ENMET MedAir 2000 User Manual
ENMET Corporation
PO Box 979
Ann Arbor, MI 48106-0979
MED AIR 2000
Operation and Maintenance
Manual
80002-031
06/03/96
Revised 06/11/97
MCN-167, 09/20/00
MCN-176, 03/06/98
MCN-200, 09/04/98
MCN-204, 01/29/99
MCN-237, 09/21/00
MCN-274, 05/01/02
MCN-327, 02/03/05
MCN-332, 04/15/05
Table of Contents
1.0 INTRODUCTION ......................................................................................................................................... 1
1.1 Unpack .............................................................................................................................................................1
1.2 Check Order .....................................................................................................................................................1
1.3 Serial Numbers.................................................................................................................................................1
2.0 I
NSTRUMENT FEATURES ............................................................................................................................ 2
2.1 Exterior Features ..............................................................................................................................................2
2.2 Display Panel Features ..................................................................................................................................... 2
2.3 Circuit Board Features......................................................................................................................................4
2.4 Power Supply ...................................................................................................................................................4
2.5 Dew Point Sensor.............................................................................................................................................4
2.6 Dew Point Circuit.............................................................................................................................................4
3.0 I
NSTALLATION .......................................................................................................................................... 5
3.1 Mounting of Instrument....................................................................................................................................5
3.2 Sample Air Supply ...........................................................................................................................................6
3.3 Power Supply ...................................................................................................................................................6
3.4 Outputs .............................................................................................................................................................6
3.4.1 Relay Contacts .......................................................................................................................................6
3.4.2 Optional 4-20mA Outputs ......................................................................................................................7
3.5 Initial Calibration .............................................................................................................................................7
4.0 O
PERATION .............................................................................................................................................. 8
4.1 Normal Operation Condition............................................................................................................................ 8
4.2 Alarm Set Points...............................................................................................................................................8
4.3 Alarm Latching ................................................................................................................................................8
4.4 Audio Defeat ....................................................................................................................................................9
4.5 Display .............................................................................................................................................................9
4.6 Operational Menu.............................................................................................................................................9
4.7 Fault Indications.............................................................................................................................................10
4.7.1 Low Flow Indication ............................................................................................................................10
4.7.2 Other Fault Indications........................................................................................................................10
4.8 Dew Point Sensor Response...........................................................................................................................10
5.0 M
AINTENANCE........................................................................................................................................ 11
5.1 Maintenance Menu.........................................................................................................................................11
5.1.1 Key .......................................................................................................................................................12
5.1.2 Automatic Zeroing................................................................................................................................13
5.1.3 Calibration...........................................................................................................................................14
5.1.4 Select Alarm Set Points ........................................................................................................................15
5.1.5 Set Latches ...........................................................................................................................................16
5.1.6 Set the Key............................................................................................................................................16
5.1.7 Exit .......................................................................................................................................................16
5.2 Sensor Replacement .......................................................................................................................................17
5.2.1 CO Sensor ............................................................................................................................................17
5.2.2 Oxygen Sensor......................................................................................................................................17
5.3 Humidifier Tube.............................................................................................................................................17
5.4 Dew Point Sensor...........................................................................................................................................17
5.5 Flow Control Orifice ...................................................................................................................................... 17
5.6 Particulate Filter Replacement .......................................................................................................................17
6.0 R
EPLACEMENT PART NUMBERS .............................................................................................................. 19
7.0 WARRANTY......................................................................................................................................... 20
A
PPENDIX A ................................................................................................................................................. 21
List of Figures and Tables
FIGURE 1: FEATURES OF MED AIR 2000 EXTERNAL................................................................................................ 3
F
IGURE 1A: REGULATOR ....................................................................................................................................... 3
FIGURE 2: MED AIR 2000 INTERIOR FEATURES....................................................................................................... 4
F
IGURE 3: MED AIR 2000 MOUNTING DIMENSIONS ................................................................................................. 5
FIGURE 2A: TERMINAL STRIP................................................................................................................................. 6
ABLE 1: RELAY CONTACTS .................................................................................................................................. 6
T
T
ABLE 2: FAULT RELAY CONTACTS ....................................................................................................................... 7
TABLE 3: OUTPUTS FOR 4-20MA FOR S/N 599 AND BELOW.................................................................................... 7
TABLE 3A: OUTPUTS FOR 4-20MA FOR S/N 600 AND ABOVE.................................................................................. 7
F
IGURE 4: MED AIR 2000 OPERATIONAL DISPLAY.................................................................................................. 8
TABLE 4: FACTORY ALARM SET POINTS................................................................................................................. 8
FIGURE 5: MED AIR 2000 OPERATION MENU FLOW CHART..................................................................................... 9
F
IGURE 6: MED AIR 2000 MAINTENANCE MENU FLOW CHART. ............................................................................. 11
FIGURE 7: CONNECTION OF CALIBRATION GAS CYLINDER..................................................................................... 13
TABLE 5: FAULT ALARM ...................................................................................................................................... 15
F
IGURE 8: REMOVE SHORTING CLIP..................................................................................................................... 18
FIGURE 9: MANIFOLD ........................................................................................................................................... 18
FIGURE 10: LOCATION OF PARTS FO R REPLACEMENT........................................................................................... 18
F
IGURE 11: CARBON MONOXIDE CONCENTRATION ............................................................................................... 21
Reference Information:
N
OTE: [important information about use of instrument]
C
AUTION: [affects equipment – if not followed may cause damage to instrument, sensor etc…]
WARNING: [affects personnel safety – if not followed may cause bodily injury or death.]
