Cold Water Supply System (CWSS)

| What?  

This instantaneous system is capable to supply inlet water at constant desired temperature (without regard to the flow rate) by a mixing system, and it is suitable for strict and accurate sanitary tests.

| How?

CWSS units are intended to support the laboratory sanitary tests requiring an high accuracy degree on environmental water temperature conditions according to strict European Standards. The system acts as cool water supplier at a desired temperature by a fine regulation and it works buffering and adjusting in a proportional way the action of a chiller, of whom overcomes the limits.

| Where?

In the laboratory.

| Who?

  • Manufacturers of gas and solid fuels boilers
  • Certification laboratories

| Which?

CWSS units are suitable for laboratory and R&D test benches (boilers and water heaters).

| Why?

  • Product certification costs reduction
  • Time to market reduction
  • Performance calculation
  • Preparation for product certification
  • Quality tests improvement
  • Research and development of new products
  • Full automatic control of water temperature regulations
  • Benchmarking
  • Market credibility

| Tests

  • Hydraulic sanitary cuircuit
  • Specific flow rate
  • Tapping capability
  • Temperature variation, fluctuation and stabilization
  • Nominal and specific water rate
  • Tapping performance

| European Standards

  • EN 13203-1
  • EN 13203-2
  • EN 13203-3
  • EN 625
  • ERP
  • Any standard requiring water inlet at constant temperature

Check Box for Electric Safety Tests unit (CB-EST)

The box

The CB-EST has been designed to check the functionality of the electric safety tests unit which is included in, or which works together with, some of the Microplan test benches. It is not a calibration unit; its function is to verify periodically if the electric safety machine is still operating properly.

The box mainly includes a set of electric resistances, whose value is selected according to the limits of current, voltage and resistance that the Electric Safety Test (EST) switchboard produces and measures. This test box needs to be connected to the same sockets in the test bench to which the boiler under test is usually connected. A specific test sequence, supplied with the box, has to be launched on the control PC of the bench. The user shall periodically perform this test to get the functionality of the EST tests under control. A daily check for every bench is advisable, but the customer can decide a different frequency.

The test sequence

The sequence supplied with the box is a test sequence like others, with some particular features; once launched the test sequence drives the electric safety tests unit to perform the tests and guides the operator in all the phases. The ground continuity, insulation and dielectric strength tests are performed, each one twice, as follows:

  • the first time the limits are set in the EST switchboard so that, considering the value of the resistances in the box, the test should end with a OK result. If this happens it means that the EST switchboard is correctly working therefore the sequence will continue with the following tests. If this is not the case, the test sequence will stop showing an error message.
  • the second time the limits in the EST switchboard are set in such a way that, considering the value of the resistances in the box, the test should end with a NOK result. If this happen it means that the switchboard is working well therefore the sequence will continue with the following tests. If this is not the case, the test sequence will stop showing an error message.

Serpico - constant pressure tank

| The problem 

If the water supply pressure in the customer's plant is not very stable, the regulation of the cooling water flow rate during efficiency tests can become very difficult, particularly in the part load tests with direct method, operating mode n. 1, where the cooling flow rate has to be very low in some cases.

| The solution

The constant pressure tank "SerPiCo" improves the testing procedure assuring a constant supply pressure for cooling water, compensating both pressure variations of the plant and differences in the flow rates demanded by the bench. Most of our customers found it very useful to keep the water inlet pressure stable not only for the secundary circuit during the efficiency tests, but also for the DHW circuit during sanitary tests. Therefore, as shown in the picture, the system includes an insulated tank to be used during tests on DHW that require inlet water at 10°C as per the standards; in this way power dispersion is avoided and humidity condensation on walls is highly reduced.

| The results 

As displayed in the graphs below, "SerPiCo" performs a better response than ordinary constant level water tanks during flow rate changes.  Moreover, it allows to reach an output supply pressure of 70% of the inlet pressure or more, so definitely higher than a constant level tank.

| Reaction to a sudden flow opening/closing:

Graph #1: Constant level tank (6m height, so only 0,6 bar pressure)

Traditional tank 


Graph #2:  "SerPiCo" Constant Pressure Tank (at 1.5 bar)

Serpico graph 


Nasagas - gas leakage detector

| What?

