VPG BLH NOBEL User manual

Single channel Load cell
KOSD
KIMD
KISD
Double channel Load cell
KOSD-D
KIMD-D
User manual

Contents
Precautions
Intended use
General……………………………………………… 1
Specification………………………………………… 3
Intrinsic safety………………………………………. 4
Load cell ATEX Label……………………………… 4
Functional safety……………………………… 5
Electrical connection and supply voltage………… 6
Load cell connection………………………………... 7
Application examples……………………………. 7
Mechanical installation and maintenance………… 8
Mechanical data…………………………………….. 8
Appendix 1. Declaration of Conformity…………… 9
Appendix 2. ATEX / IECEx / Safety Certificate….. 10

PRECAUTIONS
READ this manual BEFORE operating or servicing this unit.
FOLLOW these instructions carefully.
SAVE this manual for future reference.
DO NOT allow untrained personnel to operate,
clean, inspect, maintain, service, or tamper with
this unit.
INTENDED USE
KxxD (-D) line of load cells are intended for industrial systems. Its basic function is force
measuring or weighing applications. The strain gauge bridge output wiring is connected to
an overall measurement system.
Changes to current manual version
Detailed application, intrinsic safety and functional safety information added.
WARNING
Only qualified personnel are permitted to install and service this unit.
Exercise care when making checks, tests and adjustments
that must be made with power on.
Failing to observe these precautions could result in bodily harm.

Load cell KxxD-(D)
1
General
KxxD-(D) is a line of load cells (KOSD-(D), KIMD-(D) and KISD-(D)) with a high degree
of protection. They incorporate resistive strain gauges, measuring the shear force or
tension.
The KxxD-versions have one electrical circuit and the KxxD-D-version two separate
electrical circuits. For the KxxD-D-version the safety parameters are applicable to each
circuit individually. The two separate electrical circuits are insulated from each other.
The following KxxD-D load cell configurations are available:
Single bridge load cell with
connector or cable connection
Single bridge configuration
Dual bridge load cell with
common connector or common
cable connection
Dual bridge configuration with common
external connection (-D)
Dual bridge load cell with
individual connector or cable
connections.
Dual bridge configuration with separate external
connections (-D)
Connector
or cable
Connector
or cable
Connector
or cable
Connector
or cable

User Manual
2
The load cells can be supplied with connector or cable connection (see also page 6 and 7).
4-pin connector Cable connection
 KxxD with one 4-pin connector or cable
 KxxD-D with one 8-pin connector or cable connection
 KxxD-D with two 4-pin connectors or dual cable connections
 KxxD-D with one 4-pin connector and single cable connection
These load cells are approved for use in an explosive hazardous area, provided that
suitable intrinsic safety barriers or insulators are used and no rubbing with electrostatic
materials occurs on outside potted cavities surfaces.
CE-marking according to ATEX and EMC Directives, see appendix 1.
Potted
cavities
Rotation reference
surface

Load cell KxxD-(D)
3
Specifications
Approvals:
ATEX intrinsic safety For KxxD-X, Baseefa02ATEX0072 Issue 3, see appendix 2
IECEx intrinsic safety For Kxx(D)-(D)X, IECEx BAS 14.0015X Issue 2 see appendix 2
Functional safety TÜV 968/FSP 1462.00/17, see appendix 2
Environmental conditions:
PARAMETER Min. Typ. Max. UNIT
Environmental protection / IP rating IP67
Operating Temperature (Tamb ) -40 +60 °C
System parameters: See LC calibration data sheet
Load cell strain gauge:
Impedance 350 Ohm
ATEX conditions:
Insulation test 500 Vrms
Input parameters See appendix 2

User Manual
4
Intrinsic safety
All load cells KxxD (-D) can be approved for use in explosive gas or dust area.
The last ‘X’ in the type code (see load cell ATEX label) is a number to identify the specific
model. They can be ordered either with a cable connector or with an integrated cable.
The safety description is labelled on the load cell.
For the –D version, the safety description and connection is applicable to each load cell
bridge output.
Internal capacitance and inductance see ATEX approvals.
The cable inductance is negligible compared to the allowed upper limit.
Load cell ATEX Label

