The DCX-22-CTD data loggers measure conductivity and temperature as well as pressure, along with the depth of bodies of water. The integrated Pt1000 achieves an accuracy of ±0,1 °C, and the conductivity can be measured at ± 2,5% of the selected range (0,2 / 2 / 20 / 200 mS/cm). Thanks to their long-life battery, they can keep recording measurement results for years (up to 10 years at a rate of one measurement per hour). The logger can be configured using the supplied software (measurement interval, incident management, delayed measurement start etc.) and data that has been read can be displayed in a graph or chart, corrected using air pressure values, converted into fill levels or other units, and exported.

The CTD versions of the DCX-22 range are autonomous battery-operated data collectors made of stainless steel. Requiring little maintenance, they record the water level (pressure), tempe- rature and conductivity over long periods. CTD stands for Conductivity, Temperature and Depth.

This data sheet specifies the additional conductivity measurement function which distinguishes the CTD version from the standard DCX-22. The pressure and temperature specifications are set out in detail in the data sheets for the DCX-22AA and DCX-22(SG/VG).

Conductivity is increasingly being monitored in conjunction with depth measurements, in which changes in water quality and depth are required to be detected simultaneously. Thus it is possible to detect contamination caused by salt water, waterborne particles or general pollutants when measuring groundwater levels.

KELLERʼs KOLIBRI Desktop programming and readout software is used to select a conductivity range (0...0.2 mS/cm, 0...2 mS/cm, 0...20 mS/cm or 0...200 mS/cm) and set the temperature coefficient for the medium. This process produces compensated conductivity measured values standardised at 25 °C.

DCX-22AA-CTD
The DCX-22AA-CTD data collector records groundwater levels using the AA (absolute- absolute) measurement method, whereby fluctuations in atmospheric pressure are measured and compensated for by the watertight atmospheric pressure sensor with its stainless steel dia- phragm. The advantage of this measurement method is that no humidity-sensitive capillary tube is required. As well, it is not required that the DCX-22AA-CTD be removed from the immersion tube in order to extract the data.

DCX-22-CTD
In the DCX-22-CTD, the sensor, electronics and battery are contained within the same housing. The data collector needs to be withdrawn from the immersion tube in order to extract the data. The DCX-22-CTD uses an absolute pressure sensor. For long-term measurements, where the impact of atmospheric pressure fluctuations is to be compensated, a second DCX, acting as a barometer, is placed at the surface to record changes in atmospheric pressure. The pressuredifference or, as appropriate, the water level is then calculated in the Kolibri Desktop Software by subtracting both measured values.

DCX-22(SG/VG)-CTD
The DCX-22SG/VG-CTD versions have a cable outlet with a readout plug, which is fixed to the surface of the measuring point with a locking disc. This means that the data logger does not have to be pulled out of the measuring point to read out the data. In the VG version (reference pressure measurement), the reference equalisation capillary tube in the cable is inserted until the read-out connector, where the reference opening protected by a Gore-Tex® diaphragm is located.

The KOBOLD level switch of model NEK is a complete functional unit which is specially designed for monitoring conductive liquids under extreme conditions. Due to the design without any moving or protruding parts, the switches are very suitable for monitoring critical media with, for example, solid content, negligible density or high viscosity.

The double-thread allows a variety of installations. The lengthof the shaft can be extended by attaching an additional protective tube. The instruments operate on the conductive principle of measurement. The conductive medium touches both electrodes causing a negligible alternating current to flow; the output state changes.

In the high-precision level probe of the 26X series, the temperature dependence and nonlinearity are precisely compensated for in the microcontroller by means of a mathematical model. In addition to the RS485 interface, the measurement results can also be output via the integrated D/A converter as a rangeable analog signal. Extended lightning protection is also available as an option.

