Guralp Systems Limited
Fortis - Technical Manual

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1. Preliminary Notes 2. Introduction 3. Getting started 4. Installation 5. Accessories 6. Calibration 7. Connector pin-outs 8. Revision History

Section Index: 4.1. Permanent installations 4.2. Temporary installations 4.3. Installation in Hazardous environments

Chapter 4. Installation

4.1 Permanent installations

You will need a hard, clean surface such as a concrete floor, to install the Fortis.

If you are in any doubt about how to install the sensor, you should contact Güralp Systems' Technical Support, via support@guralp.com.

The instrument is now installed and transducing ground motion.

4.2 Temporary installations

The Fortis is ideal for monitoring vibrations at field sites, owing to its ruggedness, high sensitivity and ease of deployment. Temporary installations will usually be in hand-dug pits or machine-augered holes. Once a level base is made, the accelerometer can be sited there and covered with a box or bucket. One way to produce a level base is to use a hard-setting liquid:

If you prefer, you can use quicker-setting plaster or polyester mixtures to provide a mounting surface. However, you must take care to prevent the liquid leaking away by “proofing” the hole beforehand. Dental plaster, or similar mixtures, may need reinforcing with sacking or muslin.

4.3 Installation in Hazardous environments

The fully enclosed, aluminium case design of the Fortis makes it suitable for use in hazardous environments where electrical discharges due to the build up of static charge could lead to the ignition of flammable gasses. To ensure safe operation in these conditions, the metal case of the instrument must be electrically bonded ('earthed') to the structure on which it is mounted, forming a path to safely discharge any static charge.

Where electrical bonding ('earthing') is required during the installation of a Fortis, the central mounting hole that extends through the instrument should be used as the connection point. This is electrically connected to all other parts of the sensor case. Connection can be made by either a cable from a local earthing point terminated in a 8mm ring tag or via the mounting bolt itself.

PreviousNext

1. Preliminary Notes 2. Introduction 3. Getting started 4. Installation 5. Accessories 6. Calibration 7. Connector pin-outs 8. Revision History