PureAire Monitoring Systems, Inc.
2/22/2000
3
3.
Span Potentiometer —
This potentiometer is used to adjust the span
calibration of the system. It should only be adjusted when calibrating the
instrument.
Note:
Depending on the gas sensor a clockwise or
counterclockwise rotation increases the value; a counterclockwise or
clockwise rotation decreases the value.
4.
Cable Inlet —
This is a ¾ inch NPT opening in the transmitter housing for
connecting the 4-20 mA output and 24 VDC power cable.
WARNING:
This connection must be made using an explosion-proof
cable gland or connector to seal the inlet if the TX-KE is being installed
in a hazardous area.
5.
Cable Connection Terminal Block —
The 4-20 mA output and 24 VDC
connections are made on this terminal block. See Section 3: Installation for
more information.
6.
Sensor Connection Terminal Block —
The sensor connection is made at
the factory on this terminal block.
7.
Sensor Cover —
This cover protects the gas sensor. It threads onto the
explosion-proof housing.
8.
Gas Sensor
— A plug-in electrochemical sensor designed to detect a specific
gas. It outputs an electrical signal proportional to the concentration of the
target gas which is translated by the instrument’s electronics and
subsequently displayed on the local readout and output as a 4-20 mA analog
signal.
1.2 Model TX-KP
1.2.1 General Information
The Model TX-KP is an explosion-proof instrument designed to continuously
detect and measure non-absorptive gases, such as CO, H
2
, and oxygen. It is
suitable for use in Class I, Division 1, Group B, C and D hazardous areas.
Standard features include:
•
Explosion-proof
•
Digital or analog concentration display
•
4-20 mA output
•
Rapid response
•
One man, non-intrusive remote calibration
•
Low power consumption
•
Ideal for non-absorptive gases
•
Plug-in and disposable diffusion-type sensor cell
