Water Level Sensors | Process Transducers | Digital Indicators | Autonomous Loggers | Calibration | OEM Sensors


 

Keller is a manufacturer of media-isolated Piezoresistive pressure transducers.
The major advantage of Keller Sensors is their built-in lightning and surge protection and their flexible manufacturing process.
Transducers assembled in the US generally have 1-2 week lead times.

 


Water Level Sensors

Acculevel


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The Keller Acculevel is a flexible, high-accuracy, submersible pressure transmitter. The extremely rugged body is available in 316 Stainless Steel, Hastelloy, and Titanium for corrosion resistance. The Acculevel is ideal for applications ranging from hydroelectric reservoir recording to drop-in tank level monitoring.

Available pressure ranges: user-selectable from 0-3 to 900 ft of water
Accuracy: 0.25% FS TEB, Optional Accuracy: 0.1% FS
Temperature compensated -10°C to 80°C
Electrical Input: 8 – 28V DC with built-in lightning/surge protection.
Output: RS-485 and 4..20 mA or 0-5V or 0-10V
Physical Dimensions Ø0.825″ x 4.3″
Cable: Hytrel jacketed, Shielded, vented 5-wire. Ø0.23″. User-replaceable.
MODBUS Compatible.
A 1/2″ conduit fitting is available for all Keller transducers.

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Microlevel


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The Keller Microlevel is the smallest diameter submersible transmitter in its class. Ideally suited for down-hole and driven well applications the Microlevel combines all the advantages as the Acculevel into a smaller, more convenient package.

Available pressure ranges: user-selectable from 0-3 to 900 ft of water
Accuracy: 0.25% FS TEB, Optional Accuracy: 0.1% FS
Temperature compensated 0°C to 80°C
Electrical Input: 10 – 30V DC with built-in lightning/surge protection.
Output: RS-485 and 4..20 mA
Physical Dimensions Ø0.63″ x 4.9″
Cable: Hytrel jacketed, Shielded, vented 5-wire. Ø0.23″. User-replaceable.
MODBUS Compatible.

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Digilevel


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Click Here for Digilevel EC
The Keller Digilevel and the Digilevel EC transducers combine Keller’s high-accuracy piezoresistive sensors with an intelligent SDI-12 digital interface for compatibility with equipment already installed in the field. The Digilevel EC was developed in conjunction with Technel Engineering to meet Environment Canada’s requirement for a field-replacable 3/8″ atmospheric reference tube.
Both transducers include a newly designed anti-fouling flush diaphragm to resist algae growth and silting.

Available pressure ranges: user-selectable from 0-3 to 900 ft of water
Accuracy: 0.1% FS TEB, Optional Accuracy: 0.1% USGS OSW specification
Temperature compensated -10°C to 60°C
Electrical Input: 8 – 28V DC with built-in lightning/surge protection.
Output: SDI-12 v1.3 with emulation modes for Tavis, Design Analysis, and Pressure Systems/Esterline transducers.
Physical Dimensions Digilevel: Ø1″ x 8.9″, Digilevel EC:  Ø2.5″ x 10.5″
Cable: Hytrel jacketed, Shielded 4-wire. Ø0.23″. User-replaceable. SEACON connector on Digilevel EC.

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Nanolevel

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Ideal for low-range water level monitoring such as estuary research or pump control applications, this ceramic capacitive sensor allows precise measurement with the very high overpressure protection required for sensor durability.

Available pressure ranges: user-selectable from 0-4 to 120 inches of water
Accuracy: 0.25% FS TEB, Optional Accuracy: 0.1% FS
Temperature compensated 10°C to 50°C
Electrical Input: 8 – 28V DC
Output: RS-485 and 4..20 mA
Physical Dimensions Ø1.5″ x 2.5″
Cable: Hytrel jacketed, Shielded, vented 5-wire. Ø0.23″. User-replaceable.
MODBUS Compatible.
A 1/2″ conduit fitting is available for all Keller transducers.

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LevelRat


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The Keller LevelRat was developed in response to the need for a durable, non-stick, abrasion resistant flush diaphragm for high grease and solids content sewage lift stations. The resultant formed Kynar® diaphragm design is ideal for other applications such as slurry tanks and landfill monitoring as it is a much more durable material than standard Teflon-coated rubber solutions while retaining the anti-fouling properties.

