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Sentinel Performance Solutions Ltd, The Heath Business & Technical Park 
Runcorn, Cheshire, WA7 4QX T: +44 (0) 1928 588330

 F: +44 (0) 01928 588368 

 

 

 

 

 

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june-10

 

Technical Information 

* Frost Protection 

Please note that the frost protection figure quoted 
in the Test Kit instructions refers to a ‘burst 
protection’ at which propylene glycol 
concentration is sufficient to prevent bursting of 
pipework but not necessarily high enough to 
maintain the fluid in a pumpable state. This figure 
is the ‘Setting Point’ as measured using the DIN 
51583 method. The ‘Setting Point’ is the 
temperature at which the fluid solidifies.  

The temperature figure read from the 
refractometer corresponding to the percentage 
glycol figure is the onset of the freezing point as 
measured using the ASTM D1177 method. For a 
propylene glycol/water mixture, at temperatures 
between its ‘Freezing Point’ and its ‘Setting 
Point’, the mixture becomes progressively more 
difficult to pump. A comparison chart of ‘Freezing 
Point’ and ‘Setting Point’ for propylene 
glycol/water mixtures is shown below. 

 

% Propylene Glycol (v/v) 

10 

15 

20 

25 

30 

35 

40 

45 

50 

Freezing Point (

°

C) 

-2 

-4 

-6 

-8 

-11 

-13 

-17 

-21 

-27 

-34 

Setting Point (

°

C) 

-2 

-5 

-8 

-10 

-14 

-17 

-22 

-28 

-37 

-50 

 

 

 

 

 

 

 

Summary of Contents for SolarCheck

Page 1: ...tlet thermal fluid pipework as it enters and leaves the hot water storage tank and again record on the SolarCheck Survey Sheet 3 Using the radiator key take a sample of the thermal fluid from a suitable drain valve on the system Discard the first bottleful and refill the bottle Take appropriate care to avoid burns by using heat resistant gloves if it is appropriate to do so 4 Record the appearance...

Page 2: ... such that they are facing in a southerly direction or as close to it as possible Instructions for use of Infrared Thermometer Operation 1 Point the unit at the surface to be measured You must ensure that the detection area you want to measure is larger than the light spot size to get a correct reading The light spot is used for aiming at the target 2 Press the button and the temperature reading w...

Page 3: ...re that the sample is cooled to ambient temperature and repeat steps 1 3 above Take the reading at the point where the blue and white boundary occurs on the propylene glycol scale This will represent the antifreeze content of the thermal fluid Warning Maintenance 1 Do not expose the instrument to damp working conditions and do not immerse the instrument in water If the instrument becomes foggy wat...

Page 4: ...Point as measured using the DIN 51583 method The Setting Point is the temperature at which the fluid solidifies The temperature figure read from the refractometer corresponding to the percentage glycol figure is the onset of the freezing point as measured using the ASTM D1177 method For a propylene glycol water mixture at temperatures between its Freezing Point and its Setting Point the mixture be...

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