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It is recommended to install vertically on the side to create strong air convection for the heat dissipation teeth. If necessary, install a fan near the driver to forcefully dissipate heat and ensure that the driver operates within a reliable temperature range.
ABB CTI 21-PEx 3BDH000741R1| I-O_Module|

The following is a compilation and translation of the information you provided for ease of understanding and use:
—
? Product Information Overview
Product Type: I/O Module
Input Type : Analog Input (AI)
Number of input channels : 32 channels
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? Physical dimensions and weight
Net width: 45 mm
Net height: 340 mm
Net depth: 204 mm
Net weight: 0.9 kg
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⚙️ Technical specifications
Channel Isolation : Each channel is isolated
Applicable input types :
Thermocouples
Pt -/Ni 100 thermistor
Millivolt/Volt Signals
Resistance signal
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? Explosion proof and certification
Explosion proof grade: II (2) G \ [Ex ib IIC Gb]
Certification Standards:
EN60079-0
EN60079-11
ATEX certification: Yes
ABB CTI 21-PEx 3BDH000741R1| I-O_Module|
? Necessary attachments
Recommended attachment : CI 120/121 Ex Cable Clamp, a total of 4 are required
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? Environmental Protection and Compliance
RoHS Status: Compliant with EU RoHS Directive 2011/65/EU and 2015/863 Amendments
WEEE Classification: Class 5- Small Equipment (No single side exceeding 50 cm)
SCIP Notification Number: 468c5312-4b8c-45e1-9cb8-78ee19a4729e (Germany)
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? Customs and Classification
HS code: 853890- Parts suitable for equipment of class 85.35, 85.36, or 85.37
Customs code refinement: 85389099
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By structuring the information in this manner, the article provides a clear and organized understanding of input channels, transducer supply, and communication implementations in distributed control systems.
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