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The Meriam M334 loop calibrator is a state of the art, highly reliable, rugged and easy to use milliamp loop calibrator. The M334 performs the functions necessary to perform all the required maintenance and calibration tasks of process loops. It provides source and measurement of milliamps. It will also power and measure a two wire transmitter simulations. Of course it will also measure DC Voltage for troubleshooting loop power supplies.
Let's face facts, the loop calibrator market is crowded. The Meriam M334 is equal to similar calibrators with many added features. These features include better long term stability, accuracy, reliability and ruggedness. A significantly improved battery life is also designed into the unit. The combined improvements allow the Meriam M-334 to meet or exceed all of the expected performance and functions of similar products.
Operating Temperature Range | -20 to 60ºC (-5 to 140ºF) |
Storage Temperature Range | -30 to 60ºC (-22 to 140ºF) |
Relative Humidity Range | 10% ≤RH ≤90% (0 to 35ºC), Non-condensing 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) |
Batteries | Four “AA” Alkaline 1.5V (Duracell MN1500 or equivalent) Optional 120 VAC 50/60 Hz AC adaptor available NiMh Rechargeable battery kit available |
Miscellaneous | Low battery indication with nominal 1 hour of operation left 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 |
Source/Power & Measure Two Wire Transmitters
Ranges & Resolution | 0.00 to 24.00 mA Full Span or -25.0 to 125.0% of 4-20 mA |
Accuracy | |
EZ Check(s) at 4 & 20mA(1) | ≤ ±0.025% of Span at 4.00 mA & 20.00 mA (± 0.005 mA) |
0.0 to 24.00 mA | ≤ ± 0.05% of 24.00 mA Span (± 0.01 mA) |
Noise | ≤ ± 0.005 mA of Reading |
Temperature Effect | ≤ ± 0.005 % / °C of FS |
Loop Compliance Voltage | ≥ 24 DCV @ 20.00 mA |
Loop Drive Capability | 1200 Ω at 20 mA for 15 hours nominal |
Battery Life | Source and Power measure mode ≥ 30 hrs at 12 mA nominal |
Additional Specifications
Read mA | |
Ranges | 0.00 to 52.00 mA Full Span OR -25.0 to 300.0% of 4-20 mA |
Accuracy Below 24.01 mA Above 24.00 mA | ≤ ± 0.05 % of 24.00 mA (± 0.01 mA) ≤ ± 0.05 % of 52.00 mA (± 0.02 mA) |
Voltage burden | ≤ 2V at 50 mA |
Overload/Current limit protection | 54 mA nominal |
Battery life | Typical ≥ 125 Hours nominal |
2-Wire Transmitter Simulation | |
Accuracy | Same as Source/Power & Measure |
Voltage burden | ≤ 2V at 20 mA |
Overload/Current limit protection | 24 mA nominal |
Loop voltage limits | 2 to 100 VDC (fuse-less protected 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 |