Available pressure ranges: user-selectable from 0-5 to 100 ft of water
Accuracy: 1% FS TEB
Temperature compensated -10°C to 80°C
Electrical Input: 8 – 28V DC with built-in lightning/surge protection.
Output: 4..20 mA and 0-5V or 0-10V
Physical Dimensions Ø1.26″ x 4.3″
Cable: Hytrel jacketed, Shielded, vented 3-wire. Ø0.23″. User-replaceable.
A 1/2″ conduit fitting is available for all Keller transducers.

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Levelgage


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A lower-cost analogue-only alternative to the Acculevel, the Keller Levelgage is every bit as durable and reliable as other transducers in this series.

Available pressure ranges: user-selectable from 0-3 to 900 ft of water
Accuracy: 1% FS TEB, Optional Accuracy: 0.5% FS
Temperature compensated -10°C to 80°C
Electrical Input: 8 – 28V DC with built-in lightning/surge protection.
Output: 4..20 mA and 0-5V or 0-10V
Physical Dimensions Ø0.825″ x 4.3″
Cable: Hytrel jacketed, Shielded, vented 3-wire. Ø0.23″. User-replaceable.

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Econolevel


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This OEM-grade water level sensor is the lowest-cost solution we are able to provide. As a result, a minimum order quantity of 25 applies to this OEM product. This product does not include the electrical surge suppression which is standard on most other Keller transmitters.

Available pressure ranges: set ranges 0-11.5, 34.5, 115.5, and 231 ft of water
Accuracy: 1% FS TEB, Optional Accuracy: 0.5% FS
Temperature compensated 0°C to 50°C
Electrical Input: 8 – 28V DC
Output: 4..20 mA
Physical Dimensions Ø0.825″ x 2.9″
Cable: Hytrel jacketed, Shielded, vented 2-wire. Ø0.23″. User-replaceable.

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Process Transducers

Assembled in America


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Keller’s range of industrial transducers assembled in the USA have fast delivery times, reasonably high accuracy, a flexible list of features and options and convenient NPTm process connections. The Preciseline features a MODBUS compatible RS-485 output, the Valueline is a rugged and reliable high-accuracy analogue pressure transmitter, and the Econoline is excellent for high-volume low-cost OEM applications.

Available pressure ranges: 0 – 2 to 15,000 psi absolute, gauge, or sealed gauge.
Accuracy: from 1% FS to 0.1% FS TEB
Electrical Input: 8 – 28 V DC with surge protection
Output: 4..20 mA, 0 – 5V, or 0 – 10V. Preciseline has digital RS-485 as well.
1/4″ NPTm standard, others available.

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33 Series


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Keller’s range of high accuracy process transducers use high-end digital compensation techniques to produce extremely accurate and reliable transducers. Models are available in materials such as 316 SST, Hastelloy and Titanium to suit your application. User-specified o-ring materials or seal-less brazed or welded transducers are also available.

Available pressure ranges: Barometric, 1 bar, to 1000 bar (14,500 psi) absolute, gauge, or sealed gauge.
Analogue Accuracy 0.1% FS TEB
Digital Accuracy 0.05% FS, Optional 0.01% FS Precision
Electrical Input: 3.5 – 28 V DC
Output: RS-485 and 4..20 mA or 0 – 2.5V, 5V, 10V or 0.1 – 2.5V
G1/4″ (BSPP) or G1/2″ male threaded connections are standard.
ATEX Ei Flameproof, intrinsically safe, or Ex Explosion Proof rated brazed or welded diaphragm transducers are available.
MODBUS Compatible

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23 Series


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Keller’s 23 series process transducers use analogue electronics to compensate for zero offset, sensitivity, and temperature effects. Frequency response can be up to 5 kHz compared to the 400 Hz response of the digital transducers.

Available pressure ranges: Full Vacuum to 1000 bar (14,500 psi) absolute, gauge, or sealed gauge.
Accuracy: 0.1% FS
Electrical Input: 8 – 28 V DC
Output: 4..20 mA, 0..20 mA, or 0 – 10V
G1/4″ (BSPP) or G1/2″ male threaded connections are standard.
ATEX Ei Flameproof, intrinsically safe, or Explosion Proof rated brazed or welded diaphragm transducers are available.

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Wet/Wet Differential

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Using the same electronics as the 33 series or 23 series process transducers, Keller has developed a highly accurate wet/wet differential transducer. Keller’s dual-diaphragm differential cell is available in 316 SST, Hastelloy and Titanium

Available pressure ranges: 1 to 30 bar differential with 200 or 600 bar static line pressure.
Achieveable Accuracy 0.05% FS TEB
G1/4″ female threaded connections both sides.
Overpressure protection is smaller on reference side of transducer than pressure side.

