Dynisco UPR900 Manuale di applicazione e configurazione - Pagina 4

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Strain Gauge Semi‐Automatic Calibration 

If enabled, the semi‐automatic calibration uses a resistor present within the pressure transducer, to calibrate the instrument 

to the transducer. The resistor is used to force the mV output from transducer to a fixed percentage of the full scale value 

when the calibration relay shorts out the R‐CAL connections. Strain Gauge Calibration is a sub‐menu option in Input 

Configuration, but can also be accessed at any time by pressing DOWN and FORWARD simultaneously. Allow time for the 

instrument and process to reach operating temperature before starting. The first strain gauge input is calibrated then the 

second if it is fitted and configured. 

1. Select the Shunt Resistor as Enabled. If enabled the semi‐automatic calibration procedure is used. If it is disabled, use 

the Manual calibration instructions below. 

2. Set the Calibration Resistor value (default = 80% of sensor maximum). The instrument must know what percentage will 

be applied to calibrate correctly – Check sensor datasheet. 

3. At the Low Point Calibration screen, ensure the transducer is at working temperature with zero pressure applied, then 

press UP and DOWN simultaneously. Low end calibration is performed and a completed message shown. The error 

message "Count Failure" is shown if the input was not ±10mV of the nominal 0mV expected signal, and calibration is not 

altered. This could signify a faulty transducer. You can only move onto high end calibration once the problem is 

corrected and low calibration has been completed successfully! 

4. At the High Point Calibration screen, press UP and DOWN simultaneously. The calibration relay turns ON to short the R‐

CAL terminals together and force required %mV value to be output from transducer into the instruments input. High 

end calibration is performed and a completed message shown. The error message "R Cal Failure" is shown if the signal 

was less than +20mV or greater than +50mV, and calibration is not altered. This could signify a faulty transducer R‐Cal 

resistor. Repeat the calibration procedure once the problem is corrected. 

5. The procedure from 1 to 4 is repeated if a 2

Strain Gauge Manual Calibration 

If the shunt is disabled, a Manual Calibration needs to be performed by user. Manual Calibration requires the user to input 

known Zero Offset and Full Scale mV values into the input terminals of the instrument using an accurate mV calibration 

source. 

The Manual Calibration process for the low offset is as follows:  

1. Ensure Unit is powered on and mV Input from the calibration signal source is wired to the instrument's strain gauge 

input terminals. 

2. Enter the Strain Gauge Calibration mode, (e.g. press DOWN and FORWARD simultaneously). 

3. Select the Shunt Resistor as Disabled. 

4. The Calibration Resistor percentage value is fixed to 100.0% and cannot be changed by the user. 

5. At the Low Point Calibration screen, check that the calibration signal is set to exactly the transducer mV signal at zero 

pressure, then press UP and DOWN simultaneously. Low end calibration is performed and a completed message shown. 

The error message "Count Failure" is shown if the input was not ±10mV of the nominal 0mV expected signal, and 

calibration is not altered. Check your signal and repeat the calibration process from the start. You can only move onto 

high end calibration once low calibration has been completed successfully! 

6. At the High Point Calibration screen, check that the calibration signal is set to the full scale mV signal as per the 

transducer datasheets (e.g. 33.3mV), then press UP and DOWN simultaneously. High end calibration is performed and a 

completed message shown. The error message "R Cal Failure" is shown and calibration is not altered if the signal was 

less than +20mV or greater than +50mV OR the High Cal – Low Cal value is less than 10mV. Check your signal and 

repeat the calibration process from the start. 

 strain gauge input is configured. 