TAC-H
2
S/H
2
O/O
2
Pg. 4
TEXAS ANALYTICAL CONTROLS
4418 Bluebonnet Drive | Stafford, TX 77477 | (281) 240-4160 |
www.tac-controls.com
2 Installation
2.5.1 Optional Isolated 4-20 mA
An optional isolated 4-20 mA output is available,
offering linear users definable current output that is
proportional to the gas concentration. It typically is
connected to a recorder or similar instrument, such as an analog input to a remote SCADA unit.
The connections are labeled "+" and "
-
". Its power is provided internally/self-powered. You can
purchase an isolated, loop-powered device (Part # FX-742) from Texas Analytical Controls.
2.4 Electrical Connections
The input power and the 4-20mA connections are in the analyzer’s enclosure. The power switch is in the
upper left-hand corner of the enclosure. Use it to recycle the power as needed.
If ordered, Alarm 1 and Alarm 2 are single-pole, double-throw, form C (dry contact– requires external
power). The contacts are rated for 2 amps at 125 volts AC and 4 amps at 30 volts DC. The customer
connection board includes three terminals for each relay: common (C), normally open (NO) and normally
closed (NC). These relays are fail-safe connected: When the analyzer is off or in an alarm condition, C and
NC are connected. When the analyzer is on, and no alarms are activated, C and NO are connected.
Each analyzer comes standard with an orange, 2 pin connector for flow fail signal. A 5 AMP fuse is
included to protect the analyzer from an overload. A spare fuse is also provided.
The analyzer draws approximately 1 amp, depending on its configuration. If the analyzer is powered
by solar panels, the size of the solar panel and battery is extremely important. If the analyzer’s power
requirements are not met, the controller may lose its program.
2.5 Communication Outputs
X7 Series analyzers come, standard, with a self-powered 4-20mA, Modbus via RTU serial port MJ1/2,
and RS232/485 via LAN. The Ethernet connector is used for the RS 232/485. Consult tech support to
change to the RTU port.
to back
of panel
BOTTOM VIEW
FRONT VIEW
NO
C
NC
+ / -
+ / -
12v DC
+
G
4-20 mA OUT
+ / -
+ / -
POWER IN
L1 L2 G
RELAY
FLOW FAIL
+
+
+
+
OFF
ON
ETHERNET
5A
FUSE
SPARE
FUSE
ETHERNET
PORT
STANDARD
IN
SAMPLE
IN
SAMPLE
VENT
SENSOR
VENT 1
SENSOR
VENT 2
Power / Communication
DI
03/15/23
Texas Analytical Controls Inc.
SHEET 1 of 1
TV
REV - 1.0
PLEASE NOTE:
CONFIGURATION MAY BE
DIFFERENT PENDING THE
ANALYZER ORDERED
*NOTE: Unused hubs
should retain plastic
cap(s) securely in place
when not in use to keep
analyzer internals free
from bugs and dirt.
Remove Plastic
Cap(s) As Needed
Before Installation
*
Power the instrument with a source that is not
likely to fail or to be accidentally turned off. The
analyzer will begin operating as soon as the power
is connected, drawing approximately 1 AMP at 110
VAC. Use at least an 18 AWG wire.
NOTE: Configuration may be different
pending the analyzer ordered.
For AC-Powered Units
• Use three wires.
• Connect them to the BLUE connector
labeled L1, L2, and GND.
For DC-Powered Units
• Use two wires.
• Connect them to the BLUE connector
labeled 12VDC or 24VDC.
• Red wire to "+," and black wire to "-").
