Kendro HERAcell 150, Operating Instructions Manual

Page: 53 / 251

CO
2
Incubator HERAcell ® 150 Operating Instructions
53
6. Handling and control
6.13 Gas guard failure display
When the pressure in one of the two gas cylinders drops below the limit value of
0.6 bar for more than two minutes, the gas guard switches the gas supply over to
the other cylinder (filling pressure > 0.6 bar).
The response time of two minutes prevents the gas minitor from switching over
upon momentary pressure fluctuations (e.g. when opening device doors).
The failure appears alternatingly as „actual value“ and „error message“ (see be-
low) on the display of the detected process gas.
If the filling pressure is below the limit value in both cylinders, the audible alarm
is triggered, the potential-free contact is activated, and a visual alarm (flashing
failure code) appears on the display of the detected process gas.
Error messages (Example: CO
2
supply):
Pressure drop in gas cylinder A (pressure < 0.6 bar)
and
Pressure drop in gas cylinder B (pressure < 0.6 bar)
and
Pressure drop in both monitored gas cylinders A and B (pressure < 0.6 bar)
and
Code Description Cause Repair
300
O
2
below nominal value
Act. val. < nom. val. –1 %
• No O
2
• Prepressure low
• Supply line blocked
Check gas supply:
• Connect new gas cylinder
• Raise prepressure to 1 bar max.
• Check supply line to device
301
O
2
above nominal value
Act. Val. > nom. Val. +1 %
• Prepressure high Check gas supply:
• Reduce prepressure to 1 bar
304
O
2
sensor faulty
Sensor circuit open/shorted Contact Service
306 No O
2
supply Both O
2
cylinders empty Replace one or both O
2
cylinders
307 O
2
gas monitor failure
O
2
gas monitor faulty or not
connected
Check connection of O
2
gas monitor at
cylinders, contact Service as required
400 Water level low Water level ³ 1 min below
lower limit Check water level and refill water as
required
500 Temperature ContraCon
routine below nom. val. Actual value < 85 °C Repeat decontamination routine; contact
Service, as required
501 Temperature ContraCon
routine above nom. val. Actual value > 95 °C Contact Service
502 Failure in ContraCon
routine Power failure during heating
or holding phase Silence alarm by pressing key "90 °C“ (2
times 5 sec), then restart routine