Installing The Probe Directly Into The Process; Installing The Probe In A Sampling System; Electrical Connections - E+E Elektronik EE375 series Bedienungsanleitung

3.2

Installing the probe directly into the process

When installing a probe directly into the process, there should be a stop valve on both
sides of the point of installation.
This makes it easy to remove the transmitter for maintenance and calibration.
3.3

Installing the probe in a sampling system

Sampling is necessary if direct installation of the probe in the process is not possible or
not required. Reasons may include:
- an excessive process temperature
- protecting the sensor against soiling
- the need to remove the probe without interrupting the process.
To obtain a representative sample of the process gas and to avoid measuring errors,
please note the following:
- Differences in pressure between the process and the sampling chamber will result in s
ignificant measuring errors!
- Measurements at low dew point temperatures are sensitive to humidity penetrating from
the environment due to leaks.
The sampling system must therefore be pressure-tight.
- No hygroscopic materials must be used!
- The sampling line should be as short as possible.
- The response time increases if the gas flow is < 1 l/min (0.25 gpm).
- If the gas flow is too low, this can result in back-diffusion of humidity from the
environment and distort the measurement.
4.

ELECTRICAL CONNECTIONS

Analogue output:
4 3
2
1
Step 1:
Install the probe with the stop valves closed.
It is not permitted to use a sealing ring with a NPT 1/2" thread.
Appropriate PTFE sealing tape or sealant should be
used instead.
Step 2:
Insert the probe into the process and screw it as tight as
possible by hand.
Step 3:
If there is a sealing ring, check it for correct centring
and tighten the screw connection with a torque of 30 Nm.
Male connector
1...V+
2...output 1
3...GND
12