COSA Xentaur Xentaur XDTL-HT - Manual (Page 15)

Installation
15
Wiring Relay Contacts
Standard XTDL-HT™ has one mechanical relay for user
control. Two more relays are available when optional
I/O board is installed. Depending on the ordered
option, the instrument can be installed with:
 Mechanical relays (250VAC, 10A max. rating)
 Solid state relays (240VAC, 5A max. rating)
 Class I Division 2 relays (250VAC, 6A max. rating)
Use wiring appropriate for the voltage and current that
will be switched by the relays. Wires to the relays
should be fed through one of the cable grips (third
cable grip is recommended). For relay 1, connect the
wires to the DIN-mounted terminal blocks marked 7
and 8. Refer to
Relays chapter for setup information.
Startup
The instrument air pressure should be set at 60-70 psi on both regulators to
allow sufficient pulling force to the eductors. The sample pressure should be
held at a fixed value in order to maintain the measurement accuracy. This is
accomplished by setting the back pressure regulator inside the enclosure. Any
value in the operating range can be used as the instrument has pressure
compensation on measurement. 1-2 psi below atmospheric pressure is
recommended. To set the pressure:
1. Set the 3-way valve to
process gas.
2. Set the back pressure
regulator until the sample
pressure is at the desired
setpoint.
Close the enclosure door after
the pressure is set. It will take
about 1 ½ hours to reach the
desired internal temperature
depending on the ambient
environment. Measurement
reading may fluctuate until
then. Monitor the sample
temperature for stability if
Relay cable installation
3-way valve
Back pressure regulator
Lift and Turn knob to
set regulator pressure