Zemic Atex User manual

Atex Load Cell Instruction Manual
Zemic Europe B.V. T: [phone]
Leerlooierstraat 8 Nr. 2021.06 Atex Load cell instruction manual Rev5 F: [phone]
4871 EN Etten-Leur [email protected]
The Netherlands 1/12 www.zemiceurope.com
Specifications and dimensions are subject to change without notice and do not constitute any liability whatsoever.
Load cell Instruction Manual
ZHONGHANG ELECTRONIC MEASURING INSTRUMENTS CO. LTD.
Add: Xinyuan Road, North part of EDZ Hanzhong 723000, Shaanxi, China
Tel: [phone]
Fax: [phone]
E-mail: [e-mail]
Issued: June 18th 2021 Implemented: June 18th 2021
ZHONGHANG ELECTRONIC MEASURING INSTRUMENTS CO. LTD.

Atex Load Cell Instruction Manual
Zemic Europe B.V. T: [phone]
Leerlooierstraat 8 Nr. 2021.06 Atex Load cell instruction manual Rev5 F: [phone]
4871 EN Etten-Leur [email protected]
The Netherlands 2/12 www.zemiceurope.com
Specifications and dimensions are subject to change without notice and do not constitute any liability whatsoever.
Instruction Manual for Using Products
1. Introduction
These Instruction Manual refer to ZHONGHANG ELECTRONIC MEASURING INSTRUMENTS CO., LTD.
Transducers load cells for potentially explosive atmospheres. These load cells are certified according
to ATEX Directive 2014-34/EU. Please read the whole instruction before taking load cells into service.
Never work on load cells for potentially explosive atmospheres if you do have the knowledge,
competence or authorization to do so. Load cells may only be used for their intended purpose and in
the circumstances specified. ZHONGHANG ELECTRONIC MEASURING INSTRUMENTS CO., LTD.
Transducers cannot be held liable for damage and injuries resulting from use other than those
intended. Load cells must only be used in their correct technical condition and whilst conforming to
the instructions of relevant application notes.
1.1 Product Description
Load cells convert mechanical force into an electrical signal. The element deforms elastically when
subjected to a weight or force. ZHONGHANG ELECTRONIC MEASURING INSTRUMENTS CO., LTD. has
load cells which are certified for use in a potentially explosive atmosphere. These load cells have a
special mark:
1.2 Products Labelling
1.2.1 Internal Label in English：
Standard product label (Sample)
Note1: Model and Capacity and Class. ZEMIC is the trademark of ZHONGHANG ELECTRONIC
MEASURING INSTRUMENTS CO., LTD.
Note2: The label material is polyester film and the adhesive material is acrylic latex. The overall
thickness of the label is 0.05mm. long*wide=37mm*21mm
1.2.2 External Label in English：
Note1: Model. Note2: Bar code.

