Unique Designs…For use in Liquids or Gases
Gems™ line of flow switches feature a broad range of configurations for use in liquids or gases. At preset rates, ranging from 50 cc/min to 100 GPM, Gems switches will initiate alarm actuation or automatic shut-down of a system.

These switches feature high quality, corrosion-resistant materials for use in the toughest environments. Material choices, ranging from stainless steel to Ryton offer vast chemical compatibility. Versions include switches with fixed or adjustable actuation settings, models for viscosity compensation or high pressures, in-line models and designs to satisfy any mounting or space requirement.

Variety of Operating Principles
The versatile Gems flow switch line utilizes four basic operating principles. Piston types are designed for low flow rates in gases and liquids from 50 cc/min to 20 GPM. Shuttle models are for use with high flow rates from .5 GPM to 100.0 GPM. Paddle models are for large line sizes from 1.25″ (32 mm) and up. Electronic switches encompass state-of-the-art electronics and positive visual indication.

RotorFlow Sensors

RotorFlow^® Sensors Provide Visual Indication, Continuous Sensing and Accurate Switching

• Bright, Visual indication with choice of pulsed DC output, or adjustable 1 amp switched output.
• Flow ranges from .1 GPM to 60.0 GPM
• Compact inline housings
• Available in high performance plastic, brass, or stainless steel housings.

Determined to provide you with the most versatile line of flow sensors available, we’ve continued a non-stop refinement process for the entire RotorFlow^® Series.  Gems™ new generation of RotorFlow^® sensors, the RF-2500 Series flow switch, has been totally re-engineered with a one piece composite rotor, stronger unibody construction, ceramic shaft and better sealing.  The results are greater durability with broader chemical, temperature and pressure capabilities.

Today’s RotorFlow^® Series is state-of-the art and offers more options, better performance and durability than ever before…all at an affordable price geared for high volume, OEM applications.

Select the RotorFlow^® sensor that is right for your application by choosing one of our three distinct configurations.  You’ll find details on each of these configurations inside.

Switch Types
For specific flow setpoint switching, RotorFlow^® RFS type flow stitches are one of the most reliable flow switches available.  Setpoints are fully adjustable over the specified flow range.  The dynamic operation of the rotor guards against jamming and false actuation.

Output Types
For flow rate monitoring or metering applications.  RotorFlow^® RFO type flow sensors provide a pulsed DC voltage output that is proportional to the rate of flow.  The operating range of 4.5 to 24 VDC pulsed output is easily integrated into most digital logic units.  RFA Type RotorFlow^® sensors provide a continuous 0-10 VDC analog output.

Indicator Types
For those who want simple visual confirmation of flow, RotorFlow^® RFI flow indicators provide the durable, low-cost answer.  A bright, orange spinning rotor provides visual flow confirmation at a glance.

Float Level Switches & Sensors with Magnetic Reed Switches

Gems™ Liquid Level Float Switches operate on a direct, simple principle. In most models, a float encircling a stationary stem is equipped with powerful, permanent magnets. As the float rises or lowers with liquid level, the magnetic field generated from within the float actuates a hermetically sealed, magnetic reed switch mounted within the stem. The stem is made of non-magnetic metals or rugged, engineered plastics. When mounted vertically, this basic design provides a consistent accuracy of ±1/8 inch. Multi-station float switches use a separate reed switch for each level point being monitored.

Side-mounted float switches use different actuation methods because of their horizontal attitude. The basic principle, however, is the same: as a direct result of rising or falling liquid, a magnetic field is moved into the proximity of a reed switch, causing its actuation.

Magnetic Reed Switch Reliability
The durable construction of these magnetic reed switches ensures long, trouble-free service. When the effects of shock, wear and vibration are minimized, these hermetically reed sealed switches provide precise repeatability with no more than 1% deviation. The sensor actuation points remain constant over the life of the float switch.