The Series 46 X combines the ceramic measuring cell for low pressure ranges with the μP-elec- tronics of the digital Series 30 pressure transmitters. The signal values of the pressure- and temperature sensors are determined by a polynomial compensation1). The values can be shown and stored on a PC and can be reprogrammed. A reference tube integrated in the cable connects the referential chamber of the sensor with the ambient pressure.

The SZM type glass tube level indicator is applicable for the indication of liquid level in small and middle-sized, standing or lying round containers used in food, pharmaceutical and chemical industries. The loads occurring at the installation are absorbed by the outer armature, thus the glass tube is protected against breaking.

The outer armature also protects the glass tube against the mechanical impacts that may occur following the installation. It is recommended that the normal design level indicators be fitted on vessels containing pure liquids, while the  indicators mounted with cleaning stubs (a bottom, or bottom-top stub) be fitted on containers filled with contaminated liquid.

Installation length means the distance between the horizontal centre lines of the two fl anges, that is minimum 370 mm, and maximum 3 080 mm. The glass tubes longer than 1 500 mm are welded. The bottom, and top sealing of the glass tube is by two O-rings each, the material of which is to be chosen to be chemically compatible with the liquid measured.

Standard sealing material is FPM, whereas EPDM or NBR are available on request. The level indicator may be furnished with capacitive level sensors - max. 3 pieces over 100 mm - as requested (NAMUR design), which monitor the minimum and/or maximum level or any level along the scale.

Anodised aluminium rule with indication of level or volume may be mounted optionally on side of the outer armature. The scale can be engraved on the aluminium rule or the glass tube, or can be printed on a foil and to be attached to the glass tube or aluminium rule.

The level monitor model NSV has decisive advantages, especially with bulk goods with low bulk densitiy. Vibrations are induced in a stainless steel fork by a piezoelectric crystal. If the medium comes into contact with the vibrating fork, this vibration is damped.This damping is detected in a pluggable evaluation module and transformed into a potential-free limit contact. In addition to the standard version NSV-8200, the devices can also be provided for vertical installation with an extended neck pipe (NSV-8201).

The maximum length of the neck pipe is 3000 mm. The plug-in evaluation module can be changed easily so that the devices are really easy to maintain. Operation can be set for maximum or minimum security by means of a selector switch (A and B). The respective switching status of the relay is indicated by a LED.

This ultrasonic level transmitter is intrinsically safe (IS) and CSA rated for Class I Division 1 hazardous areas in the US and Canada. It has a maximum range of 25 feet (7.62 meters) and is typically used for tank level measurement but can also be used for other hazardous area applications such as measuring the roll diameter on coating machinery. The transmitter sensing element is chemically resistant and the electrical connection is a two-wire loop-powered 4-20 mA output. The SafeSonic 25-L is pre-calibrated from 1 and 25 feet but can be user-calibrated to other ranges using optional accessories.

These rugged, compact ultrasonic sensors inspired the “ToughSonic” name. They are Senix's flagship products with heavy-duty electronics epoxy potted into type 316 stainless steel housings, with permanently attached cables and ruggedized piezoelectric transducers. ToughSonic sensors are found on remote monitoring stations from the Australian outback to Alaskan oil fields. They are installed on heavy construction and farm equipment and in some of the harshest factory environments.  When an ordinary sensor just won’t do, you need a ToughSonic.

These rugged, compact ultrasonic sensors inspired the “ToughSonic” name. They are Senix's flagship products with heavy-duty electronics epoxy potted into type 316 stainless steel housings, with permanently attached cables and ruggedized piezoelectric transducers. ToughSonic sensors are found on remote monitoring stations from the Australian outback to Alaskan oil fields. They are installed on heavy construction and farm equipment and in some of the harshest factory environments.  When an ordinary sensor just won’t do, you need a ToughSonic.

These rugged, compact ultrasonic sensors inspired the “ToughSonic” name. They are Senix flagship products with heavy-duty electronics epoxy potted into type 316 stainless steel housings, with permanently attached cables and ruggedized piezoelectric transducers. ToughSonic sensors are found on remote monitoring stations from the Australian outback to Alaskan oil fields. They are installed on heavy construction and farm equipment and in some of the harshest factory environments.  When an ordinary sensor just won’t do, you need a ToughSonic.