MED AIR 2000 ENMET Corporation
1.0 Introduction
The MED AIR 2000is a gas and dew point detection instrument that monitors compressed air from medical air supply
systems for certain hazards to the user. The instrument is available with sensors that monitor air for carbon monoxide
(CO), for variations in the oxygen (O
can be used together. In the instrument, a sample of the compressed air is passed over electrochemical CO and O
sensors, a solid state dew point sensor and the resultant electrical outputs are used to evaluate the air for the target
gases. Some features of the instruments are as follows:
continuous monitoring of the sample air
continuous LCD display of gas and vapor concentrations
menu driven operational and maintenance controls
menu driven calibration procedure
audio and visual alarms indicate unsafe conditions
alarm relay contacts available on terminals
a fault relay and visual fault alarm
flowmeter plus low flow fault indication and display
alarm acknowledgement capability including audio defeat
mA outputs for each target gas
NEMA-12 packaging
NOTE: All specifications stated in this manual may change without notice.
1.1 Unpack
Unpack the MED AIR 2000and examine it for shipping damage. If such damage is observed, notify both ENMET customer
service personnel and the commercial carrier involved immediately.
) content and for dew point. The sensors can be used alone or up to three sensors
2
2
Regarding Damaged Shipments
NOTE: It is your responsibility to follow these instructions. If they are not followed, the carrier will
not honor any claims for damage.
This shipment was carefully inspected, verified and properly packaged at our company and delivered to the carrier in good
condition.
When it was picked up by the carrier at ENMET, it legally became your company’s property.
If your shipment arrives damaged:
• Keep the items, packing material, and carton “As Is.” Within 5 days of receipt, notify the carrier’s local office and request
immediate inspection of the carton and the contents.
• After the inspection and after you have received written acknowledgment of the damage from the carrier, contact ENMET
Customer Service for return authorization and further instructions. Have your Purchase Order and Sales Order numbers
available.
ENMET either repairs or replaces damaged equipment and invoices the carrier to the extent of the liability coverage, usually
$100.00. Repair or replacement charges above that value are your company’s responsibility.
The shipping company may offer optional insurance coverage. ENMET only insures shipments with the shipping company
when asked to do so in writing by our customer. If you need your shipments insured, please
ENMET Customer Service.
forward a written request to
Regarding Shortages
If there are any shortages or questions regarding this shipment, please notify ENMET Customer Service within 5 days of receipt at
the following address:
ENMET Corporation
680 Fairfield Court
Ann Arbor, MI 48108
734-761-1270 734-761-3220 Fax
1.2 Check Order
Check, the contents of the shipment against the purchase order. Verify that the MED AIR 2000 is received as ordered. If there are
accessories on the order, ascertain that they are present. Check the contents of calibration kits. Notify ENMET customer service
personnel of any discrepancy immediately.
1.3 Serial Numbers
Each MED AIR 2000 is serialized. These numbers are on tags on the equipment and are on record in an ENMET database.
1
ENMET Corporation MED AIR 2000
2.0 Instrument Features
2.1 Exterior Features
The exterior of the instrument is shown in Figure 1. The exterior features are as follows:
Feature Description
Enclosure
Sample Air Hose
Sample Port
Sample/Calibration
Valve
Calibration Port
Front Cover Latch
Humidifier Tube
Line Cord
Audio Alarm
Mounting Flanges
Regulator
(Not supplied)
A NEMA-12 plastic box, approximately 10x8x6, with a clear hinged front cover.
A five foot long hose to conduct a sample of the air from the source to the instrument.
See Figure 1A.
The fitting for the sample air hose.
A red handled ball valve which directs the air from either the sample or the calibrate port.
The handle points at the port, sample or calibrate, which is providing the air to the
instrument
The entrance for the calibration gas. The quick release fitting mates with one on the
calibration adapter.
A quick-release latch that holds the clear front cover in place, and is capable of being
padlocked if desired.
