K-Patents PR-01-S - Manual (Page 42)

INSTRUCTION MANUAL FOR K-PATENTS PR-01-S (-AX/FM/CS) DOCUMENT/REVISION No. INM 1/14
Effective: May 15, 2009
40
Sensor exchange:
To substitute a Sensor by a spare Sensor calibrated for the same range, keeping the Indicating transmitter,
the ten constants in the "sensor adaption" zone (Figure 5.70) have to be entered according to the constants
of the spare sensor, see the DELIVERY DATA SHEET. If the Sensor is calibrated for another range (or
process medium), the Bias, Gain, Square and Cube have to be determined by Field Calibration (Section
5.3).
The calibration constants:
– Concentration linearization: Bias, Gain, Square, Cube. Normally a 6 character number (incl. . and -).
Enter from Calibration/Parameters/CONC/Parameters.
– Temperature compensation: TNM, Temp coeff, Temp TC adj, Conc TC adj, Square Temp CO. If
Temp coeff = 0 and TC adj = 0, then there is no temperature compensation. Enter via
Calibration/Parameters/CONC/Parameters.
– Linearization of Standard RI (25°C): RI-Bias/Gain/Square/Cube. The values are specific for each
sensor. Enter from Calibration/Parameters/Standard RI.
– Temperature adjustments: TMPC0, TMPC1 are factory adjusted and specific for each sensor. For
Tbias, see Section 5.8. Enter from Calibration/Parameters/Temperature.
5.8. TEMPERATURE CALIBRATION
Normally the process liquid temperature is considerably higher than the ambient. Then the heat loss
through the Sensor may cause the temperature display to be about 5 °C (9 °F) lower than the process
temperature. This will not impair the measurement, and the difference can be ignored.
If, however, the temperature has to show an absolute correct value, then a bias in °C can be added to the
temperature reading, "Temperature bias".
Note: A change of Temperature bias will cause a small change in the concentration output, due to the
temperature compensation.
5.9. INSTRUMENT VERIFICATION
The company, which maintains a quality system according to ISO 9000 quality standard must have defined
procedures for controlling and calibrating its measuring equipment. This is required for demonstrating the
conformance of the final end product to the specified requirements.
The company should:
-
identify the required accuracy and select an appropriate equipment for the measurements
- establish calibration procedures, including check method and acceptance criteria.
- calibrate the equipment at prescribed intervals against certified equipment having a known valid
relationship to nationally recognized standards. When no such standard exists, the basis used for
calibration should be documented.
This Section 5.9 provides the K-Patents process refractometer user a valid method for meeting the above
requirements. K-Patents quality system is certified against the ISO 9001 by Det Norske Veritas. K-Patents
verifies the calibration of all delivered instruments according to a similar procedure as described in this
section.