Electrical Connections; Environmental Conditions; Ingress Protection - Mettler Toledo WXS Serie Manual De Usuario

4 Operation

4.1 Electrical connections

WX weigh modules have an RS232C interface for the communication with the control systems.
Interface descriptions
Interface type
Interface update rate (max.)
Power supply for the weigh module
Input voltage
Input current
Use a stable power supply with no voltage fluctuations.
•
If voltage fluctuations cannot be prevented, use a voltage regulator to deliver a constant voltage
•
value to the load cell.
The power supply must be approved by the respective national test center of the country in which
•
the weigh module will be used.
Always operate the weigh module with the standard AC adapter delivered in the scope of delivery. The
AC adapter is suitable for use with the following voltage range:
100 – 240 VAC, 50/60Hz
NOTICE
Check whether your local power supply falls within this range. If it does not, DO NOT connect the
electronic unit or the AC adapter to your power supply and contact your local METTLER TOLEDO
office.

4.2 Environmental conditions

WX weigh modules can be operated within the following environmental conditions:
Temperature Range
Relative air humidity
Height above mean sea level
Warm-up time

4.3 Ingress protection

IP rating of the WX weigh modules:
When the plastic cover is attached and the connector cable is hooked up, the load cell achieves an
IP45 rating.
If you wish to use a sprayer or water jet to clean the load cell, take appropriate measures to prevent
water from building up between the base plate and the support. This could allow water to penetrate
the load cell from below. Seal the gap between the support and the load cell base plate with a
suitable gasket or sealing agent.
In operation, the load cell is rated IP30.
The electronic unit meets IP40.
The PWT and SWT terminals are rated IP54.
Weigh Modules
RS232C, bidirectional, full duplex, 600 to 38'400 bps
23 weight values per second (with terminal)
92 weight values per second (without terminal)
12 V DC nominal
0.84 ADC
Operating /
Compensated
Allowable ambient
+10 ... +30 °C
+5 ... +40 °C
Max. 80 % at 31 °C, decreasing linearly to 50 %
at 40 °C, non-condensing
Max. 4'000 m (13'330 ft)
At least 120 minutes after power up
Operation 9