Nasagas is a very sensitive gas sniffer used to detect and locate gas leakages in piping, couplings, etc,. of gas fired appliances.

| How?

Through the aspirating gun the vapors are sucked and conveyed to the sensitive element which signal, duly conditioned, gives out the indication of the size of the leak detected.

| Where?

At final test of gas fired appliances.

| Who?

Manufacturers of gas fired appliances.

| Why?

  • Safe: no flame
  • Test time reduction
  • Elimination of false failure
  • Fast cleaning time (after detection)
  • Final results transmitted to PC of existing test stations
  • Quality improvement
  • Full traceability of test data
  • Test data available for statistical elaboration 


  • Turning it on
  • 3 seconds zeroing sucking air
  • Operator inspection of the possible leakages trough the use of the sucking gun
  • Whenever a leak is found 3 signals are transmitted:
    • Acoustic
    • Yellow led lighting
    • Increasing bar displayed
  • Leak result transmission to PC or PLC of the test bench.

| Technical specifications

Size  cm 30 x 30 x 12
Display LCD 128 x 64, 4 lines
Visible indicator two dual color LEDs
Sensitivity 55 cc/h (methane)
Range 0 - 3000 ppm (methane)
Response time 1 sec typical
Cleaning time 2 sec typical
Warm up time 3 sec
Power-on ready LED on red
Operating button Power on/off selector
Electric supply 24V
Pneumatic supply 2bar
Expected sensor life 1 year
Probe  Metal pipe with handle and 1.5 meters flexible pipe
Output (options) 0 - 10V or 4 - 20 mA
Conformity Atex compliant
Certification  CE 




Lambda system - real time combustion analysis

|The need

The gas valve regulation of condensing boilers at final test is made measuring the CO2 concentration in the fumes. The most common method is to suck up a fume sample from the chimney analysing it through infrared systems or through electrochemical cells. The answering time of these systems makes the regulation very long.

|The solution

Microplan experimented a system based on the use of a lambda probe similar to the ones used to control the combustion in motor vehicles. The measure of CO2 happens immediately. The system is completely electronic, it has not moving parts and it doesn't emit radiations of any type, so it is safe and strong.


  • Immediate: the lambda system has a typical answering time of 55 thousandths of a second.
  • Simple: the probe is small, light and it is simply fastened on the fumes pipe. Fumes suction and transportation systems are not required. Particular supporting or fastening frameworks are not needed. It is not necessary to modify the normal fumes path.
  • Low cost: compared to other fumes analysers the cost of a lambda system is very cheap.
  • Real: system like this are working on the production line of some Microplan's customers since the end of 2006.
  • Flexible: the device can work as a "stand alone" unit or it can be integrated in Microplan's test rigs.


Lambda system is a device to measure the values of CO2 in the exhausted fumes.


The lambda sensor, inserted in the chimney of the boiler or water heater under test, reads the value of Oxygen in the fumes and through a mathematic formula the value of CO2 is obtained. 


At the final test of boilers or water heaters, at the end of the production line.


  • Manufacturers of gas boilers
  • Manufacturers of gas water heaters






Where is the probe? 

in the chimney 

in the system 

in the system 

Is there a fumes aspiration system?




Where is the measure displayed?

meter display

monitor of a notebook or PC

monitor of the test bench

Which measure will be displayed? 

O2 wet

CO2 dry

CO2 dry

Where does the elaboration of the measures to calculate the values of CO2 d.a.f (dry air free) take place?no calculation of CO2in a program provided by Microplan to run on a support PCin the software of the test bench
Configuration of the systemlambda meter + probe + power supply (option)stand alone system featuring fumes aspiration, condensate drain, fumes temperature measurement system integrated in a Microplan test bench featuring fumes aspiration, condensate drain, fumes temperature measurement 
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