Load cell KxxD-(D)
5
Functional safety
From a safety point of view is the KxxD-(D) load cell an individual safety component
connected to an overall safety control unit. Each individual amplifier strain gauge
bridge output shall be connected to separate control system input(s) as view in figure
below, see also application examples.
For double channel system, cross monitoring of measurement signals is assumed to be
implemented in the overall measuring instrument. The hardware reliability figures for
the double channel load cell are valid when the overall measuring instrument is
fulfilling correct monitoring of the load cell(s).
KxxD load cell safety parameters
According to EN ISO 13849-1:
- Category = 1
- MTTFd = 48 year
- Maximum performance level, PL = c
KxxD-D load cell safety parameters
1. According to EN ISO 13849-1:
- Category = 3
- MTTFd= 48 year
- Maximum performance level, PL = d
The achievable performance level assumes that the double channel load cell shall be
connected to an overall measuring instrument in a category 3 structure with a
diagnostic coverage, DC ≥90%. (Value of DC level is according to Annex E, table E.1).
The comparison tolerance must be selected with respect to the specified element safety
function.
2. According to EN 61508 with DC Low 3. According to EN 61508 with DC High
- HFT = 1
- SFF = 80%
- PFH = 1.16*10-8
- λs= 1,20*10-6
- λdd = 7,21*10-7
- λdu = 4,80*10-7
- Maximum SIL = 2
- HFT = 1
- SFF = 99.5%
- PFH = 2,41*10-10
- λs= 1,20*10-6
- λdd = 1,19*10-6
- λdu = 1,20*10-8
- Maximum SIL = 2
The overall measurement system (control) must implement the following diagnostic
technique: “Input comparison/voting (1oo2, 2oo3 or better redundancy)” with
DC = Low (60%) or DC = High (99%) according to IEC 61508-2 Table A.13.
The comparison tolerance must be selected with respect to the specified element safety
function.
KxxD
Control
output
Control
mV/V
out
p
ut 1
Control
Control
output
KxxD-D
Load
Load mV/V
out
p
ut 2
mV/V
out
p
ut

User Manual
6
Load cell connection
The load cell single or double strain gauge bridge outputs shall be connected using
shielded cable. It shall than be connected to the measuring equipment bridge mV/V
input signal channel
The bridge power shall be connected to E+ and E- outputs and the measuring equipment signal
input shall be connected to the S+ and S- outputs.
The cable should be routed at least 100 mm from other cables, so that electromagnetic
interference is avoided. Cable shield is not connected to the load cell body and shall be
grounded in the other end. The load cell connector housing is connected to the load cell
body and the cable shield shall not be connected in the cable connector but be grounded
in the other end. Cable shield is then grounded in one point only.
For installation in an explosive gas/dust or mining area, only trained personnel may
perform dimensioning of cables and barriers. A descriptive system document should be
prepared by the system designer.
* Deviations may occur in customer specific types.
Connector pin-out and wires color code:
Electrical connection
Connector type: (M12 or equivalent IP67 qualified)
Cable: Shielded 4 or 8-wire 0,25mm2 cable through IP67 qualified cable gland
Connector pin number *
Pin 1: E+ (positive excitation). Bridge 1
Pin 3: S+ (positive signal). Bridge 1
Pin 2: S- (negative signal). Bridge 1
Pin 4: E- (negative excitation). Bridge 1
Pin 5: E+ (positive excitation). Bridge 2
Pin 7: S+ (positive signal). Bridge 2
Pin 6: S- (negative signal). Bridge 2
Pin 8: E- (negative excitation). Bridge 2
Cable: Cable wire colour *
Red: E+ (positive excitation). Bridge 1
Green: S+ (positive signal). Bridge 1
White: S- (negative signal). Bridge 1
Grey: E- (negative excitation). Bridge 1
Brown: E+ (positive excitation). Bridge 2
Blue: S+ (positive signal). Bridge 2
Yellow: S- (negative signal). Bridge 2
Pink: E- (negative excitation). Bridge 2

Load cell KxxD-(D)
7
Application examples
Load cell KxxD (one strain gauge bridge) and KxxD-D (two strain gauge bridges), used
in a non-hazardous area, are shown below.
Load cell KxxD-D used in hazardous area is shown below. The cable shield is not
connected to the load cell body and shall be connected in the other end. Connection to
barrier or isolating IS unit is shown in the example below
Load cell as a safety component can be used in both hazardous and non-hazardous
areas and be connected to the measuring control in the same way.

User Manual
8
Mechanical installation and maintenance
Load cells of the line KxxD-(D) are designed to be supported at both ends and loaded at
the middle of the cylindrical body (KIMD, KOSD and KISD). An arrow on one or both
ends defines the correct direction of the resulting force from the applied load.
At the cable/connector end of the load cell, a flat reference surface or key slot are
provided (KIMD, KOSD and KISD). It should be used to prevent the cylindrical load cell
body from rotating in the supports.
Standardized adapters for some load cell types are available, others can be custom
designed and produced by Vishay Nobel. On request the mechanical shape of a load cell
can also be altered to suit an existing structure.
Potential electrostatic hazard on KIMD-(D), do not rub with electrostatic materials.
Potential electrostatic hazard on KIMD-(D), do not rub with electrostatic
materials.
Mechanical data
KxxD-(D) series of load cells are often custom made for specific applications. For
complete mechanical data on these load cells, refer to the detailed technical
specification.

Load cell KxxD-(D)
13
IECEx Certificate
The IECEx certificate for the KxxD (-D) Load cell can be found on the official IECEx web site:
http://iecex.iec.ch
Certificate number: IECEx BAS 14.0015X Issue No: 2.
Function safety Certificate
The functional safety certificate for the KxxD (-D) Load cell can be found on TÜV Rheinland
web site: www.fs-products.com and www.certipedia.com/fs-products
Certificate number: 968/FSP 1462.00/17 Issue No: 0

Vishay Nobel AB
Box 423, SE-691 27 Karlskoga, Sweden
Phone [phone] ꞏ Fax [phone]
[email protected]
www.blhnobel.com
Document no: 35218
Publication: 600659R7
© Vishay Nobel AB, 2020-02-17
Subject to changes without notice.