ENGLISH
14
WWW.MAXTEC.COM • (800) 748-5355
11.4 Alarm/Bypass Function
The MaxBlend 2 includes a pressure differential alarm which provides an audible alarm if gas
source pressures differ by 20 PSI (1.3 BAR) (nominal) or more, or if there is a gas supply failure
of one of the source gases. This alarm is generated by a reed alarm located in a cap on the
bottom of the MaxBlend 2.
The primary purpose of the alarm is to audibly warn the operator of an excessive pres-
sure drop or depletion of either source gas pressure. Should both gas pressures increase or
decrease simultaneously, an alarm will not activate.
If either source gas pressure drops, the outlet pressure will drop similarly, as the mixed gas is
always balanced to that of the lower gas source.
The gas bypass function operates in unison with the alarm. Once the pressure alarm is acti-
vated, the bypass function is actuated and the gas with the higher pressure flows directly to
the outlet port, bypassing the mixing function of the MaxBlend 2. The oxygen concentration
flowing out of the MaxBlend 2 will be that of the gas with the higher pressure. In the alarm/
bypass mode, the blender will deliver oxygen (100%) or medical air (21%) until pressures have
been restored to a differential of 6 PSI or less (0.4 BAR).
If the MaxBlend 2 is set to deliver 21% and the OXYGEN source pressure is reduced enough
to produce a 20 PSI (1.3 BAR) differential, the unit may not alarm because it will continue to
deliver 21% concentration according to the setting. If the setting is moved slightly from 21%,
the pressure differential alarm will sound. Similarly, if the MaxBlend 2 is set to deliver 100%
and the AIR source pressure is reduced or lost, the unit may not alarm because it will continue
to deliver 100% concentration.
12.0 FLOW CHARACTERISTICS
The outlet pressure of the MaxBlend 2 decreases as the total flow rate increases. The total flow
rate is the measurement of the total flow from all outlet ports. The charts below indicate the
pressure drop that occurs for both low flow, and high flow, models at 3 inlet pressure settings;
30 PSIG (2.07 BAR), 50 PSIG (3.45 BAR), and 75 PSIG (5.17 BAR).
The fixed acrylic flowmeter on the left side of the MaxBlend 2 has been pressure compensated
to accommodate for the pressure loss through the blender at each flow rate, using an inlet
pressure of 50 PSIG.
Flow Rate -vs- Pressure Drop:
0
5
10
15
20
25
0
20
40
60
80
100
120
Pr
essur
e dr
op (PSIG)
Flow Rate (LPM)
30 psig
50 psig
75 psig
For High Flow Blender
0
5
10
15
20
25
0
5
10
15
20
25
30
35
Pr
essur
e dr
op (PSIG)
Flow Rate (LPM)
75 psig
50 psig
30 psig
For Low Flow Blender
13.0 ELECTROMAGNETIC
COMPATABILITY
The information contained in this section (such as separation distances) is in general specifi-
cally written with regard to the MaxBlend 2. The numbers provided will not guarantee fault-
less operation but should provide reasonable assurance of such. This information may not
be applicable to other medical electrical equipment; older equipment may be particularly
susceptible to interference.
NOTE:
Medical electrical equipment requires special precautions regarding electromagnetic
compatibility (EMC) and needs to be installed and put into service according to the EMC infor-
mation provided in this document and the remainder of the instructions for use this device.
Portable and mobile RF communications equipment can affect medical electrical equipment.
Cables and accessories not specified within the instructions for use are not authorized. Using
other cables and/or accessories may adversely impact safety, performance and electromag-
netic compatibility (increased emission and decreased immunity).
Care should be taken if the equipment is used adjacent to or stacked with other equipment;
if adjacent or stacked use is inevitable, the equipment should be observed to verify normal
operation in the configuration in which it will be used.
ELECTROMAGNETIC EMISSIONS
This equipment is intended for use in the electromagnetic environment specified below.
The user of this equipment should assure that it is used in such an environment.
EMISSIONS
COMPLIANCE
ACCORDING TO ELECTROMAGNETIC ENVIRONMENT
RF Emissions
(CISPR 11)
Group 1
The MaxBlend 2 uses RF energy only for its
internal function. Therefore, its RF emissions
are very low and are not likely to cause any
interference in nearby electronic equipment.
CISPR Emissions
Classification
Class A
The MaxBlend 2 is suitable for use in all
establishments other than domestic and
those directly connected to the public low-
voltage power supply network that supplies
buildings used for domestic purposes.
NOTE:
The EMISSIONS characteristics of this
equipment make it suitable for use in industrial
areas and hospitals (CISPR 11 class A). If it is used
in a residential environment (for which CISPR
11 class B is normally required) this equipment
might not offer adequate protection to radio-
frequency communication services. The user
might need to take mitigation measures, such
as relocating or re-orienting the equipment.
Harmonic Emissions
(IEC 61000-3-2)
Class A
Voltage Fluctuations Complies
