Trio™ Operating Instructions 0070-10-0666-01 2 - 27
Operations Parameter Menus
Heart Rate Alarm Limits
Alarms occurring during the process of ECG measurement include two (2) types: 
physiological alarms and technical alarms. Physiological alarms occur when the patient’s 
heart rate value is equal to or exceeds set alarm limits. Technical alarms are any ECG-related 
alarms, which are not physiological, such as functional failures.
2.4.1.7 ECG Troubleshooting 
PATIENT SIZE HIGH ALARM (bpm) LOW ALARM (bpm)
Adult (ADU) 60 – 250 [150] 30 – 120 [45]
Pediatric (PED) 100 – 300 [175] 30 – 150 [70]
* Factory default values shown in brackets.
MESSAGE/
PROBLEM REASON SOLUTION
ECG LEAD OFF, or 
ECG XX LEAD OFF
ECG electrodes are detached from the 
skin, ECG cables are disconnected 
from the monitor or ECG lead wires 
are disconnected from ECG cable
Check all patient connections. Prep 
chest, change electrodes, check 
and replace leads.
ECG INIT ERR ECG module failure Notify hospital technician or 
Customer Support
ECG COMM STOP Intermittent communication failure Notify hospital technician or 
Customer Support
ECG COMM ERR Intermittent communication failure Notify hospital technician or 
Customer Support
HR ALM LMT ERR Functional failure Notify hospital technician or 
Customer Support 
ECG NOISE ECG signal interference Apply fresh, moist electrodes.
Replace cable or lead wires as 
necessary.
Eliminate 60 Hz interference. Use 
ECG cable with internal filter block.
Noisy ECG trace Loose or dry electrodes Apply fresh, moist electrodes.
Defective cable or lead wires Replace cable or lead wires as 
necessary
Patient cable or leads are routed too 
close to other electrical devices.
Eliminate 60 Hz interference. Use 
ECG cable with internal filter block.
Excessive Electro-
surgical 
Interference
Inadequate skin preparation prior to 
application of electrode
Repeat skin preparation and 
electrode placement procedures.
Apply fresh, moist electrodes.
Intermittent Signal Connections not tight and/or properly 
secured
Ensure proper connection. (cable to 
monitor, cable to lead, lead to 
electrode).
Electrodes dry or loose Repeat skin preparation and apply 
fresh, moist electrodes.
Cable or leadwires damaged Check with a continuity tester.