Vaisala Calibration of Digital Transmitters with HMI41 - Manual (Page 9)

Chapter 2 __________________________________________________________ Product Overview
VAISALA ________________________________________________________________________ 7
CHAPTER 2
PRODUCT OVERVIEW
This chapter introduces the features, advantages, and the product
nomenclature.
Introduction
HMI41 with Calibration Option
Vaisala HUMICAP
®
Humidity Indicator HMI41 can be used as a field
calibrator for various Vaisala humidity transmitters. There are four
different calibration cables available:
- 19116ZZ for the calibration of HMD/W60/70 and HMP140 series
analogue transmitters
- 19164ZZ for the calibration of HMP230 series digital
transmitters
- 19165ZZ for the calibration of the HMD/W20/30 and HMP130
series analogue transmitters
- 25917ZZ for the calibration of HMT100/HMT330 series digital
transmitters
Note that HMI41 has to meet the same requirements as the transmitter
to be calibrated. There are three calibration modes available: offset
(dry point), gain (wet point) and two-point calibration. All of these
can be performed using HMI41 either as a reference meter (for
example when the transmitter is mounted in an air-conditioning
channel) or only as a terminal for visualizing and setting the
transmitter's RH reading (for example when the transmitter does not
have a local keypad and it is calibrated against salt solutions without a
personal computer).