M202
Meriam’s model M202 Precision Absolute Manometer brings calibration bench accuracy to a portable, handheld unit. This combination of accuracy and fluid compatibility makes the M202 ideal for environmental, test or real-time process measurements of pressure relative to absolute zero. General Purpose (G.P.) and Intrinsically Safe (I.S.) models are available.
The M202 includes features for minimum and maximum (Min/Max) value capture, tare readings and user selectable engineering units. A selectable altitude function allows users to enter site altitude above sea level in order to display local barometric pressure or barometric pressure corrected to sea level. User referenced altitude (referenced to map or trig markers) or altitude based on US Standard Atmosphere of 1962 can be selected for display. Using the altitude function with the Min/Max and Tare features makes the M202 very useful as a surveyor’s tool to accurately measure changes in altitude.
AI0017: + 0.02% FS, Intrinsically Safe (cULus and ATEX)
AI0038: + 0.015% FS from 0 to 19.337 PSIA (0 to 1000.0 mm Hg Absolute; + 0.025% FS from 0 to 38.674 PSIA (0 to 2000.0 mm Hg Absolute), Intrinsically Safe (cULus and ATEX)
This product is an updated version of the 355.
Features
Approvals – CE compliant, Optional Intrinsically safe per ATEX and cULus
Display – 5 significant digit LCD (0.25” high) 2 line x 16 alphanumeric characters
NIST Traceability – NIST certificate supplied for all models
Power – 4 AA alkaline batteries with user enabled automatic shut-off
Temperature Specifications –
Storage: -40° F to 140° F (-40° C to 60° C)
Operating: 23° F to 122° F (-5° C to 50° C)
Process Connections – 1⁄8” female NPT, 316SS
Enclosure – 14 ounce (6.5” X 3.6” X 2.25”) ABS plastic case
Media Compatibility – Isolated AI sensor for fluids compatible with 316SS
Pressure Limits – 77 PSIA (4,000 mm Hg Abs) for both AI0017 and AI0038
Tare – Nulls applied pressure to allow measurement of vacuum, gauge pressure or change in pressure or altitude from a reference point
Min/Max Capture – capture speed is equal to the selected damping rate
Damping Rates – user selectable from 0.1 to 25 seconds
Backlight – Green; changes to Red for over pressure
Engineering Unit Selection – mm Hg, PSI, in. Hg, mbar, bar, kPa, Torr, feet, meters
Altitude – displayed in feet or meters. Can be set by user based on map or trig marker information or standard altitude uses U.S. Standard Atmosphere of 1962 data
Contrast Adjustment – adjusts display for best viewing
Accuracy –
M202-AI0017 (FS = 17.403 PSIA or 900 mm Hg Abs.) ±0.02% F.S.
M202-AI0038 (FS = 38.674 PSIA or 2,000 mm Hg Abs.)
±0.015% F.S. from 0 – 19.337 PSIA (0-1,000 mm HgA)
±0.025% F.S. from 19.338 – 38.674 PSIA (0-1,000 –
2,000 mm Hg Abs.)
Field recalibration – supported through firmware feature