NE89 Temperature Transmitter with Digital Signal Processing (Part 3)

1. Analog Output Signal

The measurement signal is mapped to a 4 to 20 mA linear current output signal within the set range.

● Output Signal Refresh Rate

For normal temperature measurement applications, a rate at which the output signal is refreshed at least once in 1 second is sufficient; for time-critical applications, a higher refresh rate is required.

● Measurement Range and Saturation Upper/Lower Limits for Configurable Ranges

The measurement signal is mapped linearly up and down the configured range and exceeds the configured range up to the saturation limit given in NE 43 (3.8 to 20.5 mA). If the measured signal continues to be too large or too small, the output signal shall remain at the saturation current given in NE 43. Measured signals outside the measuring range of the sensor are defined as line "breaks" or "short circuits" and the output signal is switched to the alarm mode according to NE 43.

● Errors

If the temperature transmitter detects a fault in the measurement signal or if the temperature transmitter itself fails, the output signal shall output the configured alarm current within its refresh rate. After detecting a reliable measurement again, the temperature transmitter shall automatically return to normal mode. If a fault is continuously detected, the output signal shall remain in alarm mode.

2. Digital Output Signals

The measurement signals at the input of the transmitter are linearly mapped to digital output signals within the set measurement range, depending on the protocol used.

● Output Signal Refresh Rate

For normal temperature measurement applications, an output signal refresh rate of at least 1 refresh in 1 second is sufficient; for special applications, a higher refresh rate is required.

● Out of Measurement Range

A temperature signal that is outside the upper or lower limit of the sensor's measuring range is the reason why the temperature signal can no longer be mapped linearly to a digital signal. In this case, a status message based on the definition of the fieldbus protocol used must be displayed.

● Errors

If the temperature transmit ter detects a fault in the measurement signal or if the temperature transmitter itself fails, the output signal should change to the configured error mode within its refresh rate. After detecting a reliable measurement again, the temperature transmitter shall automatically return to normal mode. If a fault is continuously detected, the output signal shall remain in error mode.

3. Electrical Isolation

The temperature transmitter requires electrical isolation between the input and output circuits. The strength of the electrical isolation is expressed in at least the temperature transmitter manufacturer's declaration.

4. Software

The software used to configure the temperature transmitter shall meet the following requirements:

● The manufacturer must certify that the software has been developed and supervised in accordance with recognized quality rules.

● The manufacturer must inform about all effects of modifications to the device on functional and safety related parameters.

●Automatic hardware monitoring must be implemented in the device. Automatic monitoring should be performed on a regular or recurring basis.

●The device must automatically monitor whether the firmware is in an invalid dead loop.

●Data from automatic hardware and firmware monitoring must be logged, and the logging must include, at a minimum:

● To avoid system crashes, users must be instructed on how to handle detected faults.

● Arbitrary or unauthorized changes to parameters must be prevented. Write-protected jumpers should be provided inside the device; software write protection is not the recommended method.

● The bus connection should contain an authenticated protocol stack that can be viewed or deactivated with a password.

● The manufacturer must provide test items, test ranges, and test methods for the test equipment.

5.Microcyber MS02 Series Fieldbus Temperature Sleeve Card

● Dimensions

● Protocols and Versions

● Main Technical Indicators

6. Microcyber 's Digital Temperature Transmitter