Customers typically choose float switches and magnetic reed switches because they are hyper-reliable, simple and are an economical way of determining liquid level. These sensors can be made of a variety of material options and are compatible with most liquid media. These sensors are intended to actuate when media is at a single set high or low point.

Multi-Point Level Sensors

Gems custom length multi point level switches are an extremely versatile cost effective way to monitor multiple liquid level points within a single tank. These multi point units can be configured with two to seven independent switch actuation levels, depending on the series type. Only a single entry point into the tank is required, and all electrical wiring emanates from a single source. In addition to tracking changing level points of a single liquid within a tank, multi point level switches are ideal for monitoring liquid interfaces and emulsions in vessels simultaneously containing two or more liquids. Gems multi point level switches are available in engineered plastic or metal alloy with a broad range of mounting options and float materials. Gems multi point level sensors are offered with integrated siphon tubes and temperature sensors to provide cost savings and limit the number of intrusions into a tank.

For challenging fluid measurement Gems new ultrasonic UCL-510 Transmitter/Multi point Level Sensor Combo is the answer. This accurate and reliable sensor offers a non-contact alternative to our float of conductance sensors in small tank chemical feed or handling applications when corrosive, sticky or dirty media are present. The UCL-510 features programmable level intelligence and can be reconfigured for different sensing duties.

Float Level Switches

Gems™ custom length float level switches are extremely versatile. Custom length levels can be configured with “up to seven” independent switch actuation levels, depending on the series type. These “multi-station” units offer the most practical way to monitor multiple liquid level points within a single tank. Only a single entry point into the tank is required, and all electrical wiring emanates from a single source. In addition to tracking changing level points of a single liquid within a tank, “multi-station” float level switches are ideal for monitoring liquid interfaces and emulsions in vessels simultaneously containing two or more liquids. Contact Gems with your liquid specifications for further information on this type of application.

The durable construction of these reed switch designs ensures long, trouble-free service. Because the effects of shock, wear and vibration are minimized, these hermetically sealed switches provide precise repeatability with no more than 1% deviation. The switch actuation points remain constant over the life of the unit.

Level Transmitters

Gems float type liquid level transmitters provide reliable and durable remote tank gauging. A wide variety of material combinations make them compatible with most liquid media. The XM & XT-800 Series provide solutions for most small to mid-size tanks, for deeper tanks look to the 36000 and 66000.

For challenging fluids such as ultra-pure, dirty, coating, scaling and corrosive types, Gems offers the UCL-510 and UCL-520 ultrasonic liquid level transmitters. Our UCL series are easy to install and do not come in contact with the liquid. The UCL-520 is push button the calibrated, the UCL-510 is supplied with configuration software for flexible system integration or retrofit of existing level devices.

For applications requiring an extremely high level of accuracy Gems new CT-1000 potentiometric level transmitter offers no-moving parts sensing of conductive liquids. The XT-1000 magnetostrictive liquid level transmitter provides temperature compensated measurement on a variety of liquid media.

Continuous Float Level Transmitters

Completely electronic, Gems™ Liquid Level Transmitters provide reliable and durable remote tank gauging. A wide variety of material combinations provide compatibility for most liquid media. Gems XM- & XT-800 Series provide solutions for most small to mid-size tanks in both process and OEM applications; for deeper tanks (to 18 feet) look to the Gems 36000 and 66000 Series.

Gems experienced engineering and sales staff can provide customized solutions for applications not satisfied by the standard transmitters shown in this catalog. Do not hesitate to contact Gems if you require a configuration not shown here.

If you are looking for a float for tight spaces, our new XM/XT Series Single Float Transmitters, designed for continuous fluid monitoring, are for you. Engineered to provide high-accuracy, Gems new XM/XT, offer a cost effective solution for compact tank environments.

Single Probe or Complete Systems
As a component, Gems level transmitters provide the output options compatible with most programmable controllers and other digital receivers. Combined with Gems Digital Receivers you can create a complete tank gauging system.

