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5 electrical connections, 5 electrical connections 15 – Teledyne 2000XTC - Thermal conductivity analyzer User Manual

Page 25

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Thermal Conductivity Transmitter

Installation

CAUTION:

THIS INSTRUMENT IS DESIGNED TO HANDLE
HAZARDOUS GASES. WHENEVER A FITTING IS
OPENED, USE A NEW FERRULE AND CONE TO
SECURE A GAS TIGHT SEAL. EACH FITTING MUST
BE LEAK CHECKED WHENEVER A CONNECTION
HAS BEEN OPENED OR DISTURBED IN ANY
MANNER.

The inlet gas pressure should be regulated between 2-20 psig. A

flow control device should be installed before the “sample in” port in
order to keep the gas flow between 0.4 and 2 SCFH.

If greater flow is required for improved response time (over 20

SCFH), install a bypass in the sampling system upstream of the analyzer
input.

Exhaust connections must be consistent with the hazard level of

the constituent gases. Check local, state, and federal laws, to ensure
the exhaust stream vents to an appropriately controlled area if
required. The exhaust should be vented to atmospheric pressure or
returned to the process line. Use care not to create backpressure in
the vent line.

3.5 Electrical Connections

The Thermal Conductivity Transmitter requires three electrical

connections:

24 VDC power input



Signal output (4-20 mA current output)

Interconnection cable

Power and output signal connections are made to the galvanic

isolator module according to the interconnection diagram C-74837
included at the back of this manual. See also Figure 3-3.

24VDC Power Connection

The 24VDC power supply can deliver a maximum of 10.8 watts to

power the heaters and drive the electronics in both the galvanic isolator
and the transmitter modules. Connect the positive lead from the 24 VDC
source to terminal 7 and the negative lead to terminal 8 on the galvanic
isolator module as shown in Figure 3-3.

Teledyne

Analytical

Instruments

15