Parameters
Parameter Category Specification for T-DM1A-045G
Model Number T-DM1A-045G
Product Name Digital Manual Loader (Portable Process Calibrator)
Primary Functions • MEASURE: DC Current (mA), DC Voltage (V), Resistance (Ω)
• SIMULATE (SOURCE): DC Current (mA), DC Voltage (V), Resistance (Ω)
• Loop Power: Provides a 24V DC power supply for 2-wire transmitters.
Measurement Ranges • DC Current: 0 to ±100.00 mA (resolution 0.01 mA)
• DC Voltage: 0 to ±100.00 V (resolution 0.01 V)
• Resistance: 0 to 400.0 Ω (resolution 0.1 Ω) - This range is ideal for common Pt100 RTDs.
Simulation (Output) Ranges • DC Current: 0.00 to 100.00 mA (resolution 0.01 mA)
• DC Voltage: 0.00 to 100.00 V (resolution 0.01 V)
• Resistance: 0.0 to 400.0 Ω (resolution 0.1 Ω) - Can simulate an RTD's resistance output.
Accuracy • Current/Voltage: Typically ±0.05% of reading ±1 digit
• Resistance: Typically ±0.1% of reading ±1 digit (for the resistance function)
Loop Power Supply • Function: Supplies 24V DC to power a 2-wire (4-20mA) transmitter during testing.
• Compliance Voltage: Sufficient to drive typical loop loads.
Display • Type: 4-digit, 7-segment LCD display
• Units: Shows mA, V, or Ω value.
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, an intrinsically safe (IS) barrier is required.
Connections • Terminals: 4 safety banana jack terminals (INPUT, OUTPUT, SENSOR, EXT. PWR).
• Leads: Typically supplied with a set of test leads.
Dimensions / Weight Compact, handheld device. Lightweight (approx. 200-300g including battery).
Key Features and Applications
RTD Specialist: The resistance measurement and simulation capability is the key feature of this model. It can directly read the resistance of an RTD to verify its health, or simulate an RTD's resistance value to test a temperature transmitter, controller, or indicator.

High Accuracy: Provides calibration-grade accuracy for ensuring instruments are within specification.

Versatility: Covers the three most common analog signal types: current, voltage, and resistance.

Loop Power: Allows for testing 2-wire transmitters independently from the control system, which is essential for fault isolation.

Portable & Durable: Designed for daily use in industrial plant environments.

Primary Applications:

Calibrating Temperature Transmitters: Simulating an RTD input to check the 4-20mA output of a temperature transmitter.

Testing RTD Sensors: Measuring the resistance of an RTD directly to verify its accuracy and check for failure (shorts or opens).

Troubleshooting Temperature Loops: Diagnosing faults in loops involving RTDs, transmitters, controllers, and recorders.

General Purpose Loop Maintenance: All standard 4-20mA and voltage loop testing, similar to other DM1A models.