<Appendix 3 Control Drawings>
App.3-4
IM 12A01A02-71E 3rd Edition : Mar. 23, 2018-00
Model: FLEXA Series Date: April 17, 2015
Rev.1: May 29, 2017 Doc. No.: IFM039-A72 P.2
Yokogawa Electric Corporation
Unclassified Location
Installation for Division 2 / Zone 2
Applicable models: FLXA21-D-x-x-CD-xx-xx-F-..., FLXA21-D-x-x-CD-xx-xx-P-…
FLXA21-D-x-x-DD-xx-xx-F-..., FLXA21-D-x-x-DD-xx-xx-P-…
Hazardous (Classified) Location
Class I, Division 2, Groups A, B, C, D, or
Class I, Zone 2, Group IIC,
Temperature Class: T4
Measuring Module 1 (Note 8):
Type of Measuring Module
pH, SC, DO ISC SENCOM
Uo 11.76 V 11.76 V 5.36 V
Io 116.5 mA 60.6 mA 106.16 mA
Po 0.3424 W 0.178 W 0.1423 W
Co 100 nF 100 nF 31 μF
Lo 1.7 mH 8 mH 0.45 mH
Supply +
+
Control Equipment
(Note 9)
Supply
Housing Assembly
Measuring Module 1
FLXA21 Analyzer
Sensor 1
(Note 8)
T
T
Terminators
Other
Field Devices
Supply +, Supply
(Note 9):
Ui: 24 V
Ci: 2.72 nF
Li: 0 mH
Specific condition of use:
- Electrostatic charges on the non-metallic or coated parts of the two wire analyzer shall be
avoided.
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