KERN & SOHN FA 6T-3M - Manual (Page 77)

Annex page 1 of 7
Annex to Test Certificate No. DK0199-R76-11.04
Issued by DELTA
1. Name and type of instrument
The indicators KFN-TM / KFB-TM are a family of weighing indicators suitable to be incorporated in
non-automatic weighing instruments, class III or class IIII, with single-interval, multi-interval or
multi-range.
2. Description of the construction and function
2.1 Construction
The electronic indicator consists of a single circuit board, SMD populated on both sides as the A/D-
interface circuits, the microprocessor and the voltage regulation are placed on one side and the LCD
display on the other side.
The LCD-display has indication for: Stable, zero, gross, net, tare, and weight unit (kg, g, t), and 5½
digits with a height of 52 mm.
The enclosure is made of stainless steel for the KFN-TM indicator or of ABS plastics for KFB-TM.
The front of the enclosure has an on/off key plus 6 keys for operating the functions of the indicator.
All instrument calibration and metrological setup data are stored in the non-volatile memory.
The indicators are power supplied with 9 - 12 VDC - normally supplied by external 230 VAC to
9 - 12 VDC adapter. An optional internal battery can be factory installed.
As part of the indicators EMC protection ferrites shall be placed as follows:
• Externally around the DC supply cable near its connection to the indicator (min. 1 turn).
• Internal on cable between power plug and main board (4 turns).
• Internal on cable between load cell connector and main board (min. 2 turns).
Software
The software version is displayed during the start-up of the indicator.
The tested software version is 1.07.
Sealing
The configuration and calibration data can only be changed if the calibration jumper is installed on
the circuit board.
2.2 Function
The devices are a microprocessor based electronic weighing indicators for connection of strain gauge
load cells.
List of devices:
• Self test
• Determination and indication of stable equilibrium
• Initial zero-setting ± 10% of Max
• Semi-automatic zero-setting ± 2% of Max
• Automatic zero-tracking ± 2% of Max