Burkert 8326 User manual

443879 - Ind** / Jul 00
Pressure Transmitter
T
y
pe 8326
Instruction Manual
S - Nr.2312093

Pressure Transmitter 8326
Contents
Subject to technical chan
g
es without notice.
GB-1
Contents
1 General Safety Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
2 Product Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.1 Construction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.1.1 Pressure Transducer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.1.2 Control Interface Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
2.1.3 Displa
y
Unit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
2.2 Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.2.1 Functions of Devices without Displa
y
s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.2.2 Functions of Devices with Displa
y
s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.3 Installation Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3 Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.1 Input-values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.2 Output-values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.3 Construction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.4 Auxilliar
y
Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.5 Ambient Conditions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.6 Process Conditions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.7 Identification Plates. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.1 Pressure Transmitter Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.2 Displa
y
Unit Up
g
rades . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.3 Housin
g
Reconfi
g
uration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.4 Electrical Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.5 Pressure Compensation when usin
g
a Relative Pressure Sensor. . . . . . . . . . . . 14
5 Operation of Devices without Displays. . . . . . . . . . . . . . . . . . . . . . . 15
5.1 Preparation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.2 Ke
y
Functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.3 Calibration with Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.3.1 Zero Point Calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.3.2 Span Calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.4 Calibration without Pressure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5.4.1 Zero Point Calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5.4.2 Span Calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5.5 Inte
g
ration Time
(
Dampenin
g)
Ad
j
ustment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
5.6 Reset to Default . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Pressure Transmitter 8326
Contents
Subject to technical chan
g
es without notice. GB-2
6 Operation of Devices with Displays. . . . . . . . . . . . . . . . . . . . . . . . . . 20
6.1 The Displa
y
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
6.2 Ke
y
Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
6.3 The Pro
g
rammin
g
Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
6.4 Default Data
(
factor
y
settin
g)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
6.5 Main Menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
6.5.1 Main Menu: Displa
y
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
6.5.2 Main Menu: Calibration of zero and span
(
with / without pressure
)
. . . . . . . . . . . 26
6.5.3 Main Menu: Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
6.5.4 Main Menu: Evaluation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
6.5.5 Main Menu: Lan
g
ua
g
e. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
6.5.6 Main Menu: Service. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
7 Diagnostics and Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
8 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
9 Appendix. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
9.1 Dimension Dia
g
rams. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
9.2 Warrant
y
Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
9.3 Glossar
y
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
9.4 Units of Pressure Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
1 General Safety Instructions
Observe the national regulations about safety and accident prevention , as
well as the safety instructions in this operating manual when operating the
pressure transmitter.
Any operation not described in the following instructions must not be car-
ried out.
If a failure cannot be repaired, the transmitter must be switched off.The op-
erator then must make sure, that it is only switched on again after the fail-
ure has been repaired.
Repairs should only be carried out by the manufacturer. All other repairs or
modifications of the transmitter are unauthorized.
Other important safety guidelines can be found in the different sections of
this instruction manual.
Warnin
g
Warnin
g
Attention
Attention

Pressure Transmitter 8326
Product Description
Subject to technical chan
g
es without notice.
GB-3
2 Product Description
The 8326 pressure transmitter can be used in level control applications as well as for
pressure measurement applications in process industr
y
. A variet
y
of process connec-
tions, measurement ran
g
es, main boards and displa
y
options result in a product for a
wide ran
g
e of applications.
2.1 Construction
The 8326 consists of a pressure sensor, a control interface unit and a housin
g
cover
with optional displa
y
. Due to this modular desi
g
n, different transmitter versions can be
mounted.
2.1.1 Pressure Transducer
The pressure transducer has a piezo-resistive or thinfilm measurement cell depend-
in
g
on the pressure ran
g
e. The sensors are temperature compensated, and have a
hermeticall
y
welded membrane which is "helium" leak-tested. The Pressure transduc-
ers do not have internal sealin
g
elements.
Pressure transducers further distin
g
uish themselves from one another based on their
pressure ran
g
es and the different materials of wetted parts. Different process connec-
tions can be selected to serve a wide ran
g
e of applications.
2.1.2 Processing Unit
The processin
g
unit, which is inte
g
rated in the housin
g
contains the terminal compart-
ment and the ke
y
pad used for pro
g
rammin
g
the transmitter. The four ke
y
s must be
activated
(
unlocked
)
before use. Durin
g
normal operation the ke
y
pad is locked to pro-
tect data and functions previousl
y
entered. The ke
y
pad is automaticall
y
locked when
no ke
y
is hit for 10 minutes. The processin
g
unit converts the di
g
italized si
g
nal from
the measurin
g
unit into a standard 4...20 mA current si
g
nal.
Direct Mounted Processing Unit Housing