Typical Applications

• Utilities
• Beverage Industry
• Medical
• Pharmaceutical
• OHV
• Food Processing
• Wineries
• Printing
• HVAC
• Semiconductor

1200/1600 Series Pressure Transducers

• Voltage and Current Output
• Gauge, Vacuum, and Compound Pressure
• General Purpose and Wash Down Enclosures

OEM Pressure Transducers Featuring Exceptional Proof Pressure and Stability Specifications

The 1200 series pressure sensor features stability and toughness via its CVD and ASIC design coupled with a thicker diaphragm. The thicker diaphragm enables these pressure transducer sensors to survive most pressure spikes caused by pump ripple, solenoid valves, etc. The 1600 series extends the packaging options by providing an all welded stainless steel back end for demanding industrial applications. A modular design allows special ordering of fittings, electrical cables, etc. for OEM applications. The ASIC and CVD technology enables Gems™ to offer almost any output over any pressure range.

Applications:

• Off-Highway Vehicles
• Natural Gas Equipment
• Semiconductor Processing
• Power Plants
• Refrigeration
• Robotics
• HVAC

Visual Level Indicators & Tank Level Gauges

For easy to view liquid level indication that is both accurate and nearly indestructible, nothing beats SureSite liquid level indicators. They are used in applications within every market segment where quick visual communication of tank contents is paramount. SureSite indicators operate without power, in temperatures to 750°F (399°C) and in pressures to 4200 psi (290 bar); they are unaffected by extreme thermal changes.

SureSites are a durable and safer alternative to breakable sight glasses. Featuring stainless steel, alloy or engineered plastic housings SiteSites mount externally to the top or sides of tanks to provide easy-to-read, continuous level gauging. The magnetic level indicator is isolated from the measured media in a pressure-tight housing allowing SureSite indicators to be used in areas where sight glasses are not even a consideration. SureSite indicators are unaffected by tank shape, condensation, atmospheres, foam, stratification of vapors, high temperatures or flux and don’t require continual calibration. Modular accessories such as switches, scales and continuous transmitters increase control capabilities.

DIPTAPE tank level indicators & tank level gauges are manually operated, compact and self-contained. Ideal for hazardous areas, they are non-electrical, plus liquids and vapors remain sealed from the atmosphere. Pop the cap, pull the tab and up comes the tape to tell you exactly how much liquid remains in the tank or drum. DIPTAPE indicators are designed for tanks up-to 6′ (1.8 m) and are available in alloy, all PVC and engineered plastic versions.

Suresite Visual Liquid Level Indicators

A visible level gauge that is a safe alternative to cloudy, breakable sight glasses.

High Visibility – Brilliantly colored flags are easy to read, even at great distances. The water level indicator is isolated from the measure media; therefore, Suresite® water level gauges can be used where sight glasses are not even a consideration.

Durability – Stainless steel, PVC, CPVC, PVDF, Hastelloy or other exotic housings, whatever the media requirements, provide years of maintenance-free service.

Environmentally Safe – Monitored liquid is contained inside a pressure-tight housing.

Efficient – Continuous level indication without external power.

Electronic Control – Attach optional level switches and/or continuous level transmitters to extend capabilities beyond those of a simple sight glass.

Great for different liquids – Suresite is a great level gauge for these applications: oil level gauge, oil level indicator, water level indicator, water level gauge and more!

If you don’t see materials or configurations on this site to suite your needs, please give Gems™ a call for custom application assistance.

Warrick^® Conductivity level control systems rely on the liquid level sensing capability of probes (electrodes) that are housed inside fittings designed to accommodate one or more probes. The concept is simple: take advantage of a liquid’s conductive properties to complete a circuit and cause a control relay to actuate. These single- or multi-point sensors have no moving parts and the stainless steel corrosion-resistant electrodes can be cut to the desired length. Multiple probes per fitting allow control of several functions in less space with less expense for equipment and installation. To create a system select from numerous level controls, fittings and probe options. For OEM’s we also have the capability to custom configure liquid level control sensors and electrode fittings to meet your specific conductivity level control application requirements.

