RADIOMETER TCM3 - Page 14

2. TCM3 TCM3 and TCM30 Service Manual
General Information, Continued
Patient Safety TCM3 is designed to comply with the IEC safety standards for medical equipment.
Any external device connected to the monitor, such as mains adapters, recorders,
computers etc., are galvanic isolated from the patient circuits.
The isolation is achieved by means of opto-couplers and a switching transformer. *
The “patient-side” of this barrier thus includes the Analog PCB, the Main PCB,
the Display PCB and the NiCd battery.
Each individual monitor is exposed to a final safety test before it leaves
RADIOMETER for shipment.
This safety test includes a patient barrier isolation test by a high voltage generator,
and a leakage current test.
The monitors are fitted with a comprehensive safety system to minimise the
probability of loosing electrode heat control.
e The electrode power consumption is continuously monitored. If it exceeds 600
mW for more than two minutes, the heating will be switched off and Error 5
will be displayed.
e Ifthe electrode temperature increases to more than 45.6 °C, the heating will be
switched off, and Error 10 is displayed. Further, the heat regulator will be
disabled.
e Ifa temperature difference of more than 0.6 °C is detected between the two
thermistors (combined electrodes E5277 and E5280) the heating will be
switched off and Error 11 is displayed.
e Ifa software error occurs, a monitoring circuit, the so-called “watchdog”
circuit, on the Main PCB will switch off the heating.
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