Extech RH300-CAL Manual

Extech Måling RH300-CAL

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Information Sheet

Relative Humidity Calibration Reference Standards

RH300-CAL for use with Extech RH300 Humidity Meter

Introduction

Congratulations on your purchase of the Extech Relative Humidity Calibration Standards. Two bottles are included, one for the 75% Relative

Humidity reference and one for the 33% Relative Humidity reference. The 75% Relative Humidity reference uses Sodium Chloride (NaCl) to

produce the standard. The 33% Relative Humidity reference uses Magnesium Chloride (MgCl). Instructions for calibrating Extech Instruments

Humidity Meters, using these reference standards, are supplied with the Humidity Meter.

Temperature Compensation

These standards provide a Relative Humidity reference at room temperature (68

F and 20

C). If the reference is allowed to deviate from room

temperature, the Relative Humidity provided by the standard will be lower or higher, depending on the temperature.

33%

Reference Standard

Temperature

F (15

C) 68

F (20

C) 77

F (25

C) 86

F (30

C) 95

F (35

Relative Hu

midity

33.30% 33.07% 32.78% 32.44% 32.05%

75% Reference Standard

Temperature

F (15

C) 68

F (20

C) 77

F (25

C) 86

F (30

C) 95

F (35

Relative Humidity

75.61% 75.47% 75.29% 75.09% 74.87%

Care and Use

The reference bottles should be kept closed and tightly sealed when not in use. If the contents of the bottles are left to dry and harden, the bottles

must be immediately replaced.