ULS-1 Single Point Level Switches
IP65 ingress protection
Stocked items highlighted.
Compact 1/4˝ and 1/2˝ NPT versions
All-Stainless Steel wetted materials
IP68 construction for tanks or sumps
Gems ultrasonic switches are an excellent choice for a broad range of liquids
including those with light coating or scaling type characteristics.
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Relay output provides a reliable switch interface with remote devices such as a PLC,
SCADA or alarm.
Specifications
Wetted Material 316L Stainless Steel
Repeatability 2 mm (or better)
Protection Transient Reverse Polarity
Leakage Current <50μA
Delay 0.5 seconds
Input Power 5 VDC to 30 VDC
Output See Ordering Table
Dimensions
1/4˝ NPT Mounting
1/2˝ NPT Mounting
HIGH LEVEL
1/4˝ NPT
1˝
(25.4)
3/8˝
(9.5)
5/8˝
(15.88)
1.76˝
(44.7)
SWITCH POINT
1/2˝ NPT
(15.9)
5/8˝
1˝
(25.4)
How To Order
Select a Part Number based on Mounting Size and Output.
Mounting Size Electronic Output Part Number
Wet Sink 220901
1/4˝ NPT
1A SPST Relay, Normally Closed 220903
1/2˝ NPT
1A SPST Relay, Normally Closed 221487
Note: Other Electronic Output options are available. Please contact Gems.
Wet Source 220902
Wet Sink 221485
Wet Source 221486
- Standard units suitable for use up
to 80°C.
- High temperature versions also
available - up to 100°C.
5/8˝
(15.88)
2 1/4˝
(57.15)
SWITCH POINT
LOW LEVEL
Wiring
POWER
WHITE
OUTPUT
BROWN
(+) RED, 5VDC TO 30VDC
(-) BLK, GROUND
GREEN, CHASSIS GND
24 AWG PVC JACKET,
12˝ (305 MM) LENGTH
Wiring Direct to a Load
N.C. Operation (Relay Signal Output)
RED
BLACK
BROWN
WHITE
GREEN
SHIELD
GROUND
LOAD
CONTROLLED DEVICE
(RELAY, LAMP, VALVE, ETC.)
1A MAXIMUM
12 - 36 VDC
POWER SUPPLY
(SENSOR)
60 VAC/ VDC
MAXIMUM
POWER SUPPLY
6"(+
Visit www.GemsSensors.com for most current information.
Ultrasonic Switches Monitor the Toughest Applications
Operates in a wide variety of liquids
Handles pressures to 1000 psi
Unaffected by foam, vapors, particulate or turbulence
Lengths to 121 inches (307.3 cm)
Can be side, top or bottom mounted
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Sized and priced for most applications
Easy to install — simple to use
GEMS ULS Series of ultrasonic switches are designed for a broad
spectrum of viscous to light liquids; including some of the most
challenging liquids you may deal with: acids, freon, paints, lacquers,
etc. Stainless steel units are built to withstand high temperatures and
pressures with welded stainless steel sensor probes that have no
seals to leak and no moving parts to wear out. ULS Series switches
are unaffected by variation in temperature, pressure, density or type of
liquid. ULS-10 and ULS-100 electronics are housed in cast aluminum,
NEMA 4/NEMA 7 explosion proof and water tight enclosures.
Ultrasonic Switch
ULS-100
ULS-10
Selection Guide
Single Point Sensing
Input Power:
115 VAC / 230 VAC
12/24 VDC
9-36 VDC
12-36 VDC
Output:
10 Amp DPDT
1 Amp SPDT
5 mA (dry), 10 mA (wet)
4 mA / 20 mA Single 2-Wire
FM-Approved Explosion Proof Option
Sensor Material Options:
316 Stainless Steel (standard)
316L Stainless Steel
®
Monel
Hastelloy B
Hastelloy C
Teflon
Kynar
CPVC
Polypropylene
®
®
®
®
ULS-1
ULS-10
ss
s
s
s
s
s
s
s
s
s
s
ULS-100 ULS-11
ss
s
s
s
s
s
s
ss
s
s
s
s
s
s
s
ULS-1
ULS-11
6"()
Visit www.GemsSensors.com for most current information.
General Operating Principle
ULS Series switches operate using ultrasonic
sound wave propagation. Ultrasonic sound
waves are greatly attenuated when transmitted
through air. Conversely, when liquid is
present, transmission of the sound waves is
greatly enhanced. The electronic control unit
generates electrical signals that are converted
to bursts of ultrasonic energy at the sensor.
The ultrasonic bursts are transmitted across
the liquid sensing gap. Upon receipt of a valid
signal, the solid-state electronics generate
a data enable condition, indicating liquid is
present. This signal energizes a relay and
provides an output condition.
TRANSMITTING
CRYSTAL
RECEIVING
CRYSTAL
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Switch actuates when level
reaches halfway point of gap.
Typical Installation
1. Drill a suitable hole in the vessel or pipe wall
and tap for 3/4˝ NPT. In thin walled vessel
or material not suitable for threading, weld
or braze a bushing to accept the sensor.
2. Screw the sensor in the threaded section
and make sure that there is a good seal. Use
a pipe compound or sealing tape to avoid
excessive tightening. Do not overtighten.
3. Run the power and control wiring cables to
the electronics control unit.
Vertical or Horizontal Mounting
HIGH LEVEL ALARM
PUMP CONTROL
LOW LEVEL ALARM
Advantages of GEMS ULS-10 2-Wire Output Switches
1. No A.C. Power
2. No Coaxial Cable Required
3. Up to 1000 ft. or Longer Distance
4. Reduces Installation Cost
Secondary Containment Tanks and Piping Systems
Maintenance
Electronics are
constructed with solidstate components
and epoxy-potted.
Periodically, check
and clean the sensor
when used with liquids
which cause a coating
build-up on the sensor. No
other maintenance is required.
If the pipe or vessel to which
the unit is mounted is to be
steam-cleaned or cleaned with
abrasive detergents, remove
the entire unit before cleaning
by:
(1) Disconnecting the power
at source.
(2) Opening the housing cover.
(3) Removing power and control wiring cables.
(4) Unthreading the sensor.
To reinstall, follow installation procedures.
CARRIER
PIPE
SECONDARY
CONTAINMENT
PIPE
SECONDARY CONTAINMENT
(1/2" NPT OPTIONAL)
SECONDARY CONTAINMENT TANK
3/4" NPT FITTING
3/4" NPT
FITTING
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COMPUTER INTERFACE
OR
REMOTE CURRENT
DETECTOR CIRCUIT
Contents Page Start
ULS-1 Low Power Steel
ULS-10 & ULS-100 10 Amp Switches
ULS-11 Low Power Steel
Visit www.GemsSensors.com for most current information.
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A-34
A-35
A-37
6"(*
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