These rugged, compact ultrasonic sensors inspired the “ToughSonic” name. They are Senix flagship products with heavy-duty electronics epoxy potted into type 316 stainless steel housings, with permanently attached cables and ruggedized piezoelectric transducers. ToughSonic sensors are found on remote monitoring stations from the Australian outback to Alaskan oil fields. They are installed on heavy construction and farm equipment and in some of the harshest factory environments.  When an ordinary sensor just won’t do, you need a ToughSonic.

Chem series sensors and SenixVIEW software put the power of ultrasonics in your hands. You can quickly adjust, optimize, save, and clone your applications quickly without calibration!

The CHEM 12 is housed in a rugged, chemically inert PVDF sealed housing for long life. A new shorter design and smaller diameter transducer allows for easier installation in tight locations, and measurements closer to the top of a tank. The CHEM 12 also has an improved rugged strain relief design.

Applications include pump control, bulk inventory, batch processing, water management and high/low-level alarms.

The NGR is a level sensor that uses TDR technology (time domain reflectometry) and thus can be used in oil- and waterbased liquids without calibration. The NGR’s guided radar uses time-offlight technology to measure electromagnetic pulses.

The time difference between the sent pulse and the reflected pulse is used to calculate the level, both as a continuous value (analogue output) and a freely positionable switching point (switching output). Due to its flexible probe that can be changed or cut, it is possible to integrate the sensor quickly into any application. The NGR can work in deposit-forming and foaming liquids. The sensor’s intuitive setup uses four buttons and a display to ensure quick and easy adaptation to the application.

The high-precision multi-parameter probes of the 36XiW-CTD series measure conductivity and temperature as well as pressure, along with the depth of bodies of water. Temperature dependence and nonlinearity are precisely compensated for in the microcontroller by means of a mathematical model. The integrated Pt1000 achieves an accuracy of ±0,1 °C, and the conductivity can be measured at ± 2,5% of the selected range (0,2 / 2 / 20 / 200 mS/cm). The sensors can be supplied with either an RS485 or SDI-12 interface. Extended lightning protection comes as standard with the SDI-12 and is available as an option for the RS485 interface.

The plastic level switch NKP is designed for economical control of liquids in vessels. Many industrial applications can be realized with two different plastic versions each with three different mountings. The switch is remarkable for its maintenance-free design, small dimensions and reed contacts with high switch capacity.

The switch is mounted on the side of the vessel. A hinged plastic float with a magnet floats up and down through the liquid level. The encapsulated reed contact is operated by the magnet. The switching function (N/O contact / N/C contact) is determined by the installation position. The switching function is reversed by simply rotating the switch through 180°.

NGM uses TDR (Time Domain Reflectometry) technology, which is also known as Guide Microwave or Guided Wave Radar. This means that low-energy and high-frequency electromagnetic impulses, generated by the sensor’s circuitry, are propagated along the probe which is immersed in the liquid or solid to be measured.

When these impulses hit the surface of the media, part of the impulse energy is reflected back up the probe to the circuitry which then calculates the level from the time difference between the impulses sent and the impulses reflected. The sensor can output the analysed level as 4 ... 20 mA analogue output, or it can convert the values into freely programmable switching output signal.

The ToughSonic CHEM 20 is an ultrasonic sensor designed for measurement applications involving corrosive chemical liquids or gasses, but it is an excellent choice for benign materials as well. With a maximum range of 20 feet (6.1 meters), it is the mid-range option within the ToughSonic CHEM sensor family. The sensor is sealed in a PVDF (Kynar®) housing. It’s fully submersible, chemical resistant and shock resistant. The ToughSonic CHEM 20 has a permanently attached, potted-in-place 9-wire cable that allows up to six simultaneous serial, analog and/or switch outputs. It’s fully configurable with SenixVIEW configuration and analysis software.

