Parameters
Parameter Category Specification for DM1A-100G
Model Number DM1A-100G
Product Name Digital Manual Loader (Portable Process Calibrator)
Primary Functions • MEASURE: DC Current (mA), DC Voltage (V)
• SIMULATE (SOURCE): DC Current (mA), DC Voltage (V)
• Loop Power: Can provide a 24V DC power supply for 2-wire transmitters during testing.
Measurement Ranges • DC Current: 0 to ±100.00 mA (resolution 0.01 mA)
• DC Voltage: 0 to ±100.00 V (resolution 0.01 V)
Simulation (Output) Ranges • DC Current: 0.00 to 100.00 mA (adjustable, resolution 0.01 mA)
• DC Voltage: 0.00 to 100.00 V (adjustable, resolution 0.01 V)
Accuracy • Typical Accuracy: ±0.05% of reading ±1 digit (for both voltage and current functions). This is high accuracy suitable for calibration work.
Loop Power Supply • Function: Supplies 24V DC to power a 2-wire (4-20mA) transmitter during test and simulation, isolating it from the control system.
• Compliance Voltage: Sufficient to drive typical loop loads.
Display • Type: 4-digit, 7-segment LCD display
• Units: Shows mA or V value clearly.
Battery • Type: Standard 9V battery (e.g., 6F22/PP3)
• Life: Approximately 80 hours of continuous use.
Operating Conditions • Temperature: 0 to 50 °C (32 to 122 °F)
• Humidity: 5 to 95% RH (non-condensing)
Safety Rating Not rated for use in hazardous (explosive) atmospheres. For safe use in such areas, a intrinsically safe (IS) barrier or a calibrator rated for Hazardous Areas is required.
Connections • Terminals: 4 safety banana jack terminals (INPUT, OUTPUT, SENSOR, EXT. PWR).
• Leads: Typically supplied with a set of test leads and alligator clips.
Dimensions / Weight Compact, handheld device. Lightweight (approx. 200-300g including battery).
Key Features and Applications
High Accuracy: The ±0.05% accuracy makes it a true calibration-grade instrument, ensuring process instruments are set up correctly.

Versatility: Combines both voltage and current measurement/generation in one tool, covering the vast majority of analog loop testing scenarios.

Loop Power Function: This is a critical feature. It allows a technician to disconnect a 2-wire transmitter from the loop, power it independently, and inject a simulated process variable to check its output. This isolates faults to either the transmitter or the control system.

Ease of Use: The simple four-terminal design (Input, Output, Sensor, Ext Pwr) makes wiring for different tasks (measure, simulate, power) intuitive.

Portable & Robust: Designed for daily use in industrial environments.

Primary Applications:

Calibration: Checking and adjusting the scaling of pressure, temperature, flow, and level transmitters.

Troubleshooting: Diagnosing faulty I/O cards on PLCs/DCS, verifying control valve movement, and finding wiring problems.

Commissioning: Testing loop integrity and instrument response during plant startup.

Maintenance: Periodic verification of loop performance.