OHAUS T72XW AM, Instruction Manual

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EN 22 7000 SERIES INDICATORS
Automatic Zero Maintenance
Automatic Zero Maintenance (AZM) enables the T72XW to compensate for the build up of small amounts of weight
and track itself back to the center of zero. Within the AZM operating range (selectable from 0.5, 1, 3 or 10
divisions), when the indicator is in a no motion condition, it makes small adjustments to the current zero reading to
drive the weight reading toward the true center-of-zero. When the weight is outside of the programmed AZM range,
this feature is not functional.
Power Up Zero
Power-Up Zero enables the T72XW indicator to capture a new zero reference point after power is applied. If there
is motion during a power-up zero capture function, the indicator will continue to check for a no-motion condition
until zero is captured.
Power-up zero can be disabled or enabled, and a range above and below calibrated zero can be configured. The
range is programmable from 0% to 100% of capacity and can include a positive range and also a range below
calibrated zero.
Pushbutton Zero
The pushbutton (semi-automatic) zero function can be accomplished by pressing the ZERO key , by
programming a discrete input or by issuing a serial command.
The range for all types of semi-automatic zero is selectable (Disabled, 2% or 20%) plus or minus from the
calibrated zero point.
Remote initiation of the semi-
automatic Zero command is possible via a discrete input, or an ASCII ‘Z’ command
sent serially (CPTZ and SICS interface modes)
.
2.4.2 Tare
Tare is the weight of an empty container. A tare value subtracts from the gross weight measurement, providing the
computation of the net weight (material without the container). The tare function can also be used to track the net
amount of material being added to or removed from a vessel or container. In this second case, the weight of the
material in the container is included with the tare weight of the container and the display then reflects the net
amount being added to or removed from the vessel.
Tare operations in the T72XW include:

Pushbutton Tare

Keyboard (Preset) Tare

Tare Clear

Manual Clear

Auto Clear

Net Sign Correction

Automatic Tare
Pushbutton Tare
Pushbutton tare can be configured in setup as enabled or disabled. When disabled, pressing the TARE key
has no effect.
If pushbutton tare is enabled, pressing the pushbutton TARE key initiates a semi-automatic tare. The
T72XW will attempt to perform a tare process. If the process is successful, the display changes to a zero net weight
indication and the previous weight on the scale is stored as the tare value. The net mode will be indicated on the
display.
Several conditions could inhibit the pushbutton tare function:
Motion
– Pushbutton tare cannot be taken when the scale is in motion. If motion is detected when a pushbutton
tare command is received, the T72XW will wait for a programmed amount of time (the default value is 3
seconds) for a no-motion condition. If a stable (no motion) weight condition occurs before the timeout expires,
the pushbutton tare command is executed.
If there is still motion at the end of the timeout, the command is aborted.
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