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Water Bed Heater System
Turning on the Water Bed Heater control
With the pumps running, make certain the flow meter is reading between 1.5 and 2.5
gallons per hour. If the flow is less than 1.5 GPH refer to Appendix D. Click the option
to control on the Heater Module output temperature. Set the target set point. The
temperature of the water bed will typically be a few ºC below the Heater Module output
temperature.
Turn on power to the Heater Module. Click Start Heater. The yellow HEAT LED should
start to flash.
For a target temperature of 40 ºC the output water temperature should rise from room
temperature and become stable (< ±0.1 ºC) around the target temperature within 5
minutes.
Turning off the Water Bed Heater System
Click the "Stop Heater" button to turn off the Heater Module. Let the pumps continue to
run for 5 – 10 minutes to allow the temperature of the water in the Heater Module to
cool down. The yellow HEAT LED on the Heater Module should go off as soon as the
"Stop Heater" button is clicked, but the mixed water temperature will remain at the set
point for a few minutes as the control system is changing the hot and cold pumps
speeds. When the mixed water temperature (Tout) falls below the set point turn off the
Heater and Circulation Modules.
Changing the water bed
SAII water beds have the fitting glued to the water bed tubing. So, to remove the water
bed detach the fitting from the heater to bed tube set. Snip off about 1/8" from the end
of the tube set before attaching the new bed.
Before turning on the Heater Module run the pumps for a few minutes to remove air
from the system.
Polyether as an alternate fluid
Perfluorinated, inert polyethers with no hydrogen in the molecular structure can be used
in place of water to eliminate a fluid signal in MR images. These fluids have low
viscosity and low water absorption. They are nonflammable, nontoxic and safe for the
environment.
Polyether fluids are manufactured by Solvay Solexis, Inc. and distributed by the Kurt J
Lesker Company www.lesker.com.
Grade H110 with a boiling point of 110 ºC is
recommended for use with the Water Bed Heater System.
Revision C, August 2013
19-9
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