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MR850 Technical Manual * Revision J * Issued November 2005 * Ref. 185041340 (185041713 internal)
55
11 Calibration Probe
The information presented here refers to the construction of the MR850 Calibration Probe. This
information is provided so that the probe can be checked for correct operation if required.
The calibration probe consists of two Redel plugs, each containing four 0.1 % tolerance
resistors. In order to measure the absolute accuracy of these resistors; it is recommended that
an ohm meter with better than ± 0.2 % accuracy is used.
To measure the value of the resistors used in the probes, unscrew the cable collet holding the
plug together in order to gain access to the connector pins.
Blue collet
Grey collet
Chamber temperature = 75.0 °C Chamber temperature = 55.2 °C
Airway temperature = 42.8 °C Airway temperature = 40.5 °C
The measured values must be accurate to +
0.3 % of their nominal value when using a meter
accurate to ± 0.2 %.
Contact a Fisher & Paykel Healthcare representative if an independent calibration probe check
is required.