Pressure Transmitter 8326
Product Description
Subject to technical chan
g
es without notice. GB-4
2.1.3 Display Unit
The measured-value indicator has four di
g
its
(
in a 7-se
g
ment displa
y)
+ s
y
mbols. Be-
low it, is line 1
(
16-se
g
ment displa
y)
used to displa
y
error codes and the si
g
nal’s unit
of measure. The unit of measure can be selected b
y
the operator.
Additionalinformationis displa
y
ed in lines 2and 3
(
16-se
g
mentdispla
y)
.The operator
can enter commands in the pro
g
rammin
g
mode on the displa
y
unit b
y
means of menu
g
uided, clear-text prompts.
Transmitters with displa
y
s offer a lar
g
er number of pro
g
rammin
g
and processin
g
op-
tions. These options include alarm status, dampin
g
, si
g
nal inversion, tank lineariza-
tion and dia
g
nostic messa
g
es.
Display units can be easily upgraded (see Section 4.2).
Processing Unit
CALIBRATION
RANGE

Pressure Transmitter 8326
Product Description
Subject to technical chan
g
es without notice.
GB-5
2.2 Function
The mode of operation for si
g
nal conversion works in the same wa
y
for all versions.
The pressure transducer converts the existin
g
pressure into an electrical si
g
nal. Mi-
croelectronics further process the input si
g
nal and produce a proportional 4-20 mA
standard si
g
nal.
The displa
y
-version allows pro
g
rammin
g
(
parameterization
)
and the displa
y
of ex-
tended functions such as inversion, dampin
g
, alarm status and linearization.
2.2.1 Functions of Transmitters without Displays
•Calibration of zero and span under pressure
(
see 5.3
)
•Calibration of zero and span without pressure
(
dr
y
ad
j
ustment
)
(
see 5.4
)
•Settin
g
the dampenin
g
/ inte
g
ratin
g
the output si
g
nal 0-40 s
(
see 5.5
)
•Reset to manufacturer’s default values
(
see 5.6
)
2.2.2 Functions of Transmitters with Displays
•Settable units of measurement
(
mbar, bar, psi, mA, %, m, mm WS
)
(
see 6.5.1
)
•Temperature and Min/Max values shown in displa
y
(
see 6.5.1
)
•Nominal pressure ran
g
e of the sensor shown in displa
y
(
see 6.5.1
)
•Zero and span calibration
(
with/without pressure
)
(
see 6.5.2
)
•Settin
g
of dampin
g
/ inte
g
ration of output si
g
nal 0-40 s
(
see 6.5.3
)
•Inversion of the output current si
g
nal
(
see 6.5.3
)
•Settin
g
the output current value in case of alarm
(
3.6 mA or 21 mA
)
(
see 6.5.3
)
•Settin
g
the limits of the output si
g
nal
(
see 6.5.3
)
•Offset of the output si
g
nal
(
see 6.5.3
)
•Mountin
g
correction of the sensor
•Measurin
g
circuit test function
(
see 6.5.6
)
•Reset functions
(
see 6.5.6
)
•Password activation
(
see 6.5.6
)
•Selectin
g
the lan
g
ua
g
e of the displa
y
(
see 6.5.5
)
•Enterin
g
of a table function for the linearization of the output si
g
nal
(
see 6.5.4
)
•Enterin
g
the medium densit
y
(
see 6.5.4
)

Pressure Transmitter 8326
Product Description
Subject to technical chan
g
es without notice. GB-6
2.3 Installation Examples
The 8326 is primaril
y
used to monitor the pressure in pipes, technical e
q
uipment and
tanks. Dependin
g
on the pressure ran
g
e pressures between 20 mbar up to 1000 bar
can be measured. The pressure is measured usin
g
absolute
(
a
g
ainst a vacuum
)
or
relative
(
a
g
ainst external or air pressure
)
measurement dependin
g
on the t
y
pe of sen-
sor selected.
The 8326 is also used for h
y
drostatic pressure measurement within li
q
uid filled pipes
and containers.
Process Pressure Measurement: Process Pressure Measurement:
Used to measure pressure of liquids Used to measure container pressure.
or gases in pipelines.
Process Pressure Measurement: Process Pressure Measurement:
Installed behind feed pumps for Installed in front of and behind the filter.
process control or monitoring of pump Uses the pressure differential for moni-
functions. toring the function or accumulation of dirt
in the filter. Both output signals are pro-
cessed by a PLC or signal converter.

Pressure Transmitter 8326
Product Description
Subject to technical chan
g
es without notice.
GB-7
Level Control: Level Control:
Externally mounted Combined pressure and head pressure
(with front flat diaphragm) are measured by two externally mounted
pressure transducers. The two signals
are anylized and the differential is cal-
culated by a PLC or suitable signal con-
verter.
Level Control: Level Control:
Rope type suspended from top of tank. Rod type installed through top of tank.

