Michell Instruments PC33, Руководство пользователя

Страница: 9 / 28

PC33 & 52 User’s Manual
Michell Instruments 3
CALIBRATION
3 CALIbRATIOn And AdjUSTMEnT PROCEdURE
• Calibration certifications : In addition to the normal calibration
procedure, each transmitter can be supplied with its own traceable
calibration certificate. Please ask Michell Instruments or your local
distributor for more information.
• Calibration interval time
: Under normal ambient conditions (0 to
50°C, 20 to 70% RH) and for accuracy of ±2% RH, an annual calibration
is recommended. For accuracy of ±5% RH a calibration is recommended
every five years. For environments with airborne chemicals or of high
humidity and high temperature conditions more frequent calibration is
recommended.
If re-adjustment is necessary, refer to Sections 3.1 and 3.2 and also see the drawings
of the circuit boards for the location of the potentiometers (
Figures 5 and 6) .
If a humidity generator is being used, an adjustment tube should be used to protect the
PCb and sensor (see Figure 4). For more information on these adjustment tubes please
contact Michell Instruments or your local distributor.
A humidity generator, (Michell Instruments S503, S904 or Optical), used in combination
with a general reference handheld hygrometer, is ideal for a quick and accurate
calibration. For more information on the S503, S904 or Optical humidity generators
please contact Michell Instruments (see contact details at www.michell.com).
Figure 3 Adjustment Tube