GE B30 Technical Reference Manual page 46

B30 Patient Monitor
Software control
The software controls valves and a pump. In addition to the individual on/off signals for each
component there is a common power switch for the valves and the pump that can be used at
pump/valve failures.
In addition to external RS485 reset line, the microprocessor system is equipped with its own
power-up reset. See the section in the ECG board's description: "RS485 communication"
Safety circuit
The NIBP board is equipped with an independent safety circuit to disconnect supply voltages
from the pump and the valves if the cuff has been pressurized longer than the preset
maximum measurement time, or if the pressure of the cuff is inflated over the specified
pressure limit. The maximum measurement time values and pressure limits for different
measurement modes have been specified in the technical specification section of this manual.
Pneumatics
The module has the following pneumatics parts:
1. Intake air filter; for preventing dust and other parts from entering the air pump and the
valves.
2. Air pump; for pumping the measuring pressure of the cuff.
3. (Pulse) Valve; for producing a linear pressure fall (bleeding) in order to measure the blood
pressure of the patient.
Note that in the service menu also names Valve and Set valve have been used for this
valve.
4. Safety valve; The safety valve is intended to be used for deflating the cuff in single fault
case, i.e. to prevent too long a measurement time or too high an inflation pressure of the
cuff.
Note that lso Exh2 valve has been used to designate the Safety valve in service menu.
5. Main pressure sensor; for measuring the pressure of the blood pressure cuff and the
pressure fluctuations caused by arterial wall movement.
6. Safety pressure sensor; for detecting the , cuff loose, cuff occlusion situations, etc. and
for recognizing the pressure sensor fault.
7. Cuff connector; for connection and hose identification.
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Document no 2044677-001