The ViscoCIock plus is an electronic timing unit for glass capillary viscometers used to determine kinematic and relative viscosity. Succeeding the well-proven ViscoCIock, the new instrument features data storage and simpler handling. The ViscoClock plus is especially designed for Ubbelohde type viscometers which are well-known for highest precision.
Automatic measurement of flow times
The ViscoCIock plus is designed for SI Analytics® Ubbelohde, Micro Ubbelohde and Micro Ostwald viscometers. The flow time is measured automatically by two infrared light barriers which detect the passing liquid meniscus. The repeatability of the automatic time measurement is considerably higher in comparison to the measurement using a stop watch. Therefore some viscometry standards allow a flow time reduction in case of automatic fl ow time measurement.
Properties and materials
The ViscoCIock plus can be used for measuring temperatures ranging from -40 °C to 150 °C. The stand of the ViscoClock plus ist made of high quality polymer PPA. For temperature stabilization in a thermostatic bath, the following liquids are suitable: Water, alcohol, glycol, paraffin oil, and silicon oil. The electronic measuring unit is built-in to a PP casing.
The ventilation of Ubbelohde viscometers is managed by an electromechanic valve which makes handling easier in comparison to the mechanical mechanism of the previous ViscoClock.
The measuring results of the ViscoClock plus can be stored on a USB fl ash drive including date, time and sample/viscometer ID. The data are stored as pdf (non-editable) and csv (editable). Alternatively, for data transfer the ViscoClock plus can be connected to a printer (TZ 3863) or a PC.
Sample and viscometer identification
To allocate the stored measuring results, the user can enter 2-digit numbers to the ViscoClock plus before measurement. These IDs – together with date and time – ensure an unambiguous assignment of the flow times.
To determine absolute kinematic viscosities, calibrated viscometers have to be used. To guarantee best accuracy, viscometers which were calibrated by automatic measurement should be used. The constant of automatic calibration can be slightly different in comparison to manual calibration, as the level of the light barriers may not be identical to the position of timing marks.
For determination of relative viscosities, calibrated as well as non-calibrated viscometers can be used.
For evaluation, the calibration constant is not required in this case.
|Measuring range - Time||up to 999.99 s; resolution 0.01 s|
|Accuracy of time
|± 0.01 s / ± 1 digit; however no more precise than 0.1 %;|
|indicated as measuring uncertainty with a confi dence level of 95 %|
|Measuring range -
|0.35 to10,000 mm²/s (cSt)|
|the absolute, kinematic viscosity is additionally dependent on the uncertainty of the
numerical value of the viscometer constant and on the measuring conditions, in particular
the measuring temperature.
|Display||LCD grafi c display (FSTN) 128x64 pixel, 51x31mm (w x h)|
|seconds indication with 2 decimal digits after the decimal point, resolution 0.01 s|
|Voltage supply||DC + 9 V|
|Power supply||socket for low voltage connection: coaxial power connector, inner diameter 2.1 mm, plus
pole at inner contact
|for connection of Universal power supply TZ 1858|
|Power supply||in accordance to class of protection III|
|degree of protection for dust and humidity IP 50 in accordance with DIN 40 050|
|Universal power supply TZ 1858: 100 – 240 V, 50 – 60 Hz (9 V, 550 mA)|
|not suitable for use in areas subject to explosion hazards|
|Plug Connections||USB Host to connect USB fl ash drive or printer (TZ 3863)|
|USB OTG to connect (PC), printer (TZ 3863) or USB fl ash drive|
|Type A USB connector|
|Type B mini USB connector|
|Ambient Conditions||Ambient temperature + 10 to + 40 °C for storage and transport|
|Operating temperature stand: – 40 to + 150 °C|
|Operating temperature: electronic measuring unit: +10 to +40 °C|
|Humidity: in accordance with EN 61 010, Part 1;|
|Humidity: max. relative humidity 80 % for temperatures up to 31 °C,|
|Humidity: decreasing linearly to 50 % of relative humidity at a temperature
of 40 °C
|Viscometer types||Ubbelohde (DIN; ISO; ASTM; Micro), Micro-Ostwald, manufactured by SI Analytics®|