A process meter is an essential tool for technicians working in industrial automation, calibration, and maintenance. Unlike a standard digital multimeter, a process meter combines measurement and source functions, making it ideal for troubleshooting and verifying sensors, transmitters, and control loops. Choosing the right model requires an understanding of features that directly impact your workflow.
π·οΈ Fluke Process Meter Deals ββββ
β‘ Key Measurement Capabilities
A process meter should cover both electrical and process signals. Important functions include:
- DC and AC voltage measurement
- Current measurement, especially 4β20 mA loops
- Resistance and continuity testing
- Frequency and duty cycle checks
These allow one instrument to handle a wide range of tasks in the field.
ποΈ Sourcing and Simulation
What makes a process meter different from a standard meter is its ability to source and simulate signals:
- Generate or simulate 4β20 mA loop current
- Source DC voltage for testing input responses
- Provide loop power (24 V) to drive transmitters
This makes the device not just a measurement tool, but also a loop calibrator.
π Accuracy and Stability
Calibration requires precision. Look for:
- High-resolution display with 0.01 mA steps
- Tight accuracy specifications (Β±0.05% or better for DC current)
- Stable output when sourcing signals
π οΈ Ruggedness and Build
Industrial environments can be tough, so durability matters. A solid process meter should include:
- Drop protection and a strong case
- Dust and moisture resistance (IP rating)
- Long battery life when sourcing
π‘ Advanced Features
Some process meters include extras that can save time:
- Data logging to track readings over time
- HART communication support for smart transmitters
- Auto step and ramp for testing responses
- Span check buttons for fast 0% and 100% loop verification
π§° Ease of Use
Look for:
- Simple, intuitive controls
- Clear backlit display
- Portable size without sacrificing features
π Fluke 787B vs 789 Comparison
Two of the most popular process meters are the Fluke 787B and Fluke 789. Hereβs how they compare:
| Feature | Fluke 787B | Fluke 789 |
|---|---|---|
| Core Function | Loop calibrator + DMM | Same, with additional process features |
| Voltage Range | Up to 1000 V AC/DC | Up to 1000 V AC/DC |
| Current Sourcing | 0β20 mA or 4β20 mA | 0β20 mA or 4β20 mA |
| Loop Power | Not included | Built-in 24 V |
| HART 250 Ξ© Resistor | Not included | Included |
| Display Features | mA and % span, step/ramp functions | Same, plus span check buttons |
| Accuracy | High accuracy for voltage and current | Similar accuracy, with enhanced functionality |
| Build | Rugged, portable, ~600 g | Same form factor |
| Safety | CAT III 1000 V, CAT IV 600 V | Same |
| Price Range | π²Check Price | π²Check Price |
β Which Should You Choose?
- Fluke 787B is the better option if you mainly need measurement and loop sourcing without requiring built-in loop power or HART features. Itβs reliable, precise, and more affordable.
- Fluke 789 is designed for technicians who frequently work with transmitters, need to power loops in the field, or deal with HART-enabled devices. It costs more, but its built-in extras make it a true all-in-one solution.
π― Final Thoughts
When selecting a process meter, focus on measurement accuracy, sourcing capabilities, durability, and usability. For most users, either the 787B or 789 will cover all process calibration needs. The decision comes down to whether built-in loop power and HART support are worth the premium.
