<2. Wiring and Installation>
4
IM 12A01A02-12E
9th Edition : Mar. 23, 2018-00
2. Wiring and Installation
Open the front panel and remove the plastic wiring covers, and then install the cable glands (refer
to the Appendix A1). The wiring covers will be re-installed after the wiring is completed.
2.1
Installation site
The FLXA202/FLXA21 is weatherproof and can be installed both inside and outside. It should,
however, be installed as close as possible to the sensor to avoid long cable runs between the
instrument and sensor. When a pH sensor is used, the cable length including the sensor cable
should not exceed 20 meters (65.6 feet); 60 meters (197 feet) when using BA10 extension box
and WF10 cable. For a conductivity sensor the cable run should not exceed 60 meters (197
feet). For dissolved oxygen the sensor cable run should not exceed 30 meters (100 feet). For
SENCOM pH/ORP the sensor cable run should not exceed 20 meters (65.6 feet).
Select an installation site that meets the following conditions.
• Mechanical vibrations and shocks are negligible
• No relay switch and power switch are installed close to the converter
• There is space for cable connection beneath the cable glands
• Not exposed to direct sunlight or severe weather conditions
• Maintenance is possible
• No corrosive atmosphere
• Ambient Operating Temperature: -20 to +55 °C
• Humidity: 10 to 90% RH at 40 °C (Non-condensing)
• Water Protection: IP66 (except Canada), NEMA 4X (except Canada), Type 3S/4X (Canada)
If the instrument is installed outside and exposed to direct sunlight, a sun shade hood should be
used.
The FLXA202/FLXA21 can be mounted on a wall, pipe or panel when the mounting kit is
ordered. For dimensional information please refer to the Appendix, Mounting methods.
2.2
Wiring the power supply
FLXA202/FLXA21 is a 2-wire analyzer and can be powered by a DC power supply.
• Output is FOUNDATION Filedbus and PROFIBUS PA option
The Power Supply voltage is 9 to 32V DC.
• Output is mA with HART
The load resistance: impedance of electronic equipment: typically 250 Ohm
Number of input modules: 1-sensor measurement or 2-sensor measurement.
One (1) Sensor module (1 input):
16 to 40 V DC (for pH/ORP, SC and DO)
17 to 40 V DC (for ISC)
21 to 40 V DC (SENCOM pH/ORP)
Two (2) Sensor modules (2 inputs):
22.8 to 40 V DC (for pH/ORP, SC and DO)
