Watchdog

PERFECT BALANCE OF MEASUREMENT PERFORMANCE & VALUE

The WATCHDOG is an advanced Trace or Percent Oxygen Analyzer designed to include all the essential features and deliver a high level of accuracy and reliability for sheltered installations in Class 1, Div. 2 areas at a lower price point. It is outfitted with a complete sample system using AMI’s patented ELIMINATOR CELL BLOCK and our ultra-fast oxygen sensor technologies. Key features include multiple selectable analog outputs ranges, isolated 4-20ma or 1-5VDC output, data logger and COMMAND CENTER software.

Technical Specifications

Physical & Electrical Specifications
WEIGHTMOUNTINGGAS CONNECTIONSWETTED
PARTS
6.0 lbs
(2.72 kg)
Wall Mount
or 2.0” Pipe
¼” 316 S.S.
compression
fittings
316 S.S. fittings, electro-less nickel-plated cell block, gold-plated contacts, acrylic flow meter & O-rings (Viton, kalrez, and Buna-N)
POWER
DCAC
10 - 28 VDC <50 mA max @ 12VDCNot Available
watchdog dimensions
Note: 2-year Warranty for Parts & Labor for any defects in materials or workmanship. 6-month Warranty for oxygen sensors
Operational Specifications
OUTPUT RANGES
(USER SELECTABLE)
AMBIENT OPERATIONAL
TEMPERATURE
FLOW RATE
(RECOMMENDED)
INLET GAS
PRESSURE
0 – 10 ppm
0 – 50 ppm
0 – 100 ppm
0 – 500 ppm
0 – 1000 ppm
0 – 5000 ppm
0 – 1.0%
0 – 5.0%
0 – 10.0%
0 – 25.0%
25°F to 115°F
(–3.9°C to 46°C)
0.1 to 2.0 SCFH
(0.05 – 1.0 Lpm)
0.5 − 150 psig
(0.03 − 10.3 bar)
Sensor & Analyzer Performance Specifications
T-2 SensorT-4 SensorP-2 SensorP-3 SensorP-4 SensorP-5 Sensor
Max Range
0 –10,000 ppm

Special Conditions
<10 ppm H2S, 100% CO2
Max Range
0 –10,000 ppm

Special Conditions
<500 ppm H2S, 100% CO2
Max Range
0 – 50%
90% upscale response:
8 sec
Special Conditions:
O2 in inert gas
Max Range
0 – 25%
90% upscale response:
30 sec
Special Conditions:
Up to 100% CO2
Max Range
0 – 100%
90% upscale response:
30 sec
Special Conditions:
Enriched Oxygen
Max Range
0 – 25%
90% upscale response:
30 sec
Special Conditions:
<500 ppm H2S
100% CO2
90% UPSCALE RESPONSE TIMES
FOR SPECIFIC RANGES
REPEATABILITYAPPROVALS
<25 sec for
0.0 – 10 ppm
<10 sec for
10 ppm – 25.0%
±1% of range or
±0.2 ppm of oxygen,
whichever is greater
Designed to meet requirements for Class I, Div. 2, Groups C,D applications
Analyzer Key Features
ELIMINATOR CELL BLOCKContains a Complete Sample System with all components, including the flow meter, metering valve, pressure sensor and 3-way Selection (Sample/Span/Off) Valve, fully integrated
ANALOG OUTPUTS1 − 5 VDC and 4 − 20mA isolated output signals and Modbus bi-directional RS485 communication
COMMAND CENTERSoftware that works across AMI’s Analyzers and gives users access to advanced functions:
  • Calibration Details
  • Data Logger (records O2  measurements, temperature, psig, and power)
ACCESSORIES
  • Demister
  • LRP
  • Oxygen Sensors

Features & Benefits

Eliminator Cell Block with Component Call-Outs
Transparent View of ELIMINATOR CELL BLOCK

ELIMINATOR CELL BLOCK For A Leak-Free Design

The patented ELIMINATOR CELL BLOCK provides a unique, compact sample system approach and a flow- efficient sensor pocket machined into a solid metallic block. Precision cross-drilled intersecting gas passages eliminate the need for long lengths of tubing and leak-prone compression fittings. Additionally, a uniquely engineered 3-way selector valve (Sample/Span/Off), metering valve, and flow meter are all integrated into the ELIMINATOR CELL BLOCK. It also provides the user with direct front panel access for installing and replacing sensors, and the ability to air calibrate the analyzer, all without the need for disassembly or tools.

Image of sensor rendering exploded to show individual elements
Exploded View of Sensor

Proprietary Sensor Technology

AMI’s patented oxygen sensors deliver unmatched performance for ultra-fast response times, accuracy, and reliability. Every sensor undergoes an intense battery of tests to ensure they meet our strict quality control standards. Our trace and percent oxygen sensors operate safely, accurately, and reliably in inert or flammable gas streams even when containing high levels of H2S, up to 500 ppm H2S, for their entire warranted life. This eliminates installing a maintenance intensive H2S scrubber that competitive oxygen analyzers require!

Watchdog Front Panel
Watchdog Front Panel

Exceptional Value

The WATCHDOG is a perfect low-cost solution for O2 measurements requiring a complete sample system and limited key features. It has been designed for mounting inside a shelter of metering building in Class 1, Div. 2 areas and operates on 12-24VDC power. Its combination of advanced AMI technologies, reliability, intuitive controls and essential features make it a very cost-effective oxygen analyzer option for select applications.

Available Accessories

Watchdog Downloads