Rice Lake MSI-9850 CellScale RF Digital Indicator - Operator Manual - Manual (Page 91)

MSI CellScale ® System • 9850 User Guide Page 91
MEASUREMENT SYSTEMS INTERNATIONAL
Firmware Version 5-XX for 2450 Modems
CALIBRATE GENERAL INFORMATION
The following sections are intended for qualified scale technicians. The CellScale can be calibrated either directly
using the Terminal Interface mode, or by using a 9850 or 3750CS. See the CellScale operators guide for informa-
tion on direct calibration. This section details the calibration of a CellScale using the 9850 RF Remote Indicator.
Calibrating a CellScale with a 9850 requires that adequate test weights (at least 10% of capacity) are available.
The CellScale is capable of multi-point calibration with any combination of weights from zero to capacity.
Calibration constants are stored only in the CellScale. The 9850 serves only as a controller during calibration. Since a single CellScale is capable of hosting up to
32 independent scales, the scale channel to be calibrated must be selected first using the CHANNEL Key. To Calibrate multiple Scale Inputs, you must complete
the first calibration. Then exit out of the Calibration Menus. Select the next scale with the CHANNEL Key. Then enable Calibration again.
ENABLE CALIBRATION
Calibration of a CellScale from the 9850 may be protected in either of two ways: 1) Legal-for-Trade systems are
protected with a sealed push button switch on the CellScale. This switch must be pressed to enable the calibra-
tion menus. 2) The 9850 also offers password locks to prevent calibration. See the Password locks section for
information on how to set passwords.
Industrial use scales are not required to have the calibration protected. However MSI recommends using the
Password locks to prevent accidental calibrations.
To Enable Calibration (Legal-for-Trade CellScales Only)
1) Expose the Calibration Seal Port by removing the seal screw on the CellScale with a Phillips Head Screw-
driver. Seal Screw location can be found in the CellScale manual or the 9300 Crane Scale Manual.
2) Insert a small non-metallic screwdriver or the wooden stem of a “Q-Tip” and press and release the switch
button in the hole. The CellScale will acknowledge the press button by flashing its LEDs.
3) Now you can proceed with calibration and calibration settings.
TO CALIBRATE
Use this Calibration procedure for calibration of the CellScale using the 9850. The CellScale supports 10 point
calibration - zero and up to 9 points of span calibration. Zero and at least 1 span point are required for a successful
calibration. The highest value test weight should be at least 10% of capacity, but 50% or more is preferable.
Calibration Procedure
1) Multichannel systems only - Using the CHANNEL key, step to the Scale channel you wish to calibrate.
Only A/D channels can be calibrated (1-x, 2-x, 3-x, and 4-x). Do not attempt to calibrate a math channel
(6-x).
2) Press SETUP followed by CHANNEL , or SETUP , “MORE” [7] , and select “Channel / Calibration”
[1] .
3) Select “Start Calibration” [4] .
4) If this is a re calibration, press ENTER and jump to step 9. If this is a new installation, or you wish to
change the capacity and/or scale division size, press CLR ( ZERO ).
5) The screen displays “RESETTING CALIBRATION” a few seconds while the calibration memory is
purged.
6) Select a calibration unit by pressing 1 - 7 . This should be in the units the scale is most commonly used in.
However, sometimes it is desirable to use the units your test weights are cal’d in for convenience in number
entry. You can always change the units for display later.
7) Enter the capacity of the scale (in the cal unit selected) using the numeric keypad. Press ENTER .
8) The CellScale calculates the appropriate scale divisions based on allowed resolution and then sends them
to the 9850 as a list. The “SCALE DIVISIONS (d)” menu will vary depending on capacity and units. From
5 to 12 possible divisions will be shown. Pick the rated scale division for your scale.
Avoid excess total divisions (capacity/d = total divisions) for the type of scale you are using. Crane scales should be less than 5000 total divisions and
depending on usage sometimes less than 1000 divisions. Platform scales are rarely accurate above 10000 divisions. Lower resolution means faster settling
time, and a more stable display in vibration and motion situations.
9) “ZERO CALIBRATION” – Unload the scale. When the scale is stable press ENTER . There will be a short
delay while the A/D in the CellScale performs all its initializations.
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