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BK Variable Drying Recorder

Article No. 14331

BKV Variable Drying Recorder

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.

$2,599.00 excl. taxes & shipping cost


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.

Technical Attributes

  • Data
    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)
    Installation:Category II
    Pollution Degree:1 or 2 (IEC 664)
    Dimensions (cms):47 x 22 x 12
    Weight (Kg):3.3

More Information


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.


DIN EN 14022, ISO 9117-4, and ASTM D5895


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.

  1. With the recorder disconnected, place the glass test strips in their holders on the top of the recorder and clamp a needle into each needle holder making sure that the needle arm is horizontal when the needle end is resting on the glass strip. If it is necessary to move the needle carrier in order to bring the needle directly over the glass strip, first remove the brass weights and rotate the needle carrier rearwards, lift the release lever on the side of the needle carrier and slide the carrier to the required position. 
  2. Slide the needle carrier to the start position at the Zero end of the time scale by lifting the side lever to disengage drive and slide carrier assembly.
  3.  The required travel time is obtained by using the up or down buttons on the front panel.
  4. Remove the glass strips and apply a paint film to them (our applicator cube and casterguide are recommended for this) and replace them on the recorder.
  5. Lower the needles onto the test strips and press the "RUN/STOP" button. The needles will now commence their run along the glass strips and automatically stop at the end of their travel. The run can be stopped at any time by re pressing the "RUN/STOP" button
  6. To view the results on the glass strips, look down onto the top surface of the dryer and press and hold the "INSPECT" button. The device will illuminate the strips for clarification of the distance travelled
  7. Brass weights, each weighing 5 grams, may be used to apply greater pressure on the needles and thus record the through-drying properties of alkyds, varnishes and paints. The BK Drying Recorders will give useful information about the gelation times of many two component surface coating materials, and about properties of such films.
  8. 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.

Delivery Content

BKV Drying Recorder comes with 6 Glass Strips, 6 Standard Needles, and 6 five gram weights

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