To perform a multi-point adjustment (3 … 5 adjustment points) to the RH measurement of the HMP110 or HMP113 probe with Insight PC software you need:
- Vaisala USB cable (item code 219690)
- Computer with a Microsoft Windows® operating system (64-bit version and Vaisala Insight PC software installed. Insight PC software can be downloaded at www.vaisala.com/insight.
- 3 … 5 humidity references. For reference examples for a 5-point adjustment, see Table 1.
For more information on using a humidity calibrator and salt chamber references, see Vaisala Humidity Calibrator HMK15 User Guide M210185EN. |
A 2-point adjustment (close to the low and high ends of the used RH range) is enough to reach the specified accuracy over the whole range. However, if your standards or operating procedures explicitly require 3...5 adjustment points, perform a multipoint adjustment (3 … 5 points) with Insight PC software. |
Salt chamber solution | RH at 25 °C |
---|---|
LiCl | 11.3 %RH 1 |
MgCl | 32.8 %RH 1 |
NaCl | 75.3 %RH 1 |
KCl | 84.3 %RH 1 |
K2SO4 | 97.3 %RH 1 |
The following 5-point adjustment example procedure uses the Vaisala HMK15 Humidity Calibrator. LiCl salt (11.3 %RH) is used as the first reference point, and following 4 references are as shown in Table 1.
1 See Greenspan's
calibration table in Vaisala Humidity Calibrator HMK15 User Guide M210185EN
for salt reference humidity uncertainties in different temperatures.