© Sensortech Systems, Inc. 2014 Page 2 of 15 Rev.5-2014
Introduction
The PMT-330 continues a long tradition of battery powered portable moisture testers manufactured by
Sensortech Systems, Inc. It incorporates many new features as well as a microprocessor and surface-
mount electronic components providing a compact, reliable product.
The PMT-330 is powered by a rechargeable NiMH battery pack for quick recharge and long service life.
Typical continuous operating time is 3 hours and the 3-minute time-out feature saves power and
significantly extends the length of the operating time by conserving the battery charge.
The operation of the PMT-330 will be familiar to PMT-220 users and the digital display and keyboard will
be simple to operate for new users.
There are two versions of portable moisture testers, the PMT-330V and the PMT-330G.
The PMT-330V is designed for veneer and thin sheet applications where the effective penetration depth is
approx. 1/8 inch (3mm). The contact moisture measurement does not damage the product being
measured. A measurement is made by pressing the Sensor Electrode onto the product surface. The
Sensor Electrode contains a flexible electrode in the center that adjusts to the contour of the product
surface and is made of hard anodized aluminum.
The PMT-330G is designed for gypsum and other board applications where the effective penetration
depth is approx. 3/4 inch (20mm). The contact moisture measurement does not damage the product
being measured. A measurement is made by pressing the Sensor Electrode onto the product surface.
The Sensor Electrode contains a fixed electrode in the center and is made of hard anodized aluminum.
A unique feature of the PMT-330G is that it is designed to work with the on-line IMPS-4400 moisture
profiling system. The Sensor Electrode and the RF electronic circuits are similar to that used by the IMPS-
4400 system sensors. The PMT-330 portable moisture tester can be calibrated to match the IMPS-4400
on-line system over a wide range of product moisture. The PMT-330 and IMPS-4400 system will follow
the same response curve and the RF penetration into a product being measured will be similar.
Figure 1. G - type Sensor Electrode V - type Sensor Electrode
Gypsum and Board Products Veneer & Thin Sheet Products
Penetration Depth ~3/4 inch (20mm) Penetration Depth ~1/8 inch (3mm)
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