PT610, PT620, PT630
Instruction Manual
23
5.2.1 Zeroing
Zeroing is performed to compensate for deviations from zero of the unloaded scale. Sometimes there
can be some small build up of material or drifting out of the automatic zero band.
•
Clean the unloaded platform and check if there is anything touching the platform.
•
Press the
<ZERO>
(
→
0
←)
key to compensate for the zero deviation. Zeroing can be performed
if the scale is stable and within the zero setting range.
•
The
>0<
sign appears to indicate that zeroing is complete and the scale is at center of zero.
•
If zeroing is has not succeeded, wait for the
~
sign disappear and press the
<ZERO>
key again.
The indicator can track small changes in the zero point to keep a zero indication for an empty scale,
refer to Zero Tracking parameters**.
The indicator can perform automatic zeroing at power-on where the Zero point is corrected
automatically at power-on of the instrument to compensate for zero drifts of the scale if the
scale is always empty (unloaded) at power-on. This feature should be disabled for tank, silo, hopper
scales etc. where they may not be empty.
Power on zero has a limited range set in the parameters** and the instrument announces
[POWER ON
ZERO ERR]
error if outside this range.
Press the
<ESC>
key to start indication without zeroing and call service. If the range is more than 3%,
the residual drift cannot be displayed. Refer to Power on Zero parameter**.
5.2.2 Taring
Taring is performed to deduct the initial weight of a container and its contents and to just display the net
weight added into the container or unloaded from the container. The PT610, PT620 and PT630 are
programmable for various types of tare function: Single tare, Multi-tare, Tare Clear, auto-Tare, auto
Clear, preset Tare. The current tare value can be set to save and restore after power on. The actual
functioning depends upon parameter settings, see (6.3.3, 6.3.3.1).
Warning:
The tare value cannot exceed the maximum scale capacity. The maximum amount that can
be weighed in NET mode is the difference between the tare weight and the maximum scale capacity.
Capacity in Net = Maximum scale capacity – Tare weight.
5.2.2.1 Taring, Multi-taring
•
Place the container on the platform and press the
<TARE>
key.
•
The display value is zeroed and the
NET
(net weight) symbol appears.
•
Place the material in to the container and read the net weight of the material you added.
◦
Alternatively you can place a container of material on to the scale and press
<TARE>
as
above. You can remove material from the container and the scale shows how much
material has been taken out.
•
The tare value is used until the tare is cleared or if multi-taring is active a new tare is set by
pressing the
<TARE>
key again.
5.2.2.2 Clear Tare
•
Remove the container so the scale is empty and press the
<CLEAR>
key.
•
The display is zeroed and the
NET
annunciator disappears and the
B/G
(gross weight) symbol
appears.
5.2.2.3 Auto Tare
If auto tare** is set, the scale will automatically tare the weight of a container placed on an empty scale
if the gross load is greater than the MIN TARE** setting. The
NET
annunciator appears.
5.2.2.4 Auto Clear Tare
If auto clear** is set, the tare value will be cleared when the weight is removed from the scale in NET
mode and the gross load reduces below 10 divisions. The
NET
annunciator disappears and the
B/G
(gross weight) symbol appears.
5.2.2.5 Restore Tare
Usually the tare is cleared when the power is turned off. If Restore Tare at power on is set** then the
tare is saved at power off and restored with the indicator in
NET
mode at power on.
5.2.2.6 Preset Tare
For PT620 and PT630.
Preset tare is a mode of taring set in the parameters** where the tare weight of the container is keyed
into the indicator instead of pressing the
<TARE>
key with a container on the scale. This is useful when
you need to weigh the contents of a container that is already full and subtract the weight of the
container.
•
Place the container with the contents on the platform and press the
<PT>
key for 2 seconds or