YOKOGAWA FU20-FTS, Инструкция по эксплуатации, Страница: 13 / 32

13
IM 12B06J03-05EN-P
Remarks:
1 No revision to this drawing without prior approval of FM.
2 Installation must be in accordance with the National Electrical Code (ANSI/NFPA 70),
ANSI/ISA-RP12.06.01, and relevant local codes.
3 The sensor shall be installed to a certified intrinsically safe HOST with the following
maximum values: Uo= 18 V, Io = 170 mA, Po = 400 mW.
4 The sensor does not provide isolation from earth. Installers shall take necessary
measures to prevent the possibility of sparking resulting from differing earth
potentials between the sensors and interconnecting equipment. This can be realized
for example by selecting interconnecting equipment which provides input-to-output
and input-to-earth isolation up to 500 V rms.
5 Sensor Model code:
Table 3:
Model Suffix Codes Option Codes
FU20 -ab-cd-efg /h
ab
Connection type:
Two alphanumeric characters identifying the
length of the permanent cable, each character
from 0 to 9
VP Connector without ID-chip
VS Connector with ID-chip
cd
Temperature sensor
+ Region:
T1 Pt1000, IS for ATEX/IECEx, FM-US,
FM-CAN
efg
Type:
FTS PVDF body/Tapered Thread/
Dome shaped/Sodium-ions
sensitive membrane/Silicon&Viton
sealings
MTS PVDF body/Tapered Thread/
Dome shaped/Sodium-ions
sensitive membrane/FFKM&EPDM
sealings
RTS PPS body/Tapered Thread/Dome
shaped/Sodium-ions sensitive
membrane/Silicon&VITON sealings
h
Option code:
Up to ten alphanumeric characters
(A to Z, 0 to 9 or hyphen)
6 WARNING
－
POTENTIONAL ELECTROSTATIC CHARGING HAZARD
– SEE
INSTRUCTIONS
pH sensors containing accessible plastic parts and/or external conductive parts, must
be installed and used in such a way, that dangers of ignition due to hazardous
electrostatic charges cannot occur, especially in the case that the process medium is
non-conductive.