Advertisement
Instruction Manual Supplement
D104220X012
Figure 1. Loop Schematic (GE91565)
ZONE 0, Ex ia IIC
ZONE 20, Ex ia IIIC
846 ENTITY PARAMETERS
Uo = 40 VDC
Ui = 22 VDC
Ii = 57 mA
Ii = 200 mA
OR
Pi = 1.0 W
Pi = 1.0 W
Ci = 8 nF
Ci = 8 nF
Li = 20 µH
Li = 20 µH
THE ENTITY CONCEPT ALLOWS INTERCONNECTION OF INTRINSICALLY SAFE APPARATUS TO ASSOCIATED APPARATUS NOT
SPECIFICALLY EXAMINED IN SUCH COMBINATION. THE CRITERIA FOR INTERCONNECTION IS THAT THE VOLTAGE (Vmax or Ui),
THE CURRENT (Imax or Ii), AND THE POWER (Pmax or Pi) OF THE INTRINSICALLY SAFE APPARATUS MUST BE EQUAL TO OR
GREATER THAN THE VOLTAGE (Voc or Uo), AND THE CURRENT (Isc or Io), AND THE POWER (Po) DEFINED BY THE ASSOCIATED
APPARATUS. IN ADDITION, THE SUM OF THE MAX UNPROTECTED CAPACITANCE (Ci) AND MAX UNPROTECTED INDUCTANCE (Li),
INCLUDING THE INTERCONNECTING CABLING CAPACITANCE (Ccable) AND CABLING INDUCTANCE (Lcable) MUST BE LESS THAN
THE ALLOWABLE CAPACITANCE (Co) AND INDUCTANCE (Lo) DEFINED BY THE ASSOCIATED APPARATUS. IF THE ABOVE CRITERIA
IS MET, THEN THE COMBINATION MAY BE CONNECTED.
INSTALLATION MUST BE IN ACCORDANCE WITH THE NATIONAL WIRING PRACTICES OF THE COUNTRY IN USE.
LOOPS MUST BE CONNECTED ACCORDING TO THE BARRIER MANUFACTURER'S INSTRUCTIONS.
THE INSTRINSICALLY SAFE APPARATUS SHALL ONLY BE CONNECTED TO ASSOCIATED INSTRINSICALLY SAFE
APPARATUS IN COMPLIANCE WITH STANDARD EN 60079-25.
WARNING: FOR INTRINSICALLY SAFE APPLICATIONS THE APPARATUS ENCLOSURE CONTAINS ALUMINUM AND IS
CONSIDERED TO CONSTITUTE A POTENTIAL RISK OF IGNITION BY IMPACT AND FRICTION. AVOID IMPACT AND FRICTION
DURING INSTALLATION AND USE TO PREVENT RISK OF IGNITION.
FOR BARRIERS (LINEAR AND ACTIVE) THE ASSOCIATION OF Uo AND Io MUST BE SUCH THAT Po v 1W WITHIN THE SET
LIMITS OF THE 846 ENTITY PARAMETERS. REFER TO DIAGRAM ABOVE.
Neither Emerson, Emerson Automation Solutions, nor any of their affiliated entities assumes responsibility for the selection, use or maintenance
of any product. Responsibility for proper selection, use, and maintenance of any product remains solely with the purchaser and end user.
Fisher is a mark owned by one of the companies in the Emerson Automation Solutions business unit of Emerson Electric Co. Emerson Automation Solutions,
Emerson, and the Emerson logo are trademarks and service marks of Emerson Electric Co. All other marks are the property of their respective owners.
The contents of this publication are presented for informational purposes only, and while every effort has been made to ensure their accuracy, they are not
to be construed as warranties or guarantees, express or implied, regarding the products or services described herein or their use or applicability. All sales are
governed by our terms and conditions, which are available upon request. We reserve the right to modify or improve the designs or specifications of such
products at any time without notice.
Emerson Automation Solutions
Marshalltown, Iowa 50158 USA
Sorocaba, 18087 Brazil
Cernay, 68700 France
Dubai, United Arab Emirates
Singapore 128461 Singapore
www.Fisher.com
E 2017 Fisher Controls International LLC. All rights reserved.
HAZARDOUS LOCATION
NON‐HAZARDOUS LOCATION
846
846 Transducer - ATEX
846 BARRIER LIMITS
Uo ≤ 40 V
ATEX
Io ≤ 57 mA
APPROVED
Co ≤ 24.5 nF | Co ≤ 78.5 nF
BARRIER
Lo≤ 9.98 mH | Lo≤ 0.39 mH
November 2017
| Uo ≤ 22 V
| Io ≤ 200 mA
3
Advertisement
