4 Cableless Monitoring
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Audio Signal CL Transducers
The Avalon CL transducers have three audio signals:
• If an ascending tone sequence is played three times, the transducer was triggered by the fetal
monitor to page the patient wearing it, or to locate a not docked transducer.
• If the CL transducer's battery is empty, the transducer issues three beeps in intervals.
• An INOP tone indicates that the transducer has detected a technical problem (INOP). Check your
fetal monitor for a related INOP message.
Standard Radio Range of CL Transducers
The CL transducers have an operating range around the base station of at least 100 m/300 ft in the
line of sight. Obstructions such as walls, metal doors, elevators, and other environment structures can
lead to signal loss. The CL symbol indicator and the
Tele Info window on the monitor's display (see
“Screen Elements” on page 39 and “Tele Info Window” on page 94) provide information on the
status of the signal strength.
When a patient is approaching the end of range, the US sound is replaced by an artificial QRS sound
(like DECG), and the DECG and MECG waves are no longer displayed on the monitor.
Out of Range
If the patient walks out-of-range, the CL transducer LED lights up cyan and every 16 seconds a two-
tone audio signal is emitted. At the monitor the INOP e.g.
cl US Disconnect is issued. Inform the
patient to return to the CL base station, when a CL transducer starts beeping.
Radiated Transmission Power
The Avalon CL transducers provide all the benefits and flexibility of cableless operation, but do so
with an effective radiated transmission power significantly less than that of a typical remote controlled
child’s toy or mobile phone.
Extended Range Radio
Using the optional CL Wide Range Pod extends the radio range of the CL transducers and the
CL Pods to the local WLAN infrastructure. If the CL Wide Range Pod is active, the US sound is
replaced by an artificial QRS sound (like DECG), and the DECG and MECG waves are no longer
displayed on the fetal monitor. Numerics, alarms, and traces are shown at the fetal monitor as usual.
See also “CL Wide Range Pod” on page 91.
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