Bio-Med Air-Blender User manual

BIO-MED DEVICES

AIR/OXYGEN

BLENDER

SERVICE MANUAL

CATALOG #2121

REV 032709

BIO-MED DEVICES INC.

61 SOUNDVIEW ROAD, GUILFORD, CT 06437

[phone] FAX [phone] www.biomeddevices.com

TABLE OF CONTENTS

ADDENDUM 1- LOW FLOW SELECTOR KNOB			1
ADDENDUM 2- NEO2		BLEND BLENDER	1
1.	INTRODUCTION AND OPERATION		2
2.	WARNINGS AND CAUTIONS		6
3.	PREVENTIVE MAINTANENCE		7
4.	TOOLS		7
5.	DISASSEMBLY & REASSEMBLY		8
6.	CALIBRATION & TEST PROCEDURE		16
7.	PERFORMANCE CHECK		22
8.	TROUBLE SHOOTING GUIDE		23
9.	PARTS		24
10. BLENDER WARRANTY			26
11. CE MARK			28
12. SPECIFICATIONS			29

ADDENDUM 1- Low Flow Selector Knob

A low flow selector knob has been installed on some of the Bio-Med Devices Blenders (standard on units mounted on the Crossvent ventilators) in lieu of the auxiliary side port. This enables the user to maintain accurate concentrations using the single primary output for both high and low flows with a simple turn of the knob.

A label attached to the side of the blender indicates how to position the knob for accurate concentrations at settings less than or greater than the flow rate indicated. The knob must be pushed in prior to turning.

ADDENDUM 2- NEO2 BLEND Blender

The NEO2 BLEND is a low flow blender with two flowmeters mounted to it, one on each side. Any time this blender is used below 3 lpm, an internal bleed is required to maintain the accuracy of the O2 concentration being delivered. Due to the unique design of the NEO2 BLEND, this bleed is automatically activated when the flowmeter on the right is set to the “ON” position as described below. To conserve gas, this bleed may be turned off when this flowmeter is not in use. The flowmeter on the right side is for delivering flows below 3 lpm. The left flowmeter is generally used for flows above 3 lpm, but may be used below 3 lpm as explained below.

The flow rate for these flowmeters should be set using the center of the ball.

RIGHT SIDE FLOWMETER

The right side flowmeter and corresponding bleed is inactive when it is angled towards the front of the blender. To activate it and initiate the required bleed, push the flowmeter in towards the side of the blender and then rotate it clockwise (towards the back) to its vertical position. The internal bleed will now be active and the flow rate may be set using the knob on the flowmeter. To return the flowmeter and bleed to its off (inactive) state, return it to its angled position by pushing it in and rotating it counterclockwise (towards the front).

LEFT SIDE FLOWMETER

CAUTION: The flowmeter on the left side is stationary. Do not try to rotate it.

This flowmeter is meant for flows above 3 lpm. It may, however, be used below 3 lpm with the following consideration; when set below 3 lpm, turn on the required bleed by setting the right side flowmeter to its vertical position following the procedure as described above. Even though the flowmeter on the right is not being used, having it in the vertical position activates the internal bleed thereby guaranteeing O2 accuracy while using the left side flowmeter at flows below 3 lpm.

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1. INTRODUCTION AND OPERATION

The Bio-Med Air/Oxygen Blender is a precision proportioning device for mixing medical grade air and oxygen to any concentration from 21% to 100% oxygen and delivering it to a variety of respiratory care devices. The blender uses source air and oxygen at a pressure of 50 psi connected to two D.I.S.S. fittings on the bottom of the blender. Each fitting has a built-in 30 micron particulate filter. The gas source then passes through a duckbill check valve, which prevents reverse gas flows from either source.

WARNING: The factory installed Air and Oxygen gas supply fittings, which contain essential check valves and filters, must not be substituted with any other parts not approved by Bio-Med Devices. Doing so may cause gas supply contamination due to back-flow.

The blender uses a two-stage balancing system with the gas entering into each stage to equalize the operating pressure of the gas sources before entering the proportioning stage.

The gases then flow into the proportioning stage where they are mixed to the percentage dialed in on the front panel knob. This stage has a double-ended valve with valve seats on either end. Each one of these valve seats controls the passage of the air or oxygen to the outlet of the blender.

There are up to three gas outlets on the Bio-Med Devices blender depending on the model.

Figure 1 indicates the various standard configurations.

