MSA
Installation
ULTIMA X ® Series
34
GB
Connecting the Cable in a Typical Gas Monitor from the ULTIMA® X Series
Fig. 8
PCB
(1) Unscrew instrument enclosure and remove instrument electronics assembly.
(2) Read the label on the side of the instrument electronics assembly.
A-ULTX-PCB-E-1 is a two-wire unit, 4-20 mA output
A-ULTX-PCB-E-2 is a two-wire unit with HART protocol on the
4-20 mA output
A-ULTX-PCB-E-3 is a three-wire unit, 4-20 mA output
A-ULTX-PCB-E-4 is a three-wire unit with HART protocol on the 4-20 mA
output.
(3) C24 V DC to contact 1 of the J8 plug.
(4) Connect 4-20-mA input of remote system to contact 2 of J8 plug.
(5) For 3-wire instruments, connect the instrument earth [signal earth] to contact
3 of the J8 plug [contact 3 is not used in 2-wire instruments].
The following procedure applies for 2-wire 4-20 mA Gas Monitors with
control circuit and 3-wire Gas Monitors with separate power supply.
Refer to ULTIMA
®
X Series addendum "Gas Monitors with X3 Technol-
ogy" for ULTIMA
®
X3
TM
connection details.
1
PCB Identification
1
If using the HART signal terminate the 4-20 mA line with 230 to
500 Ohms
