Güralp FORTIS User manual

FORTIS
QUICK-START GUIDE
STRONG MOTION ACCELEROMETER

Deployment Log
Date deployed Date recovered Location Comments
Serial number:

Fortis
Initial Hardware Setup
QUICK-START GUIDE
SENSOR CABLE
(optional)
Included in Fortis accessory pack
FIXING BOLT & NUT
(optional)
Setting the Gain
The Fortis has user-selectable gain that can be switched remotely
(via a Güralp Minimus digitiser) or locally via a rotary switch on the
base of the instrument. Remove the cover screw using a large, flat-
bladed screwdriver.
Rotary switch
Using a small, flat-
bladed screwdriver, turn the
switch to one of the four marked
positions, then reattach the cover
screw.
Engraved
switch position
Amplifier gain
Full-scale
(g)
3
1
4
2
2
2
1
4
1
0
8
0.5
FORTIS
MINIMUS
Power - 10 to 36 V DC
GNSS
(align red dots)
m m
ini
u
s

1
Remote gain control
3
2
4
To control the gain remotely, ensure that the switch
is set to position '3', as described in the previous
section.
Launch Discovery software. The serial number (as shown on
the base of the Minimus) should appear in the main window. If
the instrument does not appear, check your Ethernet
connection and press the Scan locally button.
To configure the
gain of the Fortis,
right-click on the
Minimus in
Discovery’s main
window and
select View Web
Page.
Click to the Setup
tab.
Make sure that
Sensor Type is set to
Fortis in the Analogue
Sensor section. You can
then change the gain
from the Sensor Gain
drop-down menu
(expressed in full scale).

Permanent Installation
Unpack the equipment onto a clean surface. Check that you
have all components and cables.
You will need a suitable digitiser / data-logger that can provide
a 10-36 V DC power supply, such as the Güralp Minimus.
Prepare a flat surface by scribing an accurate North-South line
and drilling a suitable bolt-hole. Place the accelerometer over
the fixing bolt and line up the orientation line with pointers on
the Fortis.
1
3
2
4
Level the sensor using its
adjustable feet until the bubble
level on the lid lies entirely within
the inner circle of the level
indicator. Secure the instrument
using a nut.
Do not over-tighten!
Connect a sensor cable
between the Fortis and the
digitiser, then power up the
digitiser. If you are using a
Minimus, you can now view
real-time waveforms from the
Fortis using Güralp Scream! or
Discovery software.

Temporary Installations
Next steps
For further assistance please contact our technical support team on
[email protected] or call us on [phone].
For detailed information on usage,
control & configuration of the Fortis,
Güralp highly recommends first
reading the Minimus Manual, MAN-
MIN-0001, available for download
from our web site at
http://www.guralp.com/documents/MAN-MIN-0001
followed by the Fortis Manual, MAN-FOR-0001:
http://www.guralp.com/documents/MAN-FOR-0001
It may also be important to update firmware on the Minimus - refer to
Section 5.16 of MAN-MIN-0001 for more details.
Caution: Although the Fortis is a strong motion instrument, it contains
sensitive mechanical components which can be damaged by
mishandling. If you are at all unsure about the handling or installation of
the device, you should contact Güralp Systems for assistance.
The Fortis is ideal for monitoring vibrations at field sites. Dig a
shallow pit, make a smooth base, level the sensor and then cover
with a box or bucket, bringing the cable out from under the
bottom. The pit can be covered and back-filled with soil, sand, or
polystyrene beads.

Notes

Güralp Systems Limited
Midas House
Calleva Park
Aldermaston
Reading
RG7 8EA
United Kingdom
T [phone]
F [phone]
E [email protected]
www.guralp.com
MSH-FOR-0001 Issue F
Notes