Atex Load Cell Instruction Manual
Zemic Europe B.V. T: [phone]
Leerlooierstraat 8 Nr. 2021.06 Atex Load cell instruction manual Rev5 F: [phone]
4871 EN Etten-Leur [email protected]
The Netherlands 3/12 www.zemiceurope.com
Specifications and dimensions are subject to change without notice and do not constitute any liability whatsoever.
1.2.3 Hazardous Area Markings：
1.3 Product identification and technical Specifications
Load cell specific information is printed on the Calibration Certificate. If this certificate is not
included, contact your supplier. Cable colour codes should be checked against the Calibration
Certificate.
2. Specific conditions for safe use
⑴Using the box provided on the nameplate, the User shall permanently mark the type of protection
chosen for the specific installation. Once the type of protection has been marked it shall not be
changed.
⑵The load cells do not have an earth ground terminal or conductor. The load cells shall be earth
grounded as part of the final installation.
⑶The non-metallic surfaces on the Load Cells enclosure may cause risk from electrostatic discharge.
Avoid installation that could cause electrostatic build-up, and only clean with a damp cloth.
3. Installation
Install in hazardous (classified) locations / explosive atmospheres per drawing 521302.
Never use load cells in a potentially explosive atmosphere which are not correctly certified. Use
shunt-diode barriers for load cell installation in potentially explosive atmospheres. When using more
than one barrier channel in a circuit, ensure that the combination of voltages and currents can be
safely applied in that particular hazardous area. Install load cells in accordance with the applicable
EU. The circuit is to be considered as being connected to earth due to surge protection.
To prevent load cell from being damaged during installation, it is strongly recommended to use
dummy load cells or mounting assemblies that can be “locked”. Load cells should be handled with
care, especially those with a low rated capacity or with metal bellows construction. When connecting
polarized shunt-diode barriers, do not connect the wrong polarity. It will destroy the barrier! Cables
used must always be suitable for the environment in which they are to be used. Many indicators
compensate for line voltage losses by increasing their voltage output. Do not pass the compensation
limit of the indicator! Never carry load cells by their cables.
Avoided electric welding after installation of load cells. If welding is necessary and the load cells can
not be removed then disconnect each individual load cell cable from the junction box or measuring
device. In order to avoid a current path through the load cells, place an earthing clamp in the close
proximity of the weld. Furthermore, connect a flexible copper lead over each load cell.
Never use mounting bolts to pull uneven surfaces together-use shims as appropriate. Never use
excessive force when fitting or tightening mounting bolts or hardware, especially on low capacity
cells. Do not twist “S” cells when tightening threaded fittings.

Atex Load Cell Instruction Manual
Zemic Europe B.V. T: [phone]
Leerlooierstraat 8 Nr. 2021.06 Atex Load cell instruction manual Rev5 F: [phone]
4871 EN Etten-Leur [email protected]
The Netherlands 4/12 www.zemiceurope.com
Specifications and dimensions are subject to change without notice and do not constitute any liability whatsoever.
4. Use and Maintenance
4.1 Please note that load cells may be damaged because of (shock) overloading, lightning strikes or
heavy surges. Also current, chemical or moisture ingress, mishandling ( dropping, lifting with cable,
etc), vibration, seismic events or internal component malfunction, may cause the loadcell to be
damaged. Inspect the loadcells before and after every season. Give special attention to critical areas
of the load cell such as metal bellows, seals etc. Regularly inspect for corrosion damage to the load
cell and mounting hardware. If practically possible, carry out cleaning and perform remedial work
(paint or other protective coating). Do not allow build-up of debris around load cells or mounts.
4.2 Maintenance Tools and the essential characteristics oftools which may be fitted to the
equipment contains:
a)A 4 1/2 digital multimeter to measure resistance, voltage, current and capacitance, etc.
b)An all-around composite screwdriver to open integrated weighing instruments, the specification
includes 4”，6”，8”;
c)A tweezers, the specification includes 6”，8”;
A long nosed pliers, the specification includes 6”，8”;
A 30w internal heating type earthing electric iron, rosin and soldering wires.
A pair of scissors, the specification includes 5”，7”;
An assorted file, the specification includes 4”，6”;
A standby Load cell and a set of weights.
4.3 Maintenance and Service Proceedings
In order to ensure the instruments, scale to be used normally and prolong their lifetime, we must
obey to the following rules:
(1) Do not use indicators under strong sunlight, the placing area should be flat
(2) When Load cell is putted it in a place full of dusts, please remove dust termly.
(3) Weight（including tare weight）forbids exceeding maximum rated amount.
(4) If the machine can’t be used for a long time, power supply switch should be taken off from power
supply which can be very good connection to earth.
(5) Forbid using strong solvent (e.g.) to clean shell.
(6) Forbid soaking water in indicator.
(7) If there is some problem occurring in the process of using, please cut power supply and stop
trying if he
is non-professional operators and give indicator to repair in professional office.
(8) Don’t change circuit or some electronic parts of an apparatus models connected with circuit.
4.4 Repairmen and maintaining service
(1)Our company can provide one year maintaining guarantee service for selling products (including
some platform scale, table scale, truck scale, vehicle scale and so on. The maintaining guarantee
service begins from selling day and each year our company will provide technical service after sales
for all the products sometime.
(2)During maintaining guarantee service time if our products exist problems which are caused not by
customers’ wrong operation or non-force majeure natural disaster, our company will have
responsibility to repair.

