Nivelco Instruments – Refrigeration and Cooling

Nivelco Process Instruments for Refrigeration and Cooling Process

Updated October 11, 2014 with video

Nivelco and Aqua Technology Group can provide all you instrumentation needs for refrigeration, ammonia cooling and related processes.


The Nivelco Refrigeration and Cooling process diagram below illustrates a cooling technologic process commonly used in food, chemical and pharmaceutical industrial plants.

Instruments for Ammonia Refrigeration Plant

On the process diagram can be seen the cooling compressor applying ammonia, the circulating pump system and the liquid separator tank with the proposed Nivelco devices.

Nivelco Product Used

Instrumentation of the compressor:

  • The measurement of the pressure on the suction and pressure side is accomplished by NIPRESS DRC-3xxx type pressure transmitter
  • The measurement of the temperature is completed by THERMOCONT TTJ-Sxxx temperature transmitters
  • The suction side pressure transmitter performs the power control or the compressor, while the pressure side transmitter controls the condenser

Instrumentation of the liquid-separator:

  • The continuous level measurement is executed by NIVOCAP CTR-2xxx type capacitive level transmitter
  • This device controls the feeding valve applying me UNICONT PMM-311 type controller
  • The upper and lower failsafe switching is executed by NIVOMAG MKA-210 type level switches,
  • As high level is reached, the compressor shuts off, while at low level the ammonium pump is stopped.

Instrumentation of the liquid tank:

  • The instruments and procedure is similar to the separator but a NIVOTRACK MRC-5xxx type level transmitter is recommended due to the high pressure (16 bar)

Instrumentation of the cooling water:

  • A continuous level measurement is accomplished with EchoTREK SGA-3xxx type ultrasonic level transmitter, the level in the tank is kept constant by the help of a UNICONT PMM-311 type controller by actuating a supplementary water valve
  • The continuous conductance measurement is executed with an ANACONT LGK-2xxx type device,
  • The conductivity or cooling water is permanently increasing due to the evaporation in the condenser, so at a predetermined value, the PMM-311 controller opens the emptying as well as the supplementary valve
  • The low and high failsafe NIVOSWITCH RFM-401 type switches protect the pump and issue the alarm signals.

Instrumentation of the condenser:

  • The level control of the water tank under the condenser is accomplished by a NIVOCONT KKH-222-5 type level switch.


48 Hour Meter Delivery and On Site Install

Aqua Technology Group is committed to meeting our customer needs and responding on their timeline.  Sometimes this means going the extra mile with a quick delivery and install. And by quick, we mean 24 hour delivery and next day installation.


The Challenge

Wright State University Marquee

Wright State University

We were contacted by Wright State University at 2:30 on a Thursday afternoon and advised they needed a flow meter on a 12” potable drinking water supply from a public utility. The other important detail that was quickly revealed was the flow meter had to be on line and running by Sunday morning at 7:00 am. Experience and confidence in our solutions and  our team at Aqua Technology Group prepared our reply without flinch or hesitation, “We’ll be there and have you up and running by Saturday”. OK we did gasp just a bit!

Our Solution

We immediately went on site and assessed the measurement application. Cutting into the line and installing a meter would not fit into the time line for this installation. An insertion paddle wheel style meter simply wouldn’t do for the accuracy required or the piping configuration. We decided on a Dwyer Instruments transit time ultrasonic clamp on flow meter for the application. This included the Dwyer UXF2-11P1 Ultrasonic flow converter, SX3-D0 Ultrasonic Flow Sensors and a pair of SX3C-2B Sensor Cables. Meter accuracy was also critical to this 48 hour application. Wright State needed to have a highly accurate meter accepted for billing purposes by the utility. We coordinated with the City of Fairborn and determined a Dwyer meter would meet the application and satisfy the billing requirements.

By Saturday afternoon we had the meter installed and accurately measuring flow. A 48 hour meter delivery and installation!

We not only sell great products and solutions, we partner with great suppliers, field engineers and team members who understand that normal deliveries do not always fit the in the real world time loop.

We always appreciate having adequate time to work and resolve tough installation issues. However, Aqua Technology Group is on your side even when time is not. Our onsite field service engineers will travel to your application and provide professional service even on short notice when time is critical. Go ahead and contact us with your tough time critical applications. We will do our best to meet and exceed your expectations.

Aqua Technology Group is on your side even when time is not.

Get this Ultrasonic Flow Meter Solution!

  • (required)
  • (required)
  • (optional)
  • Tell us about your project. Part numbers and other details here earn bonus points!
  • Accepted file types: jpg, gif, png, pdf, dwg, dxf, doc, docx, xls, xlsx.
    We accept pdf, dwg, dxf, doc, docx, xls, xlsx, jpg, gif, png
  • (MM/DD/YYYY) When do you need the quote or info by?

Nivelco Instruments for Wastewater Treatment

Wastewater Treatment Plant Instruments from Nivelco



Nivelco and Aqua Technology Group can provide all your instrumentation and control needs for collection systems, liftstations and pumps, package plants and wastewater treatment plant. This diagram of the wastewater treatment process details two separate sections: wastewater treatment processes and slurry treatment processes.

wastewater treatment plant instruments process diagram


The sewage is collected in lifstations, underground sumps or pits, also known as wetwells, and is pumped to the sewage treatment plant.

