Preparations before the calibration, Relative humidity calibration and adjustment, In two points) – Vaisala MMT310 User Manual
Page 56: Figure 15, Location of adjustment button
User's Guide _______________________________________________________________________
56 ___________________________________________________________________ M210474EN-C
Preparations Before the Calibration
Before calibration, clean the used sensor with instrument air to blow out
existing oil, or gently first flush with heptane (C7H16) and dry with
instrument air to decrease response time.
NOTE
It is important to clean the sensor before calibration as a dirty sensor can
contaminate the salt bath and change the reference condition.
Relative Humidity Calibration and Adjustment (in
Two Points)
Relative humidity calibration and adjustment of the MMT318 and
MMT317 is done by using two reference humidities (low end and high
end). The difference between the two humidity references must be at
least 50% RH.
An easy calibration can be done by using Vaisala Humidity Calibrator
HMK15. When using the HMK15 calibrator, use the adapter fitting (13.5
mm) with the MMT318 and MMT317 probe.
Before calibration the transmitter must be set to adjustment mode by
pressing the adjustment button (see Figure 15 below).
0507-048
Figure 15
Location of Adjustment Button