M334
4-20 Milliamp Loop Calibrator
The Meriam M334 is a state of the art, highly reliable, rugged and easy
to use milliamp calibrator. It has the functions necessary to perform all
the required maintenance and calibration tasks of virtually any 4-20mA
loop. It provides source and read milliamp functions along with power and
measure; and two wire transmitter simulations. In addition it can measure
DC Voltage for troubleshooting power supplies.
The M334 is functionally equivalent to similar calibrators with many
additional benefits. These improvements include better long term stability,
accuracy, reliability and ruggedness including significantly improved battery
life. The combined improvements allow the Meriam M334 to meet or exceed
all of the expected performance and functions of similar products.
The M334 will also exceed the performance of many higher cost calibrators
and meet today’s most demanding requirements while maintaining the
familiar, time proven reliability and ease of use of similar calibrators. This
is the new standard!
M334 Advantages
All milliamp (mA) loop functions EZ-Check 3-position slide switch
• Source 0.00 to 24.00 mA (-25.0% to 125.0%) •Instantly output 4.00 or 20.00 mA calibration values
• Read 0.00 to 52.00 mA (-25.0% to 300.0%) • Adjustable in all 3 positions for easy valve testing
• Simulate 2-Wire Transmitters • Rugged, unbreakable with splash protection
• Power and measure 2-Wire Transmitters
Uses 4 standard “AA” alkaline batteries
Accuracy to better than 0.025% (±½ LSD) • Battery life up to 70 hours of normal usage
• Within ± 0.005 mA from 4.00 & 20.00 mA EZ-Checks • Easily accessible battery compartment
Large high contrast graphic display Overload protected
• Viewable in all lighting conditions and angles • 135 vrms Protection
• Fuse-less Protection from accidental misconnection
Read voltage function
• Read 0.00 to ± 99.99 VDC Compact, lightweight and rugged
• Small in size with heavy protective rubber boot
EZ-Dial knob
• Easily adjust output by 0.01 mA (0.01%) Rechargeable battery option available
• One hour rapid charger with four (4) NiMh Batteries
• Kit includes an AC adaptor and a car adaptor for charging on the go
36 Meriam Process Technologies www.meriam.com ph: 800.817.7849 fax: 216.281.0228
M334
4-20 Milliamp Loop Calibrator
Source/Power & Measure Additional Specifications
Two Wire Transmitters Read mA
0.00 to 24.00 mA Full Span or 0.00 to 52.00 mA Full Span OR
Ranges & Resolution -25.0 to 125.0% of 4-20 mA Ranges
-25.0 to 300.0% of 4-20 mA
Accuracy Accuracy
≤ ±0.025% of Span at 4.00 mA
EZ Check(s) at 4 & 20mA(1) Below 24.01 mA ≤ ± 0.05 % of 24.00 mA (± 0.01 mA)
& 20.00 mA (± 0.005 mA)
0.0 to 24.00 mA ≤ ± 0.05% of 24.00 mA Span (± 0.01 mA) Above 24.00 mA ≤ ± 0.05 % of 52.00 mA (± 0.02 mA)
Noise ≤ ± 0.005 mA of Reading Voltage burden ≤ 2V at 50 mA
Temperature Effect ≤ ± 0.005 % / °C of FS
Overload/Current limit protection 54 mA nominal
Loop Compliance ≥ 24 DCV @ 20.00 mA
Voltage Battery life Typical ≥ 125 Hours nominal
Loop Drive Capability 1200 Ω at 20 mA for 15 hours nominal 2-Wire Transmitter Simulation
Source and Power measure mode Accuracy Same as Source/Power & Measure
Battery Life ≥ 30 hrs at 12 mA nominal
Voltage burden ≤ 2V at 20 mA
Overload/Current limit protection 24 mA nominal
2 to 100 VDC (fuse-less protected
Loop voltage limits
from reverse polarity connections)
Battery life ≥ 125 hours nominal
Voltage Read
Range and Resolution -99.99 to +99.99 VDC Full Span (FS)
Accuracy ≤ ± 0.05 % of FS
Temperature effect ≤ ± 100 ppm/°C of FS
Input resistance ≥ 2 MΩ
Battery life > 125 hours nominal
Specifications
Operating Temperature Range -20 to 60ºC (-5 to 140ºF)
Storage Temperature Range -30 to 60ºC (-22 to 140ºF)
10% ≤RH ≤90% (0 to 35ºC), Non-condensing
Relative Humidity Range
10% ≤RH ≤70% (35 to 60ºC), Non-condensing
Size L=5.63 x W=3.00 x H=1.60 inches
Weight 12.1 ounces (including boot & batteries)
Four “AA” Alkaline 1.5V (Duracell MN1500 or equivalent)
Batteries
Optional 120 VAC 50/60 Hz AC adaptor available NiMh Rechargeable battery kit available
Low battery indication with nominal 1 hour of operation left
Miscellaneous Over-voltage protection to 135 vrms (rated for 30 seconds) or 240 vrms (rated for 15 seconds)
High contrast graphic liquid crystal display with 0.413” (10.5 mm) high digits
Electronic Handheld Calibrators 37
