3M 247 Model 247 Product Safety Features, Set-Point, Alert Type, Indication, Description

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English 3MTM RangerTM Irrigation Fluid Warming System

Model 247 Product Safety Features

The following chart describes the safety alarm features of the Ranger irrigation fluid warming unit.

Alert Type	Set-Point	Indication
Primary over-temperature	48°C	LED alternately displays
alert system		“HI” and temperature,
		alert sounds, alert
		light flashes.
Independent back-up	50°C	LED displays the
over-temperature alert		temperature or has gone
system (cut-off).		dark, alert sounds.
Under-temperature alert	33°C	LED displays “LO” and
		temperature, alert sounds,
		alert light flashes.

Description

Primary Alert: Alert sounds, controller cuts power to the heaters until temperature falls below 48°C. When heater temperature drops below 48°C, audible and visual alerts stop.

Primary failure. Temperature will rise to 50°C within a few seconds. The safety backup system is activated at 50°C and power is immediately shut off to the heating plates.

Heater temperature has fallen to 33°C. Alerts will stop when temperature rises above 33°C. Continue use of unit.

NOTE:

The difference in over-temperature alert system cut-off points does not indicate any difference in safety and is simply a result of tighter controller tolerances.

The Ranger irrigation fluid warming system is designed with very tight controls to regulate its temperature to the 41°C set-point. The microprocessor controller measures the temperature at the fluid pathway inside the warming plate four times every second, making it very responsive to changes in flow rate.

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