CHEM series sensors and SenixVIEW software put the power of ultrasonics in your hands. You can quickly adjust, optimize, save and clone your applications quickly without calibration! These sensors are housed in a rugged, chemically inert PVDF sealed housing for long life. They mount above the material surface and measure distance downward without contact. Outputs respond to that measured distance. Applications include pump control, bulk inventory, batch processing, water management and high/low level alarms.

The ToughSonic CHEM 35 ultrasonic sensor is designed for distance measurement applications where corrosive chemical liquids or gasses are present, but it is an excellent sensor for benign environments as well. With a maximum range of 35 feet (10.7 meters), it is the longest range member of the ToughSonic CHEM sensor family. The sensor is sealed in a PVDF (Kynar®) housing. It’s fully submersible, chemical resistant and shock resistant. The ToughSonic CHEM 35 has a permanently attached, potted-in-place 9-wire cable that allows up to six simultaneous serial, analog and/or switch outputs. It’s fully configurable with SenixVIEW configuration and analysis software.

CHEM series sensors and SenixVIEW software put the power of ultrasonics in your hands. You can quickly adjust, optimize, save and clone your applications quickly without calibration! These sensors are housed in a rugged, chemically inert PVDF sealed housing for long life. They mount above the material surface and measure distance downward without contact. Outputs respond to that measured distance. Applications include pump control, bulk inventory, batch processing, water management and high/low level alarms.

The ToughSonic CHEM 10 is a chemically resistant ultrasonic sensor designed for applications where corrosive liquids or gasses are present, but it is an excellent choice for benign environments as well. With a maximum range of 10 feet (3 meters), it is the smallest sensor in the ToughSonic CHEM sensor family. The ToughSonic CHEM 10 is sealed in a PVDF (Kynar®) housing. It is fully submersible, chemical resistant and shock resistant. It has a permanently attached, potted-in-place 9-wire cable that allows up to six simultaneous serial, analog and/or switch outputs. It is fully configurable with SenixVIEW configuration and analysis software.

Chem series sensors and SenixVIEW software put the power of ultrasonics in your hands. You can quickly adjust, optimize, save and clone your applications quickly without calibration! These sensors are housed in a rugged, chemically inert PVDF sealed housing for long life. They mount above the material surface and measure distance downward without contact. Outputs respond to that measured distance. Applications include pump control, bulk inventory, batch processing, water management and high/low level alarms.

The ToughSonic 14 ultrasonic sensor has a maximum range of 14 feet (4.3 meters). Like all ToughSonic sensors, it’s built for durability and ease of use in tough industrial environments. It’s fully submersible, corrosion resistant, shock resistant and all around tough. It’s also fully configurable with our SenixVIEW software. ToughSonic 14s include our famous “Teach” feature for push button configuration. This compact sensor is used around the world on remote liquid level systems, heavy equipment, factory automation applications and more. This is our most popular sensor.

For longer range applications or for chemically resistant sensors, please see our full line of ToughSonic and ToughSonic CHEM sensors.

The DCX-25 PVDF is an autonomous, battery powered instrument designed to record water depth (pressure) and temperature over long periods. The housing is made of polyvinylidene fluoride and the sensing diaphragm is available in either Hastelloy C-276 or titanium 6AL-4V. This combination of wetted materials ensures compatibility with even the most aggressive media

This data collector (Ø 25 mm) integrates a pressure sensor, electronics and battery in one housing. The electronics employ the latest microprocessor technology, which give high accuracy and resolution for the pressure and temperature signals. The built-in pressure sensor is mathematically compensated for all linearity and temperature errors. The use of a non-volatile memory ensures high data security.