Atex Load Cell Instruction Manual
Zemic Europe B.V. T: [phone]
Leerlooierstraat 8 Nr. 2021.06 Atex Load cell instruction manual Rev5 F: [phone]
4871 EN Etten-Leur [email protected]
The Netherlands 5/12 www.zemiceurope.com
Specifications and dimensions are subject to change without notice and do not constitute any liability whatsoever.
(3)Our company doesn’t agree customers to repair by themselves to avoid expand problems. If due
to customers’ repairman occurs extra problems even it is in maintaining guarantee service time our
company will not provide free service.
(4)Generally speaking, when non- load cells customers or non- weighing instrument customers use
our products if the problems occur, the products should be sent to company or inform company
engineers’ problems condition by fax to solve the problem in short time and correct methods.
5. Failure Analysis and guidance on potential misuse
5.1 Failure Phenomenon
5.2 Cause analysis
5.3 Guidance
After assembly of a scale, the
reading of empty load is big and
hard to set to zero.
The Load Cell might have been
overloaded and plastically
deformed due to shock load or
impact load.
The mounting and load
introduction might not be
correct and influence the free
deflection of the load cell.
Disconnect all load cells from
electronics. Re-connect one by
one and check the individual
zero readings. If one with
exceptional high or low reading
than replace that unit. Check all
installations if no external
factors are influencing the free
deflection of the load cell.
Weighing capacity error varies
directly with the increase of
load, use multimeter to
measure input and output
impedance, one line or several
lines and other lead wires’
resistances are very large.
Load cells’ outgoing lines or
connection terminals are being
stroke, pressed or stretched
and make the circuit in the wire
brake.
The outgoing line should be
protected with spring sheath,
thus avoid the lead wire from
being extended or pressed to
slot. Because of foundation pit,
do trial assembly many times
and remove load cells if
possible.
Use multimeter to measure
input and output impedance,
the resistances are 1100-
1410Ω(bridge resistance
700Ω)or 500-710Ω(bridge
resistance 350Ω)
Being lighted or stroke by
strong current or voltage
impulse, bridge arm is burned
Adapt up-side-down mounting,
that is to say, backward under
the weighing platform; give
priority to ground mounting
by setting slope to two ends. If
designing foundation pit,
blowing pipe diameter should
meet the demand for water
discharge on rainy days.
Lower sensitivity, poor
interference-resistant,
widespread fluctuation of
weighing capacity data.
The shield connected to other
resources (with charge).
If the shield is not needed, pack
it with insulating tape and put it
into junction box to avoid the
touch with bridge-type
connection terminal.
No zero return
The speed on vehicle scale may
be too fast.
The speed should be limited
within 10km/h.
Rick to life! : Under no circumstances should fault location and trouble-shooting be attempted in a
hazardous area where there is danger of explosion. ZHONGHANG ELECTRONIC MEASURING
INSTRUMENTS CO., LTD. authorized personnel may only carry out trouble-shooting and repair.
Should a load cell cease to function, do not just reconnect: Mechanical failure may have catastrophic
effects.

Atex Load Cell Instruction Manual
Zemic Europe B.V. T: [phone]
Leerlooierstraat 8 Nr. 2021.06 Atex Load cell instruction manual Rev5 F: [phone]
4871 EN Etten-Leur [email protected]
The Netherlands 6/12 www.zemiceurope.com
Specifications and dimensions are subject to change without notice and do not constitute any liability whatsoever.
Never use a Megohmmeter to measure input or output resistance, as they normally operate at
voltages far in excess of maximum load cell excitation voltages!
6. Warning:
TO PREVENT IGNITION OF FLAMMABLE OR COMBUSTIBLE ATMOSPHERES, DISCONNECT
POWER BEFORE SERVICING.
Pour éviter l’inflammation de gaz inflammables ou inflammables, couper l’alimentation avant
l’entretien.
POTENTIAL ELECTROSTATIC CHARGING HAZARD-SEE INSTRUCTIONS .
Risque potentiel de charge électrostatique - voir instructions.

