The BK range of Drying Recorders have been used widely in the coatings industry throughout the world for several decades and have set the standard for reliability and quality.
As with all previous models the BK Variable is manufactured from good quality materials including brass, aluminium casings and stainless-steel fittings, the product is fully serviceable to ensure longevity and all spare parts are available. A needle carrier of high-quality design and manufacture can be seen in the photograph above holding six hemispherical ended needles which travel the length of the six 305 x 25mm test strips in a choice of 20 pre-programmed times from 7.5 minutes to 96 hours. Other specific times can be specified in increments of 30s at the time of order.
|Supply Rating:||Input AC100-240 Volts 50-60Hz 1.8 Amp|
|Power Supply Output:||DC 24v 4Amp|
|Fuse:||mains plug 13 Amp|
|Operating Conditions:||Indoor use|
|Altitude:||up to 2000 metres|
|Ambient Temperature:||5°C to 40°C|
|Max RH:||80% up to 31°C increasing linearly to 50% RH at 40 deg C|
|Standard Times:||7.5 mins, 15 mins, 30 mins, 1 Hour, 1.5 Hours, 2 hours, 3 hours, 4 hours, 6 hours, 9 hours, 12 hours, 15 hours, 18 hours, 24 hours, 30 hours, 36 hours, 48 hours, 60 hours, 80 hours, 96 hours (To program specific/special times will cost an additional $150 and will increase delivery time)|
|Pollution Degree:||1 or 2 (IEC 664)|
|Dimensions (cms):||47 x 22 x 12|
The Applicator - is a 25 mm stainless steel cube with a hole drilled centrally from one face through to the opposite face. From each end of this hole a gap 12 mm wide is ground from the hole to one side of the applicator, thus providing 2 gaps per applicator. The applicator is placed at one end of the glass strip with the ground gap facing the end. Paint is poured into the hole and the applicator steadily drawn down the glass strip and off the other end, the gap being the trailing end of the applicator. Paint will flow through the gap depositing a 12 mm wide film on the glass strip.
The standard applicator has a gap depth of 75 microns (3 mils) one end and 150 microns (6 mils) the other, which will apply a paint film thickness of approximately half the gap size. Any gap depth between 10 and 650 microns can be supplied to suit customer requirements.
The Casterguide - is a device for simplifying and “tidying-up” the process of applying the paint film to the glass strip. It consists of a cast aluminum trough with a ledge on each side to carry the glass strip and a step one end to allow the user to hold the strip in place. The applicator is then posotioned on the glass stirp at the step end and filled with paint as described above. When using the applicator the casterguide ensures that the film is applied centrally and, as the applicator is drawn off the end of the glass strip, the surplus paint is collected in the trough underneath.
This operation may be repeated several times before cleaning is necessary. For this purpose use only suitable solvents, do not use caustic alkali or caustic detergents since these will attack the aluminum metal.
Before operation the equipment will need to be unpacked and set up as follows: Unpack and place the dryer and associated parts onto a clean stable worktop. The power supply is to be assembled by plugging in the output pin into the rear socket on the recorder. Route the cable behind the equipment and when satisfied that the area is safely and tidily positioned, plug into the mains socket and switch on the mains power. The screen should display a time setting. Use the recorder on a firm bench and do not restrict ventilation by using in a confined area. Any surplus paint should be wiped off the recorder with a dry cloth. We do not recommend the use of solvents. If an object is accidently dropped into the recorder, immediately disconnect from the main power supply and retrieve the object. If the equipment has been dropped or damaged in any way, it should be checked before connecting to the supply. Similarly, although the equipment is lubricated for life, any work (especially involving the removal of covers) must be carried out by a competent engineer. In the interests of safety, always use the equipment in the specified manner.
Interpretation of Results - The recorders define stages in the drying process as:
Stage 1 - A pear shaped impression corresponding to the time taken for evaporation of solvent.
Stage 2 - The cutting of a continuous track, corresponding to a sol-gel transition.
Stage 3 - An interrupted track corresponding to the surface dry time.
Stage 4 - The needle no longer penetrates the film, corresponding to the final drying time.
BKV Drying Recorder comes with 6 Glass Strips, 6 Standard Needles, and 6 five gram weights