The DCX-25 PVDF works with an absolute pressure sensor. For installation, the data collector is secured by a suspension cable and immersed into the media to be measured and must be recovered for data readout. In shallow water, where the influence of barometric pressure changes should be considered, it is recommended that a second data logger (e.g. DCX-22 Baro) is placed at the surface to record the barometric pressure. The Logger PC software then calculates the water depth by subtracting the two measured values. The housing of the data logger can be opened easily without any tools, thus allowing quick access to the replaceable battery and the interface connector for configuration and data download.

Interface with a PC is accomplished using one of Keller’s converter cables which are available in either RS232 connection (K103A) or USB connection (K104A). The necessary converter drivers are included with converter purchase, along with the Keller Logger software. This intuitive software provides the capability to customize the instrument, as needed, for each installation. Users can configure the DCX-25 PVDF to record at fixed time intervals, using fixed or eventbased start times, in user-selectable measurement methods to ensure that only the most useful and meaningful data is collected and stored.

For applications that do not require highest compatibility with aggressive media, Keller offers the DCX-16, DCX-18, DCX-22 and the DCX-38.

The DCX-38 VG is an autonomous instrument for recording water level with a high resolution and full scale ranges as low as 0,5 mWC / 50 mbar. It features a rugged, gold-plated ceramic diaphragm for outstanding long-term stability and stainless steel housing with user serviceable battery for long service life.

Configuration / Data Retrieval:
For data readout, the serial interface is accessed via the data port located on one end of the cable, enabling on site data retrieval. Using either the K-104A or K-103A converter cable, the DCX-38 VG connects easily to a laptop or PC via USB or serial port. Used in conjunction with Logger 4.X software, the DCX-38 VG is configured and data retrieved either in the lab or the field

The DCX-18 ECO is an autonomous, rechargeable battery powered instrument. It features a stainless steel 18 mm in diameter housing designed to record pressure (water depth) and temperature over long periods at a very economical price. Its small size, rechargeable battery, fully welded housing and the relative sensor option are just a few of the many advantages provided by the DCX-18 ECO.

The electronics employ the latest microprocessor technology which give high accuracy and resolution for the pressure and temperature signals. The measured values are mathematically compensated for all linearity and temperature errors of the pressure sensor. The use of a non-volatile memory for data storage ensures high data security.

DCX-18 ECO

The sensor, electronics and the rechargeable battery are housed in a fully welded stainless steel tube for submersible deployment. For data read-out, the DCX-18 ECO must be recovered from the measurement point. The end cap, sealed by two O-Rings, must then be removed to access the serial interface. The DCX-18 ECO works with an absolute pressure sensor. In shallow water depths where the influence of barometric pressure changes should be considered, it is recommended that a second data logger (Baro) is placed at the surface, to record the barometric pressure. The PC then calculates the differential pressure resp. the water depth by subtracting the two measured values.

DCX-18 ECO with cable (DCX-18 ECO SG or DCX-18 ECO VG)

An optional cable is available for the DCX-18 ECO, enabling data retrieval or configuration and charging the battery without removing the data logger. For relative measuring devices, the cable incorporates a capillary tube which enables venting the relative sensor.

Rechargeable Battery:

The DCX-18 ECO is charged over the USB connection with the K-104M converter connected to PC. For fast charging, connect the power supply unit or the car charging adapter to the converter. The charge status is displayed in the logger software

The DCX-22 is an autonomous, battery powered instrument made of stainless steel designed to record water depth (pressure) and temperature over long periods. Two versions are offered:

DCX-22
The sensor, electronics and battery are housed in a sealed stainless steel tube, for submersible deployment. For data read-out the DCX-22 must be recovered from the measurement point. The O-ring sealed end cap is then removed to access the data port.
The DCX-22 works with an absolute pressure sensor. In shallow water depths where the influence of barometric pressure changes should be considered, it is recommended that a second data collector DCX-22 (Baro) is placed at the surface, to record the barometric pressure. The PC then calculates the differential pressure resp. the water depth by subtracting the two measured values