MicroKnowz™ is a series of compact, intelligent combustible gas sensing modules specifically designed for safety applications in fuel cells and gas-burning power generators.

These devices are virtually identical to MiniKnowz™ modules except that MicroKnowz™ is provided standard in a robust anodized aluminum enclosure.

MicroKnowz™ Feature:

• MOS (tin dioxide) sensor
• HCMOS microcontroller
• Hydrogen, methane, & propane versions
• 0-50% LEL measurement
• 200/400 ppm logical resolution (propane / methane & hydrogen)
• 30 seconds start-up time
• 4 secs. T90 response time
• 10 secs. T10 recovery time
• Normal, Warning, Alarm & Error states
• Table look-up (software) linearization
• Optional 0-to-5V proportional output (6 bit)
• Optional 0-to-5V state step output (2 bit)
• Optional binary operation (TTL output)
• PK-Port™ compatible digital communications
• User-settable alarm/warning via PK-Port™
• Digital FLASH-based calibration
• Each device factory pre-calibrated
• Field re-programmable firmware
• -40 to +80 Celsius active compensation
• Sensor & temperature error detection
• 33 x 23 x 29 mm aluminum case with 9mm flanges
• 5VDC @ 80mA (400 mW) operation (Option "I1")
• Optional 7-40VDC input power version (Option "I2")
• Optional 7-60VDC input power version (Option "I3")

MicroKnowz™ Details:Warning & Alarm Levels
·  Alarm & warning PPMs specified at order time
·  Alarm level from 10-75% of reading range
·  Warning level/action is optional
·  Warning level from 20-80% of alarm level
·  Levels are field-adjustable via PK-Port™

State Indications·  Normal, warning, alarm & error state
·  Errors-as-Alarms for fail safe operation
·  Live monitoring & data logging via PK-Port

Reliability Features·  Optional alarm-producing errors
·  Sensor failure & disconnection detection
·  Overdose/saturation damage detection
·  Temperature out-of-bounds detection
·  Digital calibration values delimited
·  Low supply voltage inhibit
·  Power fail detect via signal offset loss
·  Watchdog timer & software checksums

Environmental Requirements·  Diffusion sampling
·  3 meters/second flow rate maximum
·  10% minimum atmospheric oxygen
·  10% to 95% R.H. (non-condensing) oper.
·  0.8 to 1.2 Atmosphere operating pressure

 Calibration·  All devices individually calibrated
·  FLASH-based cal. accessible via PK-Port
·  Do not use desiccated (0% R.H.) cal gas
·  Six month recalib. schedule recommended
·  Periodic factory recertification avail.

Incompatible Uses·  Not for use in anaerobic environments
·  No dusty or corrosive environments
·  No condensing moisture
·  Not for use with desiccated calibration gas
·  No butane gas bump-testing
·  Adversely affected by silicone vapors
·  Very high gas levels may damage sensor

PK-Port Interface·  Access via interface connector pin
·  PC (serial) interface module extra
·  Real-time monitoring and data-logging
·  Access/modify config. & cal. values

Mechanical·  Enclosure size: 33 x 23 x 29 mm
·  Flanges: 9mm wide with 4mm holes
·  Weight: 15 g