Warrick® Liquid Level Controllers

For over 50 years Warrick^® Controls have offered dependable no-moving-parts control and monitoring of conductive liquids. Now as part of the Gems™ Sensors family, Warrick^® conductivity controls continue to offer reliability, process automation, labor savings, flexibility and operator safety at economical cost. The concept is simple: take advantage of a liquid’s conductive properties to complete a circuit and cause a control relay to actuate. Use of permanently-mounted stationary electrodes gives the user precise accuracy, repeatability and no-moving-parts reliability. This simple concept has led to the development of a complete line of conductivity-based liquid level detectors, water level detectors, and control units and electrode fittings shown here. For OEM’s we also have the capability to custom configure liquid level control units and electrode fittings to meet your specific application requirements.

System Components

1. The liquid level control unit is an electrical device with contacts that open and close in response to liquid levels sensed by the probes. Because it is wired directly to the power source and to the sensing source, it can send signals that activate or de-activate solenoids, pumps, alarms or pressure switch devices. Warrick^®controls are available in many different designs and sensitivity ratings for a wide range of application requirements.
2. The fitting is a housing that holds the probes (or floats), insulates them from the vessel, and provides a means of connection to the control. Warrick^® fittings are available for single-probe or multi-probe applications, for mounting to vessels in a variety of ways, and in open or pressure tight styles.
3. The probe is a sensor that extends downward from the fitting, with the tip positioned precisely at the level where the control should be activated. Warrick^® probes are available in a variety of materials to suit different liquids and a variety of lengths to fit different depth requirements.

The liquid level control system shown here is designed for “pump up” application. The pump will start refilling the vessel when the liquid reaches the lower probe tip, then stop refilling the vessel when the liquid reaches the higher probe tip.

A Series Solenoid Valve

• MOPD: 1000 psi (69 bar)
• C_V Range: 0.019 to 0.3
• 6 Watts

The A Series solenoid valve gives you a highly adaptable design for practically all applications requiring flow between CV 0.019 and 0.300.  This robust 2- or 3-way miniature solenoid utilizes a stainless steel body to resist corrosion for most acids, alkaline solutions, and harsh environments.  Also available in plastic — from polypropylene to Delrin^®— when specific inert or demanding requirements are needed.  Available in numerous port configurations, orifice sizes, and material combinations, the A series is a highly flexible valve that fulfills the requirements for most applications.

Applications:

Stainless Steel Body

• Medical Equipment
• Laboratory Equipment
• Food Processing Equipment

Brass Body

• Industrial Applications
• Automotive
• Water Transfer Systems

B-Cryo Series Solenoid Valve

• MOPD: 900 psi (62 bar)
• C_V Range: 0.045 to 0.440
• 9 Watts

The B-Cryo Series is a 2-way miniature Cryogenic solenoid valve designed and built for service down to   -320°F (-196°C) in applications needing a C_V between 0.045 and 0.440.  Depending on your temperature requirements, the B-Cryo Series can be configured for liquid nitrogen (LN2), liquid carbon dioxide (LCO2), and other extreme temperature media.  PTFE coated plungers, 316 stainless steel guide tubes and plunger springs, encapsulated coils and PTFE or Rulon^®seat seals produce a truly robust cryogenic valve for applications requiring high cycle life and media temperature control.

Applications:

• Environmental Chambers
• Food Processing
• Laser Surgical Equipment
• Semiconductor Manufacturing

AS Series Solenoid Valve

• MOPD: 150 psi (10 bar)
• C_V Range: 0.020 to 0.300
• 7 Watts

The AS Series is a 2-way isolation solenoid valve, designed to control the flow of various aggressive liquids and gases with several body and diaphragm materials.  With a modular design, the AS offers performance, flexibility, and the protection your media needs from the solenoid’s internal components.  Numerous port configurations, voltage options, and coil constructions enable the AS Series to be a truly versatile miniature inert isolation valve, easily integrated into any complex or demanding system.

