Baumer Flex Bar HRT - Manual (Page 4)

Page 4 Design and specifi cations subject to change without notice
Installation Manual www.baumerprocess.com
Installation
Unpacking the transmitter
If the transmitter is visibly damaged, it should not be put into operation.
Mechanical installation and cleaning
The pressure diaphragm must not be touched during installation.
Cleaning with pressurised cleaners and tools may damage the
diaphragm (Fig.1).
Precautions prior to the installation:
If the transmitter has a 1/2" threaded neck, check before mounting
in a blind hole that the thread length is at least 22 mm (Fig.2). Use
a gasket ø28.6 x ø21.5 mm, made from a material proof against the
measuring medium, and do the clamping with an NV27 mm engineer's
wrench. FlexBar HRT can be mounted on a Baumer pressure gauge
connection type no. 81 26-92X (see data sheet).
For a correct 3A installation refer to page 7.
Mounting the pressure transmitter in closed systems (e.g. a stop cock)
can create over pres su re in excess of that permit ted (400%), which
could deform the diaphragm and damage the pressure sensor.
The transmitter must not be exposed to pressure or surge exceeding
4 x span, max. 600 bar though.
The freezing point of process media and condensates must be
checked to prevent unintentional pressure rise when it is freezing.
Radiated heat may create excessively higher opera ting tempera tures
than the allowed -10...70°C (14...154°F).
Installation procedure
a) Remove protection-cap.
b) Install FlexBar.
(G1/2A versions: Tighten up at 20 Nm.)
c) Confi gure Span by the FlexProgrammer or a HART
confi
gurator.
d) Connect the power supply, press and hold the Auto Zero button
or use the facility in the FlexProgrammer or the HART confi gurator.
Adjusting the zero point
With FlexBar HRT the electronic zero point can be adjusted from
-10...10% of the total measuring range.
The correct zero point pressure must be established prior to adjust-
ing the zero point. Tank and pressure transmitter must have the same
temperature. If the pressure trans mit ter has a relative measuring cell
from 0 bar, the zero point pressure is the same as the atmospheric
pressure or the level in a tank selected as zero point level. A pressure
transmitter measuring absolute pressure has a zero point lower than 1
mbar abs.
When the required zero point pressure has been established, the Zero
push button inside FlexBar must be pressed and held. The LED will
respond with one blink per second. When the actual zero pressure
level has been stored in the memory of the FlexBar the LED will blink
twice a second.
You can revert to the zero point correction set by Baumer by reconfi g-
uring the FlexBar HRT with the FlexProgrammer.
The pressure transmitter can change zero point slightly, owing to
mechanical tension
and the fi tting direction selected for the pressure diaphragm. Optimal
results are therefore achieved if the zero point is adjusted after the
pressure transmitter has been mounted in place.
Electrical installation
Suitable cables should be used to secure maximum tightness in the
gland. For models having a plug for electrical connection the inner part
of the plug must be oriented in a way so that the opening is turning
downwards (Fig4).
To avoid measuring errors resulting from insuffi cient supply voltage,
the transmitter must be supplied with min. 6.5 V
dc
at 23 mA.
The transmitter has a high immunity against high-frequency interfer-
ence. In environments with a high radiation we recommend to use
screened and twisted cable (Fig. 3).
Disposal of product and packing
According to national laws or by returning to Baumer
None of the two types of FlexProgrammer confi guring unit must be
connected to the FlexBar HRT within the hazardous area.
Confi guring procedure:
a) Disconnect mains from the 4...20 mA loop circuit.
b) Disconnect the FlexBar HRT from the circuitry within
the hazardous area.
c) Uninstall and bring the FlexBar HRT to the safe area.
d) Connect the FlexProgrammer and perform the
confi
guring session.
e) Re-install the FlexBar HRT in the hazardous area.
f) Connect the power supply to the circuit.
Confi guration of the FlexBar HRT can be made within the hazardous
area by means of the handheld confi gurator model 275, providing the
precautions and guidelines described in the product´s manual are
observed.
Ex-Confi guring Warnings
WARNING
This product contains no replaceable parts.
In case of malfunction the product must be shipped to Baumer for
repair.
WARNING
Products with painted and/or plastic surfaces (e.g. display) imply a risk
of electrostatic charging.
To prevent electrostatic hazard - do only clean with a moist cloth.
After mounting the device - do check that the housing has a ground
potential.