Yokogawa EJX440A - Manual (Page 14)

<3. Operation>
3-4
IM 01C25T01-01E
3.2 Parameter Usage and
Selection
Before setting a parameter, please see the following
table for a summary of how and when each
parameter is used.
Table 3.2.1 Parameter Usage and Selection
Item
HART
communicator
Description Page
Memory Tag Tag number, up to 8 characters P.3-8
Descriptor Up to 16 characters P.3-8
Message Up to 32 characters P.3-8
Date xx/yy/zz P.3-8
Transmitter Unit Unit Sets a pressure unit for the measured pressure P.3-8
Range LRV/URV Sets the calibration range by the keypad P.3-9
Apply values Range for 4 to 20 mA DC signal is set with actual input applied P.3-10
Output mode Xfer fnctn Sets mode for output signal to “linear mode” (proportional to
input differential pressure) or to “Square root mode” (proportional
to flow)
P.3-10
Damping time
constant
Pres Damp Adjust the output response speed for the input pressure of
differential pressure
P.3-11
Output signal low cut
mode
Low Cut Used mainly to stabilize output near 0 if output signal is the
square root mode. Two modes are available: forcing output to
0% for input below a specific value, or changing to proportional
output for input below a specific value
P.3-11
Low cut mode Linear or Zero P.3-11
Bi-directional flow
measurement mode
Bi-dir mode Used to measure bi-directional flows P.3-12
Unit for displayed
temperature
Temp Unit Sets a temperature unit displayed on HART communicator P.3-15
Unit for displayed
static pressure
SP Unit Sets a pressure unit for the static pressure displayed on HART
communicator
P.3-16
Impulse line
connection
orientation
H/L Swap Used where installation conditions make it imperative to
connect high pressure side impulse line to low pressure side of
transmitter
P.3-12
Display Integral indicator
display mode
Disp Pres % fnctn Sets mode for integral indicator to “linear mode” (proportional to
input differential pressure) or to “Square root mode” (proportional
to flow)
P.3-13
Disp select Sets the following 5 types of integral indicator scale ranges
and unit: input pressure, % of range, user set scale, input static
pressure, % of static pressure range, and alternating among any
four of the above
P.3-14
Integral indicator
scale
Engr disp range Sets Engr Unit/Modify Engr Unit/Engr LRV/Engr URV/Engr
point/Engr exp
P.3-13
Burst mode Burst option Selection of the data to be sent continuously (PV, % range/
current, or Process vars/crnt)
P.3-22
Burst mode ON/OFF switching of burst mode P.3-22
Process alarm Process Alerts Used for alarm generation on the integral indicator P.3-27
HART output Multidrop mode Poll addr Sets the polling address (1 to 15) P.3-22
Polling ON/OFF switching of multidrop mode P.3-23
IMPORTANT
After setting and sending data with the HART
communicator, wait 30 seconds before turning
off the transmitter. If it is turned off too soon, the
settings will not be stored in the transmitter.