Chapter 2. The Validator AVS Hardware
Kaye Validator AVS User’s Manual 22
2.3 Sensor Input Modules
The Validator AVS plug-in Sensor Input Modules (SIMs) help reduce the time it takes to
perform validation studies. Each SIM has:
• 12 sensor input connections, 6 for RTD SIMs
• A memory chip to store calibration offsets, SIM serial number, slot location, and the
serial number of the Validator AVS measurement board where calibration was
performed
• A cold junction reference RTD to help maintain measurement accuracy through
changing environmental conditions
Each TC SIM accepts T, J, B, S, R, N and K type thermocouples as well as inputs up to
10 VDC. Using 4 SIMs, you can attach up to 48 inputs in any combination of
thermocouples, contact or voltage inputs. For 4 to 10mA current inputs a separate SIM is
available.
SIMs are designed to be wired once and used repeatedly. You can wire SIMs yourself, or
buy pre-wired SIMs to further reduce preparation time. Once the SIMs are wired, you
can calibrate multiple harnesses at the same time and store them for later use, saving you
valuable preparation time. Since calibration of thermocouples requires compensation for
errors measured in fractions of microvolts, making these offsets specific to this
instrument and SIM location, it is recommended that you use the supplied erasable labels
to record:
• SIM serial number
• SIM slot number
• Serial number of the Validator AVS where the sensors were calibrated and the date
they were calibrated
When you want to use these SIMs, just pull them off the shelf and plug them in. The
calibration offsets are stored in the SIM's internal memory. To prevent you from using
the wrong instrument or SIM slot, the system will alert you during the qualification run
that the SIM is plugged into the wrong instrument or the wrong SIM slot. The SIMs are
made of high impact materials that will withstand 5000 insertions, and are designed with
a tilt and a drain hole to minimize the effects of condensation.
IMPORTANT: SIMs are recognized by the system when you power up the Validator
AVS. Make sure all SIMs are connected prior to powering up the
Validator AVS, or you will have to power down, insert your SIMs, and
power up again. If a SIM is disconnected after power up, calibrated
offsets or SIM data might not be read correctly. To rectify this, power
down, reconnect the SIM, and power back up.
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