Applications:

• Analytical Instruments
• Clinical Diagnostic Analyzers
• Bio-Instrumentation

Gems™ Pressure Switches Cover A Wide Range of Applications From 2 to 6000 psi (40 mbar to 400 bar)

Gems offers a choice of pressure switches, water pressure switches from compact cylindrical models for OEM use, to larger, enclosed units for rugged process applications. These water pressure switches are ideal for the filtering process of coolants in the machine tool industry, use in transmissions of off-highway vehicles and as redundant systems with existing monitors such as transducers.

Unique Piston/Diaphragm Design

A piston/diaphragm design, incorporating the high proof pressure of piston technology allows these pressure switches to operate with the sensitivity and accuracy of a diaphragm design. Repeatability ranges from 0.25 percent to 5 percent of the set point.

Many Materials To Choose From

Enclosures include aluminum, stainless steel, brass, reinforced plastic and zinc-plated steel. Wetted parts include a diaphragm available in Buna-n, Teflon^® coated Kapton^®, stainless steel, PTFE, EPDM or Viton^® and a pressure port available in stainless steel, brass, zinc or aluminum.

Gems™ Pressure Transducers Deliver Top Performance and Value Under Pressure!

When your applications require exceptional pressure sensing performance and long-life reliability, look to Gems to deliver. From vacuum to 10,000 psig (-1 to 689 bar), we’ve got you covered with the industry’s largest selection and best choice of pressure transducer technologies. Our capacitance type sensors are ideal for high volume use; sputtered thin film types are the most precise pressure sensors you can buy, and our other types satisfy all requirements in between.

Typical Pressure Transducer Applications

• Off-Highway Vehicles — Load Weighing Systems and Load Moment Indicating
• Natural Gas Equipment — Compressors and Dispensing Equipment
• Semiconductor Processing — Wafer Manufacturing
• Power Plants — Piping Steam Pressure
• Refrigeration — Compressors and Lube Oil Pressure Sensor & Equipment
• Robotics — Factory Automated Equipment
• Test & Measurement — Dynamometers, Medical Instrumentation, Wind Tunnels
• Barometrics — Altimeter certification, Weather Stations
• HVAC — Compressors, Filter Monitoring, Energy Management
• Transportation — Breaking, Compressors, Lifts, Air Conditioning

Psibar^® CVD Type Pressure Sensors

Chemical Vapor Deposition manufacturing methods bond a polysilicon layer to a stainless steel diaphragm at the molecular level to produce a sensor with superior long term drift performance. Common batch processing semiconductor manufacturing methods are used to create a polysilicon strain gauge bridge with terrific performance at a very reasonable price. CVD construction offers excellent price/performance and is the most popular sensor for OEM applications.

Sputtered Thin Film Type Pressure Sensors

Sputtered film deposition creates transducers with maximum combined linearity, hysteresis and repeatability. Accuracy is as high as 0.08% full scale with long term drift as low as 0.06% full scale per year. Phenomenal performance for critical instruments — Gems sputtered thin film transducers are the jewels of the pressure sensing industry.

Capacitance Type Pressure Sensors

Gems manufactures capacitance type pressure sensors for a wide range of high volume OEM specialty applications. Detecting the capacitance change between two surfaces allows Gems transducers to sense extremely low pressure and vacuum levels. Robust construction allows these units to be used in a wide variety of applications. Coupled with an ASIC, these units provide good price/performance in a host of packaging styles.

MMS Type Pressure Sensors

These transducers employ a micomachined silicon (MMS) diaphragm to detect pressure changes. The silicon diaphragm is protected from the media by an oil-filled 316SS isolation diaphragm; they react in tandem to process fluid pressure. MMS sensors utilize common semiconductor manufacturing techniques that allow for high proof pressure, good linearity, great thermal shock performance and stability in a thin sensor package.