar) Max.
-40°F to 230°F (-40°C to +110°C)
See Part Number Chart
Open drain may sink 40mA max.
~ 4mA @ 5Vdc
~ 10mA @ 12 Vdc
±1 mm
See Ambient Light Test
U.L. Pending
Light Meter
GE Model #214
Ú
ELS-950 Series
n I p t u A c u t t a o i
P o w r e C o n d t i o i
W t e
5 V D C
± 1 0 %
D y r
1 2 W t e
V D C
± 1 0 %
D y r
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.
Variac
Black Container
390 FT-CD
Note: 1 Ft-Cd = 10.7 Lux
Above testing is based on minimum readings of
at least two (2) samples.
Instruction Bulletin No. 225480
M o u t n n i g T y
n
n
1 4 / " N P T 1 2 / " 2 - 0 U N
2 2 4 5 0 4 2 2 4 5 0 1
2 2 4 5 0 5 2 2 4 5 0 2
2 2 4 5 0 6 2 2 4 5 0 3
2 2 4 5 0 7 2 2 3 6 2 5
Max Ambient Light
Opaque Container
30 FT-CD
p e
F 2 - B M 1 2 x 1 8 -
2 2 4 5 0 8
2 2 4 5 0 9
2 2 4 5 1 0
2 2 4 5 1 1