AMI 221R Manual de usuario
OXYGEN DEFICIENCY
MONITOR
Operator Manual
MODEL 221R
TABLE OF CONTENTS
Special Message from Advanced Micro Instruments (AMI):
Thank you for purchasing this MODEL 221R for oxygen deficiency monitoring. This
permanent mount analyzer is designed to alert you and your employees to unsafe oxygen
levels within an enclosed area. The audible alarm and relay outputs activate when an
oxygen-depleted or oxygen-rich environment is detected. The unit's special design provides
exceptional protection while eliminating the frustrations of having to deal with false alarms.
Note: Read this manual carefully prior to installation.
OPERATOR MANUAL
MODEL 221R
ANALYZER OVERVIEW 2
METHOD OF MEASUREMENT: 3
SAFETY, WARNINGS & CAUTIONS 4
ANALYZER INSTALLATION 5
ANALYZER OPERATION 13
ANALYZER CALIBRATION 15
SENSOR REPLACEMENT 19
TROUBLESHOOTING/SERVICE 19
ANALYZER ACCESSORIES 20
SPECIFICATIONS 21
AMI®WARRANTY 23
LIMITED WARRANTY/DISCLAIMER 23
LIMITATION OF LIABILITY 23
LIMITATION OF REMEDIES 23
1
Protective Earth
Ground
ANALYZER OVERVIEW
Mounting Hole (x 4)
LCD Screen
SILENCE Button
Analyzer
Enclosure
(left side view)
(front view)
oxygen sensor
location
UP Arrow
Button
SPAN Button
DOWN Arrow
Button
I/O Access for Communication
Name Plate
Electrical Access
Plate
AVAILABLE CONFIGURATIONS
(must be specified at time of purchase)
BASE UNIT ONLY
(PART # 6ANA0600)
UNIT
WITH POWER CORD
(PART # 6ANA0605)
UNIT
WITH REMOTE PROBE
(PART # 6ANA0615)
UNIT
WITH POWER CORD
& REMOTE PROBE
(PART # 6ANA0610)
(right side view) (bottom view)
I/O Access for Power
2
METHOD OF MEASUREMENT:
ZIRCONIUM OXIDE SENSORS
The MODEL 221R utilizes zirconium oxide sensors, which provides reliable, accurate percent
oxygen measurements for a general purpose environment.
•These sensors have up to a 10-year product life. This eliminates the need to replace sensors every
6 months and the need to perform monthly calibrations, which drastically lowers maintenance
costs.
3
SAFETY, WARNINGS & CAUTIONS
Violation of the National Electrical Code requirements (especially Article 500 that deals with hazardous areas)
may cause a fire or explosion with the potential for serious injury or loss of life.
Make sure no hazardous gas is present in the area before and during installation.
WARNING
You must follow all installation requirements and environmental conditions to avoid protection impairment.
Do not mount the MODEL 221R analyzer in a hazardous area, where explosive gases may be present. The
zirconium oxide sensor will ignite flammable gas mixtures.
A switch or circuit-breaker shall be included in the building installation for the AC power connection. The circuit
breaker should be as close as possible to the unit and within easy reach for the operator. The circuit breaker
should be marked as the disconnecting device for the analyzer.
You must follow the National Electrical Code (NEC) in your installation.
A supplied IEC power cord must be used if the unit is not to be hard wired. You must follow the National Electrical
Code (NEC) in your installation.
If the unit is hard-wired, the AC wire connecting to the circuit board is made using the three pin Phoenix
combination connector located behind a protective white metal shield.
The Protective Earth Ground Lug on the unit must be connected to the High-Quality Protective Earth Ground using
a16-gauge wire.
WARNING
CAUTION
4
ANALYZER INSTALLATION
CAUTION:
The MODEL 221R is designed for operation between 41°F to 104°F.
•It is highly recommended that the Oxygen Deficiency Monitor be installed close to the potential
leak source, most likely to be the cause of oxygen depletion
•The zirconium oxide sensor is located on the right side of the box. Make sure that this side is properly
orientated to the potential source of oxygen depletion.
•The Oxygen Deficiency Monitor is designed to be mounted in a general-purpose area. Do not install
it in a hazardous area containing flammable gases.
•It is recommended that you purchase the optional power cord with your unit. This will allow you to
unplug and move the unit to an area with fresh ambient air when scheduled calibration needs to be
performed. Note: The unit is also designed to be hard-wired if that is your preference
•Analyzer must be connected to a solid ground for the highest level of RFI protection and safety.
•Use 18 to 16 gauge wire for your electrical connections.
Key Points:
CAUTION:
Ventilation Requirements:
Install the unit near the area where the oxygen levels need to be monitored. Leave a gap of at
least 12” around all faces of the unit’s case. (Note: This gap does not include the unit’s backside).
CAUTION:
The MODEL 221R is designed for monitoring of atmospheric air. Use of the unit to monitor
process gas will shorten the life of the zirconium oxide sensor and void the warranty.
ANALYZER ENGINEERING DRAWING
5
1. Place the Oxygen Deficiency Monitor at a desired location. It is recommended to position the unit at
eye-level. Make sure the location is no more than 6 ft from an electrical outlet if the unit has the standard 6-ft
cord.
2. Secure the unit to the wall using the 4 mounting holes.
3. Plug the Power Cord into an AC Power Outlet (The length of the power cord is 6 ft).
1. Turn off the mains power.
2. Place the Oxygen Deficiency Monitor at a desired location. It is recommended to position the unit at eye-level.
3. Secure the unit to the wall using the 4 mounting holes.
OPTION 1: INSTALLATION WITH THE POWER CORD
OPTION 2: HARD WIRING
6
5. Remove the Access Plug on the bottom side of the MODEL 221R.
6. Install a cable gland in the I/O Access for Power. The cable gland should be rated to NEMA 4X (IP65) at the
minimum or NEMA 6 (IP68), which is recommended. A cable gland can be acquired from AMI as a separate
purchase (Part # 1CON02).
Electrical Access
Plate
4. Remove the Electrical Access Plate on the MODEL 221R to reveal the electrical connections.
7
8. Remove the 3-terminal green connector from the terminal strip for easier wiring.
9. Make the following electrical connections to the proper positions on the Phoenix connector.
– Connect the fused line side of a 90 —240 VAC power source to the H terminal
– Connect the neutral from the power source to the N terminal
– Connect the shield ground to a good earth ground or equivalent.
IMPORTANT: When attaching wiring to the green terminal connectors, use either solid wire or
stranded wire with wire ferrule(s) attached. Verify no loose strands are visible after
installation of wire ferrule(s).
7. Feed cable through the cable gland, which fits Cord OD of 0.24" to 0.47".
10. Re-install the 3-terminal green connector firmly back in its place in the terminal strip.
8
HARD WIRING FOR RS485 COMMUNICATIONS, 4–20mA, AND ALARM RELAYS
Follow the next several steps to wire RS485 Communications, 4–20 mA or Alarm Relays. If you do not wish to include
any of these in your installation, skip this section and proceed to Step 14.
Metal Hole Plug
11. Remove the Metal Hole Plug.
12. Install a cable gland to the I/O Access for Communication. The cable gland should be rated to NEMA 4X
(IP65) at the minimum or NEMA 6 (IP68), which is recommended. A cable gland can be acquired from AMI
as a separate purchase (Part # 1CON02).
13. Feed cable through the cable gland.
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