HygroPro
II
User's Manual
5
Chapter 1. Installation
Step 3:
Install the HygroPro
II
into the process by threading it into the sampling port or sample cell. Please note the
transmitter should be tightened using a 1-1/8” wrench only on the hex nut of the probe until it is sealed on the
O-ring surface. Please do not torque the display head, but gently swivel it to face the correct direction after
the probe is fully tightened.
Figure 6: HygroPro
II
installation step 3 – installing into sample cell
1.4 Wiring the Transmitter
Proceed to the appropriate section for instructions on:
• Standard Wiring Connections (proceed to the next page)
• Hazardous Area Wiring Connections (proceed page 9)
1.4.1
Standard Wiring Connections
The HygroPro
II
is a 4-20 mA loop-powered device that can use the same two conductors for its measurement signal
lines and its power supply lines. Follow the installation instructions in this section only for units
not
requiring
hazardous (classified) area protection.
IMPORTANT:
To install the HygroPro
II
in a hazardous (classified) area,
see “Hazardous Area Wiring Connections” on
The transmitter must be wired using the factory-supplied 2-meter or 10-meter 4-wire shielded black standard cable.
If a different cable length is required, please contact the factory for assistance.
Note:
If a longer cable is required, you may splice an extension onto the standard cable. Please be sure to connect
leads of the same color together. For example, connect blue lead to blue lead, brown lead to brown lead, etc.
The HygroPro
II
may be connected to the following types of external data acquisition and control systems:
1.
An external device (such as a process controller) that can provide the loop power to the HygroPro
II
and can also
receive and display the 4-20 mA analog output from the HygroPro
II
(proceed to next page)
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