Load Cell Marking Slc611; Special Conditions For Safe Use; Commissioning And Installation - Mettler Toledo SLC611 Documentación De Usuario

d. Installation shall be in accordance with applicable local standards for hazardous areas.
e. The sum of the rated power Po of all excitation devices must be less than or equal to the power parameter Pi of one load cell.
f. The sum of the excitation voltage Uo of all excitation devices must be less than or equal to the voltage parameter Ui of one load cell.
g. The sum of the current Io of all excitation devices must be less than or equal to the current parameter Ii of one load cell.
h. The load cell capacitance Ci and inductance Li varies with cable length as follows:
Cable Length
12 m (39 ft)
20 m (66 ft)
Per m (3.3 ft)
i. In calculating the capacitance and inductance of the system, use these default values for connection cables (home-run cable, for
example) unless the actual values are known:
a. Capacitance of the connection cable: 0.2 nF per meter
b. Inductance of the connection cable: 1 μH per meter.
j. The capacitance parameter Co of the excitation device must be greater than or equal to the sum of the capacitances in the circuit (e.g.,
the capacitance of the connection cables plus the sum of the capacitances Ci of all load cells in the circuit).
k. The inductance parameter Lo of the excitation device must be greater than or equal to the sum of the inductance of the connection cables
plus the inductance Li of one load cell.
Note: The entity parameters of any other devices in the circuit (e.g., a Junction Box) must be taken into account in assessing the
compatibility of devices.
l. In an explosive atmosphere caused by air / dust mixtures, the loose ends of the cable shall be connected outside the hazardous area
or in a suitable enclosure with a degree of protection of at least IP6X in accordance with EN 60529.
m. Not following these instructions will jeopardize the explosion safety.

2.4 Load Cell Marking SLC611

Other markings are as shown in the following labels which are attached to the product. At the time of installation the appropriate box on
the left hand side of the Hazloc label must be checked with a permanent waterproof marker to indicate the applicable protection, once
selected it may not change.
For Details on temperature class / coding please see section 2.1
Load cell variations include capacity, metrological performance, cable length, label and jacket material of polyurethane or FEP.

2.5 Special Conditions for Safe Use

2.5.1. Non Electrostatic Charges
Optionally the load cells (model number SLC611c) can be provided with a corrosion protection coating which is non-conductive. In this
case propagating brush discharges must be avoided. Clean the load cell using a wet method to avoid static charge generation. Do not
rub the load cell with a dry cloth.
If the load cell is installed in a Category 1G hazardous Location with a gas group IIC, care must be taken to avoid intensive electrostatic
charges. Ensure that the load cell housing is grounded to the local structure and avoid static generating actions such as contact with
flowing materials or conveyor belts. Clean the load cell using a wet method to avoid static charge generation. Do not rub the load cell with
a dry cloth. Ensure that the load cell cables are laid in such a way that they are protected against static charges.

3 Commissioning and Installation

a. This equipment can be used in zone 1, 2, 21 and 22.
b. The allowed ambient temperature range is specified in section 2.1
c. This equipment complies with protection class > IP68 / EN 60529.
d. The equipment must be grounded
e. The load cell must not be used if it is defective or shows any visible damage.
4
Commissioning and Installation
Capacitance Ci
2.5 nF
4 nF
0.2 nF
Inductance Li
12 μH
20 μH
1 μH
30129850A Load Cell SLC611