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The Fiber Optic Pressure Module has two indicator lights and two push button switches
as shown in the photograph below. A green light is present when power is on. A yellow
light labeled "pulse" can have three conditions as follows:
1. On continuous to indicate either no sensor connected or the gage factors in
EEPROM memory are different than those currently being sent from the PC.
2. Flashing to indicate a zero is or maybe needed.
3. Off to indicate pressure measurements are being sent to the PC.
If the yellow light is on continuous and a pressure sensor is connected, press the "send
Cal" button to store the new gage factors in EEPROM memory. The yellow light should
then begin flashing to indicate a zero is necessary.
Zeroing the fiber optic pressure sensor
Before inserting the sensor into an animal, the sensor must be zeroed in air to ensure
that accurate absolute pressure values are displayed. The module can zero the sensor
when the yellow light is flashing. In that case, perform the zero calibration by pressing
the button labeled "zero". The yellow light should go out and the pressure reading on
the PC should go to zero.
Small offsets may occur within the first 30 seconds of power up and/or when the Fiber
Optic Pressure Module is in a very strong fringe field. Make certain the module has
been powered on for at least 30 seconds before performing the zero. Then move the
Fiber Optic Pressure Module into the location next to the bore where it will be located
during the MR procedure. Observe if the zero value remained. If it did not, perform the
zero again.
In the event that power is inadvertently interrupted to the Fiber Optic Pressure Module
during a procedure, the yellow light will flash for 15 seconds after power is restored.
The flashing yellow light is a reminder that a zero may be needed. However, in this
case, with the sensor in the animal, a new zero should not be performed. Instead the
Revision C, August 2013
Fiber Optic Pressure
13-5
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