Overview of T-mass 65 Pulse Output Setup

T-mass 65 is a thermal mass flowmeter under Endress+Hauser, widely used for gas flow measurement. Its pulse output function can convert flow signals into frequency signals, making it convenient to connect with external counters or PLCs. Correctly setting the pulse output is crucial to ensuring measurement accuracy.

T-mass 65 pulse output setup interface

Pulse Output Setup Steps

1. Enter the Output Setup Menu

Enter the Setup → Output → Pulse Output menu through the local display or commissioning software. Ensure the device is in Expert mode or Service mode; otherwise, some parameters will not be visible.

2. Configure Pulse Output Parameters

Set the following parameters according to actual requirements:

  • Pulse equivalent: the flow value represented by each pulse, for example, 1 pulse = 0.1 kg.
  • Pulse width: the duration of the pulse, usually 0.5 ms to 100 ms, and it must match the external counter.
  • Output mode: select forward flow, reverse flow, or bidirectional flow.
  • Maximum frequency: set according to the upper flow limit to avoid pulse loss.

After completing parameter setup, save and exit.

Pulse output parameter configuration interface

3. Wiring and Testing

Connect the pulse output terminals to the external device, paying attention to polarity. Use an oscilloscope or frequency meter to monitor the output signal and confirm that the pulse frequency is proportional to the flow. If the signal is abnormal, check the wiring and parameter settings.

Pulse output wiring diagram

Recommended Pulse Output Parameter Values

The following are reference parameters for common application scenarios, and they need to be adjusted according to the flow range and external device in practice.

Application Scenario Pulse Equivalent Pulse Width Maximum Frequency
Low flow measurement 0.01 kg 1 ms 5 kHz
General industrial 0.1 kg 0.5 ms 10 kHz
High flow monitoring 1 kg 0.2 ms 20 kHz

Precautions and Common Issues

  • If the pulse equivalent is too small, the frequency will become too high and exceed the output capability.
  • The pulse width must be greater than the minimum response time of the external device.
  • Ensure that the maximum frequency is higher than the frequency corresponding to the actual maximum flow.
  • If the pulse output is unstable, check whether the power supply and grounding are good.
  • After modifying parameters, the flowmeter must be recalibrated.

By following the above steps, the T-mass 65 pulse output setup can be completed efficiently, improving system integration and measurement accuracy.