Pulse Output Setup Overview
Endress+Hauser's Promag 10, Promag 50, Prowirl 72, Prowirl 73, Promass 80 series all support pulse output functionality, used to convert flow signals into standard pulse signals for acquisition by PLCs, counters, or host computers.
To correctly set up pulse output, attention must be paid to three core elements: pulse value, output frequency upper limit, and wiring method.
Key Pulse Output Parameters
Pulse Value
The pulse value represents the accumulated flow volume or mass represented by each output pulse, and is the most critical parameter in the setup.
- The smaller the pulse value, the higher the resolution, but the higher the output frequency;
- The larger the pulse value, the lower the output frequency, but the resolution decreases;
- It must be ensured that the output frequency at maximum flow does not exceed the instrument upper limit.
Output Frequency Limits
The pulse output frequency upper limits vary among different instrument models, and specifications must be checked during setup.
| Model | Typical Frequency Upper Limit | Application Scenario |
|---|---|---|
| Promag 10 | Approx. 100 Hz | Basic flow measurement |
| Promag 50 | Approx. 10 kHz | Process control |
| Prowirl 72/73 | Approx. 10 kHz | Steam and gas measurement |
| Promass 80 | Approx. 10 kHz | High-precision mass flow |
Pulse Output Setup Steps
- Enter the instrument setup menu and select the output configuration or pulse output option.
- Set the pulse value and calculate a reasonable value based on the maximum flow and frequency upper limit.
- Select the pulse polarity (active/passive) and output mode.
- Save the settings and return to the measurement interface.
- Verify whether the pulse output is normal through an external counter or PLC.
Wiring and Precautions
Wiring Points
- Passive pulse output requires external power supply; pay attention to polarity;
- Active output can directly drive the load, but the voltage level must be confirmed;
- For long-distance transmission, shielded cables are recommended to reduce interference.
Common Issues
- Pulse loss: mostly caused by too small a pulse value leading to frequency overrun;
- Counting deviation: check whether the pulse value and counter settings are consistent;
- No output: confirm that the wiring polarity and output mode configuration are correct.
Summary
When setting up pulse output for Promag 10/50, Prowirl 72/73, Promass 80, the core is to reasonably select the pulse value and ensure it does not exceed the frequency upper limit.
Combined with correct wiring and external verification, stable and reliable flow pulse signals can be ensured, meeting engineering measurement and procurement selection requirements.