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41X


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Keller’s high-resolution low-range capacitive sensor is also available for process applications in the form of the Keller Series 41X.

Available pressure ranges: 30 mbar, 100 mbar, 300 mbar, gauge, differential, or sealed gauge.
Accuracy 0.1% FS TEB
Electrical Input: 8 – 30V DC
Output: RS-485 and 4..20 mA or 0 – 10V
G1/4″ (BSPP) male threaded connection is standard.
ATEX Ei intrinsically safe transducers are available.
MODBUS Compatible

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Digital Indicators

Data Logging

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The Keller LEO Record is a high accuracy, standalone data-logging digital pressure gauge. Using an internal Lithium battery and Keller ‘s high quality piezoresistive or capacitive pressure sensors the LEO Record is excellent for a wide range of applications.

Data-logging of up to 57,000 data points is achieved using non-volatile memory and either time-based or event-based recording techniques can be used depending on your application.

Available pressure ranges: -1 – 3 bar to 0 – 1000 bar
Accuracy: 0.1% FS
Operating temperature: 0 – 50°C
Digital interface: RS-485
Battery life: up to 2 years
ATEX Ei rated intrinsically safe, wash-down rated IP-65.

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Digital Gauges

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Keller manufactures a wide range of digital pressure indicators from 1.3″ x 0.7″ x 0.4″ OEM displays to 3″ diameter high accuracy gauge. Keller gauges use an absolute or sealed gauge reference which can be manually reset. Keller gauges are wash-down rated (IP-65).

Features include Tare functions, Peak or Min/Max recording mode, and o-ring swivel seal to allow rotation even under pressure. Battery life is typically 1000 hours of continuous operation when not in recording mode.

The Keller ECO 1 has an accuracy of 0.5% FS, a dial size of 2.3″ and includes the o-ring swivel seal feature. Pressure ranges from full vacuum to 300 bar.

The Keller LEO 1 has an accuracy of 0.2% FS, a dial size of 3″. Pressure ranges from full vacuum to 1000 bar.

The Keller LEO 2 has an accuracy of 0.2% FS, a dial size of 2.3″ and includes the o-ring swivel seal feature. Pressure ranges from full vacuum to 700 bar.

The Keller LEO 3 has an accuracy of 0.2% FS, a dial size of 3″.
Pressure ranges from full vacuum to 300 bar.
The LEO 3 is powered by a 4..20 mA transmitter signal loop. The analogue output can be scaled using the display’s menu functions. RS-485 output is MODBUS compatible.

The Keller LEX 1 has an accuracy of 0.05% FS or optional precison 0.01% FS, a dial size of 3″.
Pressure ranges from full vacuum to 1000 bar.
Uses an RS-485 interface for program and read functions.

The Keller MANO Gauge has an accuracy of 0.1% or optional 0.05% FS, a dial size of 3″.
Pressure ranges are available in vented gauge from -1 to 2 bar up to 700 bar and sealed gauge up to 1000 bar.
Optional output signals are 4..20 mA, 0-10V, or RS-232. Datalogging function also available.

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Digital DisplaysClick Here for datasheet

The Keller EV-120 Digital Display interfaces with any Keller transmitter with RS-485 output for high accuracy local indication. This display can either power the transmitter with an internal 9V block battery or can itself be powered by the 4..20 mA current loop.

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Autonomous Loggers

GSM2


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The Keller GSM2 is an Autonomous Data Logger designed to be installed at the top of a 2″ or larger borehole tube. What makes the GSM2 unique is the cell phone tower data uplink which allows the unit to e-mail readings directly to your office at a predetermined time interval. Configuration files can be e-mailed back to the unit to update settings as needed.

Designed to work with a low-power Keller RS-485 transmitter such as the Acculevel, the GSM2 provides uninterrupted operation for years in the field. Pre-determined alarms (such as high or low water) can be set to send a pre-programmed text message to a cellular telephone. This feature is excellent for flood warning systems, reservoir monitoring, or municipal water main monitoring.

Inputs: RS-485, SDI-12, 2x 0-2.5VDC
Power Supplies: Switched 3.7VDC, 5VDC, 12VDC, Always on 3.7VDC
Battery Life: up to 10 years at 1 measurement/hour and 1 transmission/day
Accuracy: Governed by accuracy of the attached Sensor
Barometer Accuracy: ± 0.05 kPa
Barometer Stability: ± 0.1 kPa/year

The GSM2 saves you time and money by reducing on-site visits and allows you to access your data in near real time as necessary.

