Arena Service Manual
(225°F). The thermostat turns off power to the heater to prevent
damage in case of a runaway temperature circuit failure.
For testing purposes, the heater has a resistance of approximately
10-20 Ω when cold. The thermistor has a resistance of
approximately 3 KΩ at 37 to 38°C and 5 KΩ at 25°C.
4.2.5 Concentrate Line Regulator(s) and Concentrate
Central Delivery Systems (optional)
Concentrate Line Regulators are recommended when a central
delivery system is used to feed concentrates into the Instrument.
Refer to Section 7, Dialysate Preparation, for more information.
4.2.6 Volumetric Proportioning System
The Instrument's volumetric proportioning system consists of fixed
volume pumps for concentrates and a fixed volume metering
device (Flow Equalizer) for dialysate. They are linked
electronically through the Ultrafiltration Controller to provide a
fixed ratio proportioning system.
Refer to Section 7, Dialysate Preparation, and Section 8,
Ultrafiltration, for more information.
4.2.7 Supply Manifold
The supply manifold controls the incoming water flow, mixes the
“A” dialysate concentrate component, removes the dissolved air
from the water, and monitors the “A” concentrate and water
conductivity. The supply manifold is composed of four
components:
• “A” Mix Chamber and Air Gap
• Air Removal Sprayer
• Air Trap and Level Sensor
• “A” Conductivity Probe/Thermistor Set
This manifold also contains the connections for the air removal
pump, and the “A” and “B” rinse fittings that connect through a
common line to the supply manifold and draw rinse water from
this source.
The “A” concentrate pump is described in Section 7, Dialysate
Preparation.
4-6 157-1278-893 Rev A
January 2004
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