Specifications

55
HMM 22D and HMM 30C Relative Humidity
Modules for Custom Applications
SMALL, EASY-TO INSTALL PRODUCTS
FEATURE RUGGED SENSOR
Vaisala has developed several different products for
OEM applications. Two of these products, the HMM
22D and HMM 30C, were developed for installation
into environmental control chambers and are excel-
lent examples of how Vaisala can meet the specific
requirements of our customers.
Both the HMM 30C and the HMM 22D are small and
easy to install directly onto the wall of a chamber or
other device. The HMM 30C was designed for high
temperature, high performance environmental
chambers, such as those used for accelerated aging
tests, or for 85°C/85% RH testing. The probe is
separated from the circuit board, allowing the
electronics to be housed along with other sensor and
controller boards. The HMM 22D module provides a
4 to 20 mA output and operates over a temperature
range of -40 to +176 °F (-40 to +80 °C). It uses a
small sensing head, separated from the circuit board
via a cable. Both of these products use the HUMI-
CAP
®
sensor to measure relative humidity from 0 to
100%, and can be maintained using Vaisalas on-site
electronic calibration method.
EXPERIENCED R&D DEPARTMENT
DEVELOPS NEW PRODUCTS
FOR SPECIFIC APPLICATIONS
Vaisala has a large R&D staff devoted to improving
humidity sensing technology and to developing new
products. Twenty five years ago this group invented
and patented the first thin film capacitive humidity
sensor and this team continues to be the industry
leader. The expertise residing in this group makes it
possible for Vaisala to develop products that will
meet the specific requirements of OEM (Original
Equipment Manufacturers) customers. Vaisala Inc.
also has a knowledgeable technical sales force who
provide the interface between our OEM customers
and our R&D engineers. This capability is particularly
useful when a customer is designing or manufactur-
ing a product with rigid mechanical or electronic
requirements.
The HMM 22D and HMM 30C are just two examples
of the diverse products that have been designed to
meet specific customer requirements. Contact Vaisala
for new ideas on how to incorporate humidity
monitoring into your product.
HMM 22D
HMM 22D
For use in environmental chambers
HMM 30C
For high temperature environmental chambers
HMM 30C