Measurement and control tasks:
Reliable level measurement is necessary to provide pump start and stop signals with fail safe switch-off points to avoid dry running.


The  EasyTREK SP type non-contact ultrasonic level transmitter models with IP68 ingress protection is Nivelco’s recommendation for this measurement task.

Another popular choice for liftstations or deep sumps is the flush mounted  NIVOPRESS NC  type
hydrostatic borehole transmitter or the NIVOPRESS NP  series with recessed membrane equipped with a sewage adaptor working on the principal of the diving bell.

Nivelco NIVOPRESS N NIVOPRESS D transmitter

A  PLC  or our  MultiCONT  process controller unit is ideal to process the analogue 4…20 mA signals and to control the switching points. For fail-safe protection, the robust NIVOFLOAT NWP float level switches are recommended.

Nivelco Nivofloat and Nivocont


The sewage pumped in from the network contains a lot of organic and non-organic materials in suspended form as well as in solution. This pollution has to be removed. The particles are filtered with a mechanical screen. The dissolved pollution can be reduced by adding coagulant materials. The reduced slurry is then separated from the water in the sedimentation tank.
The purified sewage can be streamed to any natural water after chemical inspection and yield measurement.


  • Ultrasonic level transmitters for level measurement (2-wire integrated  (blind) or compact versions), EchoTREK or EasyTREK
  • For the control of the mechanical screen a differential system with 2 ultrasonic level transmitters is recommended
  • The  AnaCONT  range of analytical measurement devices is ideal for the chemical analysis of the cleaned water
  • Open channel flow metering can be done using our  Parshall flume, and  EasyTREK level transmitter.
  • Nivelco EasyTREK Echo-TREK ultrasonic transducers
  • For the calculation and data logging a MULTICONT PEW controller can be used.
  • High and low level switching will be performedwith NIVOSWITCH vibrating fork sensors



The slurry separated in the sedimentation tank istransferred to the digester tank. The emitted biogas is stored in a biogas tank and then fed to a biogas generator. The biogas section of the plant is classified as a hazardous environment. The slurry retained in the digester is transported from the plant after dewatering (dehydration)


  • ATEX certified ultrasonic level transmitters(EchoTREK  or  EasyTREK) or ATEX certified guided microwave level transmitter (Micro-TREK) can be used for level measurement.
  • Nivelco’s choice for measuring the temperature of biogas is the ATEX certified temperature transmitter THERMOCONT TTJ Ex.
  • Nivelco recommends an ATEX certified pressure transmitter for measuring the biogas pressure the NIVOPRESS DT Ex

Nivelco Water Wastewater Instrument Selection

Nivelco Field Instruments In Measurement Systems


Water Treatment Plant Instruments from Nivelco – Potable Water Production

Nivelco Process Instruments for Water Treatment Plants – Potable Water Production

instruments for water treatment plant


Nivelco and Aqua Technology Group can provide all your instrumentation needs for production wells, purification, treatment, and distribution system.

water treatment plant instruments technical description


The production wells are drilled in ground layers rich in water, the pumps are lowered into the wells to pump the raw water to the central water treatment facilities.

  • Measuring tasks:
  • Continuous level measurement of the well
  • Temperature measurement of the water
  • Hydrostatic pressure (water level) of the production well
  • Flow of the produced water
  • Dry-run protection of the pumps


  • Hydrostatic level transmitters that combine level and temperature measurement: the NIVOPRESS N transmitter family.
  • Piezoresistive pressure transmitters: NIVOPRESS NZK types
  • Water input measurement: ISOMAG electro-magnetic flow meters


The raw water pumped from the production wells contains different organic and inorganic materials. These materials have to be removed from the water. Removal is done either by mechanical filters or by adding coagulant materials to the water to help precipitate the contaminating materials. The resulting slurry is separated in settling tanks. The clean water is often passed through sand or other final filtration stages.



To move water out to the distribution system and to the customers, the pressure in the system has to be increased. This is done by booster pumps, water towers or air charged pressure vessels with compressed-air pumps.


Nivelco Field Instruments In Measurement Systems


Aqua Technology Group is proud to offer quality Nivelco process instruments.


Non-contact MicrowavePiloTREK
Guided MicrowaveMicroTREK
Ultrasonic CompactEchoTREK for liquids
EchoTREK for solids
Ultrasonic IntegratedEasyTREK for liquids
EasyTREK for solids
Hydrostatic pressureNIVOPRESS D
NIVOPRESS N – borehole transmitter
ConductiveNIVOCONT K
Magnetic CouplingNIVOMAG
Magnetic TrackingNIVOPOINT
VibratingNIVOCONT R – vibrating rod
NIVOSWITCH – vibrating fork
Rotary PaddleNIVOROTA
pH and ORP transmittersAnaCONT LE
Conductivity transmitterAnaCONT LEK / LCK
Loop indicatorUNICONT PDF
Controller/IndicatorUNICONT PMM
Controller / Programmer / IndicatorMULTICONT
Pressure transmitterNIPRESS
Hydrostatic pressureNIVOPRESS D
Temperature sensorTHERMOCONT TN
Current Controlled SwitchUNICONT PKK
Ultrasonic Proximity SensorMICROSONAR
Universal Interface ModuleUNICONT PJK-100
Power supplyNIPOWER
Process visualization softwareNIVISION
Ultrasonic Two-part SystemNIVOSONAR