COND SGA-A & SGA-D Manuel_EN Rev3.doc
Page 15 on 20
Rev: 03/08/2006
6.
PRODUCT CARE
A worn out component, excessive use in harsh environments, an overly zealous operator; regrettably some
circumstances necessitate repair.
At SENSY s.a., we can't guarantee that a product will never require repairing.
We can, however, promise a repair service of exceptional quality, one which is governed by a rigorous
procedure.
Detailed below is our pledge to you: a defined set of ground rules and procedures to which we will adhere. All
we ask in return is that you assist us with our procedure, such that we can maintain our promise to you. Please
note that warranty repairs may not be available on overdue accounts, and that a strict interpretation of our
conditions of trading invalidates warranty claims where late payment has occurred.
Please refer to ‘Customer Repair Service Procedure’ document – contact your supplier for a copy.
In the unlikely event you have problems with the COND SGA module we would advise that you take the
following precautions:
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The unit is installed as instructed.
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Recommended spares are kept in stock. We can assist.
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Sufficient expertise available for first line maintenance.
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Routine maintenance checks are performed – annually is recommended.
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The necessary documentation for the product is available to the maintenance personnel.
We recommend you keep on file – as a minimum
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This Manual
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The settings of the switches and links on the COND SGA card
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The calibration figures for the attached sensors
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The instrument loop to which the output is connected
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A record of the ‘normal’ output – if applicable
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A maintenance record of the COND SGA
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A contact phone number from the supplier for assistance
7.
GLOSSARY
AWG
American Wire Gauge.
Background Noise
The total noise floor from all sources of interference in a measurement system,
independent of the presence of a data signal. (See noise)
Bipolar
The ability of a signal conditioner to display either positive or negative readings.
Bridge Resistance
The resistance measured across the excitation terminals of a strain gauge.
Calibration
The process of adjusting an instrument or compiling a deviation chart so that it’s
reading can be correlated to the actual value being measured.
CMR (Common-Mode
Rejection)
The ability of an instrument to eliminate the effect of AC or DC noise between signal
and ground. Normally expressed in dB at dc to 60 Hz. One type of CMR is specified
between SIG LO and PWR GND. In differential meters, a second type of CMR is
specified between SIG LO and ANA GND (METER GND).
Common Mode Rejection Ratio The ability of an instrument to reject interference from a common voltage at its input
terminals with relation to ground. Usually expressed in db (decibels).
Deadband / hysteresis
(Hysteresis) In a digital controller, there may be one switching point at which the
signal increases and another switching point at which the signal decreases. The
difference between the two switching points is hysterisis.
