IV. Zeroing, Leveling and Calibration
Expression MR400 Instructions for Use
After the system has been primed and mounted, zero the transducer using one of the
Turn the zero reference stopcock "off" to the patient and remove
yellow non‐vented cap from the side port which opens the zero
reference stopcock to air.
The air-fluid interface of the zero reference stopcock should be at or
near the right atrial (mid-axillary) level.
Zero the transducer. Press the Zero All key. (Otherwise, to zero a
single channel, use Zero Set in the respective P1 or P2 menu; see
Zeroing All Pressure Channels (or Zeroing Pressure Channel for a
single channel if Zero Set was used) will be displayed and zeroing
will begin; where, upon completion, Done will be displayed to
If the transducer will not zero and an error condition occurs, verify
that the transducer is being used as described in the manufacturer's
instructions. Press Retry to attempt zeroing again. If the transducer
still does not zero, try another transducer and/or cable; and, if
condition persists, contact technical support or authorized service
Turn the zero reference stopcock "off" to the side port and replace
yellow non‐vented cap.
Attach desired catheter to distal end of monitoring kit and prime,
purging all air bubbles from catheter.
Open stopcock(s) to the catheter. (The catheter tip is now the
system air‐fluid interface.)
Monitoring Invasive Blood Pressure 8‐7