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However it should be kept in mind that for any battery powered applications, using a value
lower than the default will decrease battery life.
5.10.5 Analogue Output Adjustment
The analogue output may be adjusted/trimmed at this level of the program; this should not
be necessary in most applications as the analogue output is factory calibrated, however it may
be useful when operating at extreme ambient temperatures.
There are two parameters which the user can set; the 4mA adjustment and the 20mA
adjustment. With the 4mA adjustment showing on the instrument display the unit will output
4mA to the receiving instrument, likewise with the 20mA adjustment showing on the display
the unit will output 20mA. By noting the difference in the receiving instrument’s reading in mA
the user can correct any errors.
The display allows entry of the adjustment in 0.001mA steps, and adjustments may be made
in the positive or negative direction. The default adjustment direction is positive, however
this can be changed by holding the ‘UP arrow’ key for 3 seconds.
5.10.6 Backlight Override
The backlight is automatically enabled whenever external DC power is connected to the
instrument; this feature may be over-ridden in this level of the program. The backlight
override may be set to ‘ON’ (normal function), ‘OFF’ (always off), or ‘INT’ (intermittent, the
backlight will be on for 30 seconds following a button press). Note that ‘INT’ operation still
requires external DC power.
5.10.7 Tag Number Entry
The user may enter an identifying tag number into the instrument, according to the P&ID of
the installation where it is used. The default tag number is FIT-000 allowing quick entry of a
simple ISA-5.1 standard Tag Number, however this can be expanded up to 12 digits of
alphanumerical characters and hyphens (e.g. FIT-123-45AB). The leading 3 digits (FIT;
describing the device as a Flow Indictor/Transmitter) may also be changed to any
alphanumeric character to suit the user’s requirements.
Once a tag number is entered it is viewed during the operating mode by pressing and holding
the PROG/ENTER key; when the tag number contains more than 8 digits it will scroll across the
LCD.
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General