Atex Load Cell Instruction Manual
Zemic Europe B.V. T: [phone]
Leerlooierstraat 8 Nr. 2021.06 Atex Load cell instruction manual Rev5 F: [phone]
4871 EN Etten-Leur [email protected]
The Netherlands 7/12 www.zemiceurope.com
Specifications and dimensions are subject to change without notice and do not constitute any liability whatsoever.

Atex Load Cell Instruction Manual
Zemic Europe B.V. T: [phone]
Leerlooierstraat 8 Nr. 2021.06 Atex Load cell instruction manual Rev5 F: [phone]
4871 EN Etten-Leur [email protected]
The Netherlands 8/12 www.zemiceurope.com
Specifications and dimensions are subject to change without notice and do not constitute any liability whatsoever.

Atex Load Cell Instruction Manual
Zemic Europe B.V. T: [phone]
Leerlooierstraat 8 Nr. 2021.06 Atex Load cell instruction manual Rev5 F: [phone]
4871 EN Etten-Leur [email protected]
The Netherlands 9/12 www.zemiceurope.com
Specifications and dimensions are subject to change without notice and do not constitute any liability whatsoever.

Atex Load Cell Instruction Manual
Zemic Europe B.V. T: [phone]
Leerlooierstraat 8 Nr. 2021.06 Atex Load cell instruction manual Rev5 F: [phone]
4871 EN Etten-Leur [email protected]
The Netherlands 10/12 www.zemiceurope.com
Specifications and dimensions are subject to change without notice and do not constitute any liability whatsoever.
EC-Declaration of Conformity
EC-Declaration of conformity of a sub-assembly with ATEX-Directive 94/9/EC
We, the manufacturer,
Zhonghang Electronic Measuring Instruments Co., Ltd. Xibudadao road 166, 710000 Xi’an.
Hereby declare that the load cells described below:
2H3, B3G, H3G, BM3, H3, H3C, H3A, H3E, H3F, H3J, B8D, B8K, BM8D, BM8F, BM8H, H8, H8B, H8C,
H8E, H8K, HM8, HM8C, B6E, B6F, B6G, B6N, B6Q, BM6A, BM6G, H6B, H6E, H6E3, H6F, H6G, H6G5,
B9C, B9D, B9E, B9F, B9H, B9J, B9K, H9B, H9C, H9D, H9N, HM9B, HM9C, HM9E, BM11, HM11,
BM14A, BM14C, BM14D, BM14G4, BM14K, HM14C.
Serial numbers can be found in calibration certificate added to the shipment.
With markings:
and
II 1G Ex ia IIC T4 Ga or
II 1D Ex ia IIIC T200 135°C Da or
II 3G Ex ic IIC T4 Gc or
II 3D Ex tc IIIC T73°C Dc.
And corresponds to the production model described in the EU type-approval certificate and to the
requirements of the Council Directive 2014/34/EU:
EN60079-0:2018, EN60079-11:2007, EN60079-15:2005, EN60079-26:2007, EN61241-0:2006,
EN61241-11:2006 and EN60529:1991 + A1:2000.
The loadcells mentioned, received a certificate after exam of conformity by notified body 2809 FM
Approvals, Element 78, 1 Georges Quay Plaza, Dublin Ireland. The certificate number:
FM07ATEX0017X –Issue 2.
This declaration is issued under the sole responsibility of the manufacturer.
This document is signed for and on behalf
of:
Zhonghang Electronic Measuring Instruments Co., Ltd.
Place and date of issue:
07-06-2021, Etten-Leur
Name and Function:
Sander Fiere, Technical Manager
Signature: