ABEM Terrameter SAS 1000 / SAS 4000
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7
TERRAMETER SAS LOG 300
This section describes the operation of the Terrameter SAS 1000 / 4000 accessories
Terrameter SAS LOG 300. All instructions apply for both versions of SAS LOG.
7.1
CONTROLS, TERMINALS AND LOGGING CABLE
N.B. during logging operation there should be no connections to C1-C2 and P1-P2 terminals
on SAS 1000 / 4000.
The SAS LOG 300 consists of a 300 m long logging cable with a logging probe and a
convenient backpacking frame. On the frame is an electronic unit mounted as well as
terminals for the Current Return / Potential Reference and a connector for connecting to the
SAS 1000 / 4000.
The logging cable has seven nylon-insulated conductors and a polyurethane jacket. A Kevlar
stress member, good for 4000N is incorporated. Three cylindrical current takeouts are located
5.6 m, 1.2 m and 0.4 m upwards from the probe shoulder. The cable is marked at 1 m
intervals, starting at the logging probe shoulder.
The stainless steel upper end (shoulder) of the logging probe, serves as electrode 0 m. The
lower inside end of the probe - the chamber - has one ring electrode, -0.4 m and one electrode
in the centre, the chamber electrode. The centre electrode also contains the temperature
transducer. The end of the chamber is set at an angle to improve circulation of fluid in the
chamber as the probe moves. Three holes in the chamber wall permit air to escape, thus
ensuring good contact with the fluid.
A control cable, 33 0020 11, connects the SAS LOG 300 to SAS 1000 / 4000. The SAS LOG
is fully governed from the SAS 1000 / 4000.
The return current terminal is connected to a return current electrode (ABEM stainless steel
electrode) placed not less than 75 m from the well to be surveyed.
The potential reference terminal is connected to a reference potential electrode (ABEM
stainless steel electrode) not less than 50 m from the well and in the opposite position from
the return current electrode.
Even if there is a test facility testing the ground connection for these remote electrodes, great
care should be exercised when installing them to ensure reliable connection to ground.
Directly after switch on, the LOG will perform a self-check, which takes a few seconds.
The SAS LOG 300 facilitates following functional modes:
•
Down (automatic measurements according to settings made in point 4 chapter 7.2,
manually activated)
•
Up (automatic measurements according to settings made in point 4 chapter 7.2, manually
activated)
•
Electrode Check
•
Level Check (Water-)
•
Depolarise
•
Temperature
•
SP Voltage
•
Short Normal (Resistivity)