Blender Ports

Front

BC

AIR A O2

Figure 1

Model

Ports

Flow Range - Port “A”

Flow Range - Port

“C”3

2000K

A, Knob @C

6-50 lpm (No Bleed)

N/A

Knob Set >6

2002K21

0-50 lpm (6 lpm Bleed)

N/A

Knob Set< 6

2001

A, C

15-120 lpm (No Bleed)

N/A

2-108 lpm

(10-12 lpm Bleed)

2001K

A, Knob @C

15-120 lpm (No Bleed)

N/A

Knob Set >15

2002K2

2-108 lpm (10-12 lpm Bleed)

N/A

Knob Set< 15

2002

A

15-120 lpm (No Bleed)

N/A

N/A

2003

B, C

N/A

3-30 lpm (No Bleed)

0-30 lpm (3 lpm Bleed)

2004

A, B, C

15-120 lpm (No Bleed)

15-120 lpm (No Bleed)

2-108 lpm (10-12 Bleed)

Note 1. Mounted on Crossvent 2 ventilator. Note 2. Mounted on Crossvent 3 & 4 ventilators

Note 3. Some special order blenders may not have a bleed in this port. For these blenders, the output range would be the same as for those flows indicated with no bleed.

NOTE: The NEO2 BLEND with two flowmeters conforms to the model #2003 configuration with flow limited by the flowmeters. Refer to Addendum 2 in the beginning of this manual.

1.1 PRIMARY OUTLET

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Figure 2 illustrates the flow pattern when air and oxygen are provided to the inputs under normal conditions using the primary outlet for the exiting of blended gas. The gas sources enter the lower section of the blender where they pass by a shuttle spool. This spool is used for the alarm and remains balanced in this instance, thus blocking passage of gas to the alarm. The gases continue into the first stage of a two-stage balancing chamber. Here, the diaphragm reacts to any difference in source pressures and helps equalize these pressures. From here, the gases continue into the second stage of the balancing chamber where again, a diaphragm adjusts to equalize any remaining difference in pressure. The gases then exit the balancing chamber and enter the proportioning valve. Here the two gases are metered to the proper proportions resulting in the concentration as set by the knob on the front of the blender. From the valve, the now blended gas exits the blender through the primary outlet. Each outlet has a check valve that prevents gas from passing through it unless a hose or other device is threaded onto it.

Figure 2

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1.2 AUXILIARY OUTLET

Figure 3 illustrates the same conditions as Figure 2, but with the blended gas exiting the low flow auxiliary port. Use of this port induces a bleed to atmosphere which is necessary to maintain accurate concentrations when using the blender at flows of less than 15 lpm (3 lpm in the Low Flow Blender, 6 lpm in the 0-50 LPM Blender).

Figure 3

1.3 ALARM CONDITION

The blender has an audible alarm built in to detect if either of the gas sources changes by more than 20 psi (30 psi for units sold overseas) from the other. This will warn the user that they are running out of one of the gas sources or that there is a severe pressure drop in one source. If both gas sources drop or increase together such that a 20 psi (30 psi for units sold overseas) difference cannot be detected, then no alarm will sound. If the blender is connected but not being used and a 20 psi (30 psi for units sold overseas) difference in gas sources develops, the blender will not alarm.

The blender alarm/bypass function will provide > 90 LPM (≥30 LPM capability in the Low Flow

Blender, ≥50 in the 0-50 LPM Blender) upon the loss of air or oxygen, if the remaining gas is at 50

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psi. Fig. 4 illustrates the flow pattern when the air source is lost and only oxygen is provided to the input using the primary outlet for the exiting of gas. Notice two major events occurred relative to the previous figures. First, the alarm shuttle has shifted to the air side due to the absence of pressure on this side. This now exposes the passage to the alarm and the bypass to the outlet. Second, the diaphragm in the first stage of the balancing chamber has shifted due to the imbalance of pressure and has closed the oxygen side.

Figure 4

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2. WARNINGS AND CAUTIONS

WARNINGS:

Only qualified, trained service technicians should attempt repairs and service when needed.

The blender must not be exposed to extremely high temperatures, as in the case of steam autoclaving (which could reach 145 degrees F).

The blender is designed to operate from a 50 psig source of air and oxygen.

An oxygen analyzer should be used to verify the gas concentration and when making any adjustments to the concentration.

Be certain all components are properly installed prior to pressurizing the blender. Parts improperly installed may be ejected.

Bio-Med Devices cannot be held responsible for any failure to adhere to the recommendations set forth in this manual.

Because this is a CE marked device, it must never be modified without prior expressed written consent from Bio-Med Devices.

The factory installed Air and Oxygen gas supply fittings, which contain essential check valves and filters, must not be substituted with any other parts not approved by Bio-Med Devices. Doing so may cause gas supply contamination due to back-flow.

CAUTIONS:

Moisture or dirt can affect the operation of the blender; a clean dry gas source must be used at all times. The air must meet USP compressed air and ANSI Z86.1-1973 grade F and water vapor content cannot exceed a dew point of 5 degrees F. below the lowest ambient temperature to which the blender and accessories are exposed.

A water trap assembly and filter must be used to avoid malfunction should water accidentally get into the gas supply sources.

Always apply pressure to the blender slowly.

If the blender has a flowmeter on the left side, it is stationary. Do not try to rotate it.

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