Manual

8
EJA / EJX Accuracy Utility
This program is designed to aid in the calibration of the Yokogawa EJA / EJX Pressure Transmitter series.
The program will calculate the maximum error based on design accuracy of the EJA / EJX and the pressure
module used when performing a calibration with the MFT.
Get HART Data
If the EJA / EJX has HART Communications, the program will automatically read all necessary
information needed to perform the calculations. If the EJA / EJX does not have HART Communications
an “EJA not found” error will be displayed. Data can be input manually into the program for non-HART
units.
EJA Model:
This data can be obtained automatically by selecting “Get HART Data” or manually input by selecting
the Chng soft key.
Pres Unit:
The pressure units can be obtained automatically by selecting “Get HART Data” or manually input by
selecting the Chng soft key.
Zero (LRV):
The Low Range Value can be obtained automatically by selecting “Get HART Data” or manually input
by selecting the Chng soft key.
Span (HRV):
The High Range Value can be obtained automatically by selecting “Get HART Data” or manually input
by selecting the Chng soft key.
Module:
Select the position of the pressure module (S1, S2, S3, or None) used for the calibration. If a module is
selected then the accuracy of the pressure module is used to determine overall error. If “None” is
selected then the design accuracy of the EJA / EJX is calculated. If no pressure module is installed,
“n/a” is displayed and the design accuracy of the EJA / EJX is calculated.
Calculate
Calculates data and goes to the results screen. If a pressure module was selected, the message
“Accuracy is dependent on the span of the pressure module used” is displayed for 3 seconds.
Accuracy %
This is the maximum error of the calibration of the EJA / EJX in % of span. If a pressure module was
selected, then the accuracy of the pressure module is included in the calculation to determine overall
error. If “None” is selected then the design accuracy of the EJA / EJX is used to calculate the overall
error.
Accuracy mA
This is the maximum error of the calibration of the unit in mA. If a pressure module was selected then
the accuracy of the pressure module is included in the calculation to determine overall error. If “None” is
selected then the design accuracy of the EJA / EJX is used to calculate the overall error.
Min Span
Displays the minimum span of the EJA / EJX unit.
Max Span
Displays the maximum span of the EJA / EJX unit.
LRL
Displays the lower Range Limit of the EJA / EJX unit.
URL
Displays the upper Range Limit of the EJA / EJX unit.