Viscolite VL7
10 U01-04-013 R1 08/13
2 Measuring viscosity
Figure 4
Display unit
2.1 Turning on
• Press the *key on the display unit and
hold it down for a second or two.
• The display shows a succession of digits
while the microprocessor goes through a
start-up routine. It will then show “VL”
briefly before settling on the “live viscosity”
reading. This is the dynamic viscosity
in centipoise (cP) of whatever fluid is
surrounding the sensor.
• The reading is updated every 1.5 seconds
approximately.
• Pressing the )or (keys will bring up two
other measurements, “t” (temperature) and
“VC” (temperature-corrected viscosity). For
more details, see pages 12 and 13.
• A beeper sounds each time a key is pressed.
• To switch off, press the *key again.
2.2 Operation check
• The display unit should read 0.0(zero) so long as the sensor is
(i) perfectly clean, dry and
(ii) wholly in air and not touching anything.
• The display should show 1.0 (exactly one) if the sensor is immersed in water at 20 °C.
For details of the checking procedure, see Section 5.2.
• If the air reading is not exactly zero:
(1) check that the sensor is perfectly clean, dry and not in contact with anything.
(2) if necessary, perform a “minor null adjustment” as described in Section 4.4 (p. 22).
