Kaye LTR -90 Operating Manual 19
Chapter 5. General Operation
Chapter 5. General Operation
5.1 Calibrator Setup
Place the calibrator on a flat surface with at least 6 inches of free space around the instrument. DO NOT place under a
flammable structure or cabinet. Plug the power cord into a grounded mains outlet. Observe that the nominal voltage
corresponds to that indicated on the calibrator.
Gently insert the thermocouple probe sleeves into the well. The well must be clear of any foreign objects, dirt, and grit
before the sleeve is inserted. The sleeve is inserted with the two small tong holes positioned upward.
5.2 Calibrating Sensors
Sensor calibration is performed prior to carrying out a validation test to correct raw temperature readings to a traceable
temperature measurement standard. Due to the LTR-90's range of temperature and rapid heating and cooling
capabilities, the instrument can be used to provide calibrations for a variety of validation processes. To provide
maximum accuracy, a two-point calibration should be performed close to the operating temperature of the process.
The Kaye Validator automatically downloads the calibration set-points defined in your setup to the LTR-90 and
controls the entire sensor calibration procedure.
Before you begin the calibration process:
Place the Validator in a location with stable and even temperature, not exposed to any local heat sources (i.e., close to a
sterilizer, an open door causing a draft, etc.)
Connect the serial connector end of the Temp Reference Communication Interface cable to the front of the LTR-90 and
the other end, to the back of the Validator unit.
To provide maximum accuracy during the calibration process, power up the Validator and let it run for approximately
30 minutes in the operating environment where calibration is to be performed in order for the Validator to acclimate to
the ambient temperature.
Since transient environmental temperature will cause thermal measurements to change, Kaye specifies that the
Validator system be allowed to stabilize for at least 30 minutes for every 10°C change in temperature. For example, if
you move the Validator from a 25°C environment to a 40°C degree environment, it should be allowed to run for 45
minutes before use.
Place the thermocouples and IRTD into the LTR-90, making them pass through the rubber inserts first and then into the
well (Figure 8 on page 23), making sure to use the well inserts for the thermocouples. The LTR-90 provides the stable
temperature required for sensor calibration. The IRTD, a self-contained precision measurement standard that provides
data directly to the Validator, accurately measures the temperature of the LTR-90. The IRTD provides a traceable
standard that is used to correct the temperature readings of your thermocouples.
The rubber plugs should be placed in the hole after the thermocouples have been placed as desired. Once the rubber
plug is inserted it will push the thermocouples to the three grooves along the outer rim of the hole, securing the
thermocouples in these grooves. (Figure 9 on page 23).
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