Located under a black sheet metal cover. Is a tube that extracts moisture from the
atmosphere and adds it to dry sample air, before it is presented to the carbon monoxide and
oxygen sensors.
A cord to supply 110 V
A loud horn activated by certain alarm conditions.
Flanges with holes for mounting the enclosure to a vertical surface.
To connect to the compressed air line. Line pressure to the M
55 PSI. See note Figure 1A
AC to the equipment. Not illustrated.
ED AIR 2000 should be set to
2.2 Display Panel Features
The display panel, shown in Figure 1, is viewed through the clear front cover of the enclosure, and is accessed by
opening the cover. Features are as follows:
Feature Description
Display
Flowmeter
Visual Alarms
Pushbutton Switches
•Option Switch
•Select Switch
•Alarm Acknowledge/
Audio Defeat Switch
A 2 line, 16 character per line, LCD with backlight. The numerical values of gas
concentrations, and other information are displayed.
A flow indicator located at the output of the sample flow stream, which indicates
quantitatively the flow of sample air or calibration gas through the instrument.
On both sides of the display, a red LED for each sensor on the instrument.
Near the center of the panel,. a green power LED and a red fault LED,
There are three of these, located near the center of the panel; they are yellow
rectangular membrane switches. They are:
The top left switch.
Directly to the right of the option switch.
Directly under the option switch.
2
MED AIR 2000 ENMET Corporation
r
f
p
Visual Alarm
Dew Point
If Dew Point option is installed)
(
Audio Alarm
OPTION
Switch
ALARM ACKNOWLEDGE/
LARM DEFEAT
A
Switch
Flow Mete
Strain Relie
for Line Cord
CO
ppm
Dew
Point
ALARM
ACKNOWLEDGE
Visual Alarm
CO
AUDIO
DEFEAT
SELECTOPTION
POWER
FAULT
Cover, Humidifier Tube
Display
Visual Alarm O2
(If Oxygen option is installed)
O
2
%
Power LED
Calibration
Port
SELECT
Switch
Front Cover Latch
Fault LED
Sample/Calibration
Valve
Mounting Flanges
2 places
Figure 1A: Regulator
Figure 1: Features of MED AIR 2000 External
NOTE: When connecting to a standard 55 PSI USA Medical
air systems, Regulator is Not required.
Regulator is Not supplied by ENMET
Sample Air Hose
to Sam
le Port
3
Sample Port
Input
See note below
ENMET Corporation MED AIR 2000
2.3 Circuit Board Features
The Display Panel is hinged on the right and is released by unscrewing the 2 thumb screws located in the left corners.
After releasing the panel, it is swung to the right, exposing the interior of the enclosure. The Circuit Board is mounted
on a plate at the back surface of the enclosure interior. Features are shown in Figure 2.
Feature Description
Terminal Strip
Manifold Housing
This twenty-three position terminal is located at the bottom of the Circuit Board. On
it are twelve positions for three contacts for each of four alarm relays, and three
positions for the contacts of a fault relay.
There are also two positions for each of the 4-20 mA outputs. (optional)
The sample manifold, the carbon monoxide and oxygen sensors are located under
this small aluminum housing. Not illustrated in figure 2, see Figure 8.
2.4 Power Supply
The power supply circuit is located on the bottom surface of the inside of the enclosure. The circuit is protected by
two 1.0 Amp fuses mounted in fuse holders on the power supply board.
2.5 Dew Point Sensor
If present in the instrument, the solid state dew point sensor is located on the plate to the right of the main circuit board.
2.6 Dew Point Circuit
If present in the instrument, the dew point circuit is located on the top surface of the inside of the enclosure.
Cover, Humidifier Tube
Humidifier
Tube
Audio Alarm
Sensor Dew Point
If Dew Point option
is installed
Particulate
Filter
Fuse Holder
Power Supply
PCB
Sensor O2
If Oxygen option is
installed
Sensor CO
Terminal Strip
Power Supply
PCB
Figure 2: MED AIR 2000 Interior Features
4
MED AIR 2000 ENMET Corporation
3.0 Installation
3.1 Mounting of Instrument
The MED AIR 2000 should be located near the pipe or tank containing the air to be monitored, and upstream from
where the air is being used. So that, the air sample enters the instrument before it reaches the users.
Upright (plumb and level) vertical orientation of the instrument is necessary for proper operation. Mount the
instrument on an appropriate vertical surface using the mounting flanges provided. Avoid areas with excessive
vibration. The holes in the flanges are 0.31 inch in diameter and form a 6 x 10.75 inch rectangle. See Figure 3.
Mounting Holes
0.31” dia. 4 places
Dimensions are in inches.
SELECTOPTION
AUDIO
DEFEAT
ALARM
ACKNOWLEDGE
POWER
FAULT
Figure 3: MED AIR 2000 Mounting Dimensions
5
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