Yokogawa 2-Wire Dual Channel Transmitter/Analyzer FLXA21 - Manual (Page 34)

<2. WIRING AND INSTALLATION>
2-7
IM 12A01A02-01E 5th Edition : Oct. 31, 2013-00
2.5 Sensor wiring
The FLXA21 can be used with a wide range of commercially available sensor types, both from
Yokogawa and other manufacturers.
Terminal screw size is M4, and torque of screw up is 1.2 N•m.
Pin terminal, ring terminal and spade terminal can be used.
Pin terminal: pin diameter: max. 1.9 mm
Ring and spade terminal: width: max. 7.8 mm
For details on the sensors, refer to the respective instruction manuals of the sensors.
NOTE
When the wiring of sensors is finished, be sure to attach the wiring covers. Furthermore, make
sure the module is locked with the mechanisms on the left and right of the module.
Lock Unlock
Figure 2.8 Locking the module
NOTE
Confirm that all locking-tabs (including for BLANK slots) are “Locked” position when close the
front panel.
If locking-tabs are “Unlock” position, the front panel may be interfered with locking-tabs.
NOTE
When input 2 is used, the upper-level module is for input 1. Be careful not to make a mistake
when wiring the modules.
When input 2 is used, first wire input 2 which is on the lower second module, and attach the
wiring cover.
Even when input 2 is not used, first attach the power supply/grounding wiring cover and then the
wiring cover for the second module, and finally wire input 1.
When all sensor wiring is completed, close the front panel of the FLXA21, and turn on the power.
Make sure that the display is normal.
CAUTION
Do not tighten up four front panel screws one by one.
Each front panel screw should be tightened up in two times of screwing. And, firstly the screw at
the upper left should be screwed a bit, the next is at the lower right, third is at the upper right, and
fourth is at the lower left. The second round is the same sequence again to tighten up four screws.
Do not use an electric screwdriver with high revolutions. If an electric screwdriver is used for
these front panel screws, the revolutions of the electric screwdriver should be less than 400 rpm.
Four screws should be tightened to the following torque;
0.8 to 0.9 N•m (for the plastic housing)
1.5 to 1.6 N•m (for the stainless steel housing)
PH
SC
ISC
DO
SENCOM
2