Table of Contents
Advertisement
Installation
January 2024
Table 1-2: Terminal Specifications
Terminal (detector wire
color)
5 (grey)
Earth
Note
Minimum voltage to the 625IR is 18 Vdc.
Table 1-3: Cable size and maximum length
Cable cross section
0.03 in.
2
(0.75 mm
2
)
0.04 in.
2
(1.0 mm
2
)
0.06 in.
2
(1.5 mm
2
)
0.1 in.
2
(2.5 mm
2
)
0.2 in.
2
(4 mm
2
)
(1)
For a nominal power of 24 V. Longer cable can be used with higher supply voltage.
Related information
Light indicator
HART status flags
1.5.1
Boot up the detector
Procedure
Turn on the power to the detector.
The detector has a boot-up time of < 2 minutes when ambient temperature is above
-4 °F (-20 °C). During this time, the detector runs self-diagnostics and if the indicator is
configured to be active, it will be yellow.
Postrequisites
After this boot-up time, the detector is ready to detect gas, but for a very precise and
accurate test, allow the detector another 20 minutes to warm up.
18
(continued)
Signal type
RS-485 B
External earth point
Internal earth point
Voltage drop
∼5.8 V
Specification
communication, Modbus
®
remote terminal unit (RTU)
Use external grounding when the detector is installed in an
Ex zone.
Normally not used. Shield of the cable is typically connected
to instrument earth in the central control cabinet and is
normally not terminated at the detector.
If extra radio frequency interference (RFI) is required, and
the installation's grounding principles/regulations allow it,
you can terminate the shield to local ground via the internal
earth point at the detector.
Maximum cable length
656 ft. (200 m)
820 ft. (250 m)
1312 ft. (400 m)
2133 ft. (650 m)
3281 ft. (1000 m)
Manual
MS-00809-0100-3625
Cable requirement
cross section 0.01 in.
2
(0.14
mm)
2
/0.1 in.
2
(2.5 mm
2
)
(stranded) or maximum 0.2
in.
2
4 mm
2
(solid)
(1)
Emerson.com
Advertisement
Table of Contents