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DCX Data Loggers


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Keller offers a wide range of self-contained water level loggers – The 18 mm diameter DCX-ECO along with DCX 16 mm, DCX 22 mm. Using elements from the Acculevel, Nanolevel, and even the wet/wet differential process transducers for completely maintenance-free high-accuracy logging.

The Keller DCX-ECO offers an innovative rechargeable battery with up to 3 years battery life and quick 1-hr recharge time.

Temperature and Pressure logging.
Available pressure ranges: user-selectable from 0.5 – 100 meters of water, vented or sealed sensors available.
Accuracy: 0.1% FS typical.
Temperature compensated, generally -10°C to 40°C see datasheet.
Battery Life: 3 years to 10 years depending on model. Lithium or Rechargeable.
Programming/Reading Interface: RS-485
Internal memory for up to 57,000 data points with time-based or event-based recording options.
Logger diameters from Ø0.65″ to Ø1.5″

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Calibration Systems

Keller CALI LP / MP / HP


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Keller provides a convenient, portable solution for calibration of their standard accuracy pressure transducers and depth sensors. Powered by a lithium battery (included) this lightweight calibration system is good for 200 hours of continuous operation before the battery needs to be changed. Like Keller’s digital indicators, battery change can be accomplished easily and without tools.

The Full-version system includes a transmitter power and input loop with the Standard-version does not. The Full-version requires additional 9V batteries or an AC power supply.

Accuracy is 0.1% FS which is good for transducers with error bands 0.5% FS and greater or two-point calibration checks on higher pressure transducers.

The Keller CALI LP is a pneumatic system with hand pump and vacuum pump.
Pressure ranges from -1 bar to 10 bar

The Keller CALI MP is a pneumatic system with screw pump.
Pressure ranges from -1 bar to 25 bar

The Keller CALI HP is a hydrualic system with screw pump.
Pressure ranges to 700 bar

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OEM Sensors

Standard


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Available in 316 SST, Hastelloy, Titanium, Platinum and custom materials,
Keller’s high quality Swiss-made piezoresistive pressure sensors are available for custom and high-volume OEM applications. Multiple different package sizes from Ø19 mm to Ø9.5 mm are available to suit your application. Keller OEM sensors are available with analogue compensation circuitry inside the sensor housing for an additional surcharge.

Available ranges: 0.1 to 1000 bar absolute or sealed gauge, 0.1 to 20 bar gauge and differential
Typical accuracy: 0.5% FS
Sensitivity: 200 mA FS with 1 mA regulated input (3.5V typical)

Available with integrated analogue compensation circuitry upon request.

Minimum order quantity may apply, Technel stocks some ranges of these transducers for your convenience.

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Laser Welded

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Keller L-series sensors feature a crevice-free laser-welded diaphragm designed to reduce fouling in flush mount applications.

With all the features of the standard Keller sensors the L-series increases the versatility of Keller’s extensive product offering.

 

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Signal-conditioned


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Keller 9LX and 30X series OEM pressure transmitters include Keller’s microprocessor based signal conditioning circuitry and arrive from the factory calibrated and ready to use. Standard material is 316 SST, Hastelloy C, Titanium, Platinum, and custom materials are available upon request.

Available pressure ranges: standard increments from full vacuum to 1000 bar
Typical Accuracy: 0.05% FS digital 0.1% FS analogue, Optional Accuracy: 0.025% FS
Electrical input: 3.3 to 28V DC depending on options.
Outputs: RS-485 and 4..20 mA or 0 – 10V DC.
MODBUS compatible.

Minimum order quantity may apply.

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Accuracy Statements

Accuracy / T.E.B.

Keller defines the accuracy of their transducers in terms of the Total Error Band.
Keller’s T.E.B. includes the combined effects of non-linearity, hysteresis, non-repeatability and thermal dependencies over the compensated temperature range of the transducer.

Total Error Band is expressed as a percentage full scale of the Basic Range of the sensor installed in the transducer. Each intermediate range is achieved by re-scaling the analogue output of the transducer then calibrating within the range requested. Contact us for the values of the basic ranges if this information is not listed on the datasheet.

Precision

Keller defines Precision as the ability of their transducers to follow their 250ppm of reading industrial primary standards within the stated error band. Technel can arrange calibration to a better standard for an additional fee. Calibration turn-around is typically 1-2 weeks.