HOTLINE
®
Blood and Fluid Warmer Technical Service Pack
67
SECTION 5
HL-90 Service Test Specification
[i] If necessary, turn the “H2O” or “40” temperature set point
adjustment pot clockwise to increase recirculating solution
temperature, or counter-clockwise to decrease recirculating
solution temperature. A quarter turn of the pot corresponds
to a change in temperature of about 0.3°C. Allow 5 minutes
between adjustments for the temperature to stabilise .
[ii] Set unit to run at 41.9°C ± 0.1°C as measured by the TEMP
CHECK and allow to stabilise.
Set Over Temperature Alarm Set Point
[i] Adjust the “LCD” adjustment pot so the LCD reads 43.1°C. If
the alarm activates before the display reaches 43.1, then
adjust the over temperature pot clockwise until the alarm
turns off and continue adjusting LCD.
[ii] Adjust the over temperature pot counter-clockwise until the
alarm sounds.
[iii] Adjust the “LCD” adjustment pot counter-clockwise and
confirm that the alarm deactivates.
[iv] Adjust the “LCD” adjustment pot clockwise again and
confirm that the alarm activates at 43.1°C.
[v] Repeat the test twice to confirm the activation set point.
Calibrate LCD
[i] Turn the “LCD” adjustment pot on the PCB so that the unit
display (LCD) is equal to the that of the Temp Check ± 0.0°C.
[ii] To confirm the Over Temperature Alarm, depress and hold
the over temperature switch on the side of the enclosure.
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