Pressure Transmitter 8326
Technical Data
Subject to technical chan
g
es without notice. GB-8
3 Technical Data
3.1 Input-values
3.2 Output-values
Pressure Ran
g
es
(
Absolute pressure upon re
q
uest
)
/ overpressure limit / Burst pressure
0 ... 0.4 bar 2 2
0 ... 1,6 bar 10 10
0 ... 6 bar 35 35
0 ... 16 bar 80 80
0 ... 40 bar 80 400
0 ... 100 bar 200 800
0 ... 250 bar 500 1200
0 ... 600 bar 1200 2400
0 ... 1.000 bar 1500 3000
others ... 1.000 bar
Output si
g
nal 4 ... 20 mA
Accurac
y
[
% of span
]
(
linearit
y
, h
y
steresis, repeatabilit
y)
< 0.10 at ran
g
es of > 40 bar
< 0.15 at ran
g
es of < 40 bar
Turn down behavior:
(
1/k
)
up to 1 : 5
1 : 5 to 1 : 20 no chan
g
es of deviation
the accurac
y
must be multiplied b
y
the
factor
(
turn down / 5
)
example for TD = 1:15,
(
k = 15
)
accurac
y
= 0.10 *
(
15/5
)
= 0.3
Overall deviation
(
at +10 °C ... +40 °C
)
<0.15 % for pressure ran
g
es of > 40 bar
(
limit point calibration
)
< 0.2 % for pressure ran
g
es of < 40 bar
Load RA<
(
UB–12 V
)
/0.023 A
with RAin Ohm and UBin Volt
Fault si
g
nal 3.6 mA or 21 mA, pro
g
rammable
Inte
g
ration time 0s,1s,5s,20s,40s,pro
g
rammable
Ad
j
ustment of the span Up to Turn Down 1 : 20
Inte
g
rated li
g
htnin
g
protection optional
Zero point ad
j
ustment 0 ... 99 %

Pressure Transmitter 8326
Technical Data
Subject to technical chan
g
es without notice.
GB-9
3.3 Construction
3.4 Auxilliary Power
3.5 Ambient Conditions
Process connections G 1/2 B per DIN 16288
(
1/2 NPT
)
G 1/2 B flush diaphra
g
m with O-Rin
g
(
Ran
g
es:
0 ... 6 to 0 ... 600 bar
)
G 1 B flush diaphra
g
m with O-Rin
g
accordin
g
to EHEDG
Materials
Housin
g
wetted parts:–standard
–with a flush
diaphra
g
m
–EHEDG
Internal transmission fluid
hi
g
hl
y
resistive, fiber
g
lass-enforced plas-
tic
(
PBT
)
CrNi-steel 1.4571
(
316 Ti
)
and 1.4542
(
630 17.4 PH
)
CrNi-steel 1.4571
(
316 Ti
)
and O-Rin
g
:
FPM
CrNi-steel 1.4435
(
316 L
)
and O-Rin
g
:
EPDM
–Standard
–EHEDG-version is FDA approved
Electrical connection
per EN 60 529/ IEC529 M 20 x 1.5 cable
g
land with internal ter-
minal block
(
see 4.4
)
Electric protection Reverse polarit
y
, overload and short cir-
cuit protection
Power suppl
y
12 ... 36 V DC
Ambient temperature –40 °C ... + 85 °C
(
–20 °C ... 70 °C with displa
y)
Stora
g
e temperature –40 °C ... + 85 °C
(
–35 °C ... 80 °C with displa
y)
Climate class D per DIN IEC 654-1
In
g
ress protection per EN 60 529 IP 65
(
IP 67 upon re
q
uest
)
EMC per EN 50 081-2, EN 50 082-2,
NAMUR NE 21

Pressure Transmitter 8326
Technical Data
Subject to technical chan
g
es without notice. GB-10
3.6 Process Conditions
3.7 Identification Plates
Medium temperatures –30 °C ... + 100 °C
Max. wash-down temperatures 120 °C
The transmitter must not be subjected to the wash-down temperature for
more than 10 minutes at a time! A maximum wash-down temperature of
105°C is allowed for devices installed in hazardous areas.
(°F = (°C *1.8) + 32)
Attention
:Ausgangsignal / Output signal / Signal de sortie
:Hilfsenergie / Power supply / Alimentation
S # :Serien-Nr / Serial No / N°de Série
0 ... 16 bar
4 ... 20 mA
DC 12 ... 36 V L+ L–
S# 3005925
Transmitter 8326 / ID. No. 443283S
Bürkert
OK
Artikel-Nr / ID-No / Code Ident.

Pressure Transmitter 8326
Installation
Subject to technical chan
g
es without notice.
GB-11
4 Installation
The device should be installed/operated in accordance with the re
g
ulations of ElexV,
the Device Safet
y
Re
g
ulation, this operatin
g
manual and
g
enerall
y
reco
g
nized indus-
tr
y
standards.
4.1 Pressure Transmitter Installation
Installation Using a Weld-on Adapter:
•Insert a filler piece
(
a pressure transmitter dumm
y)
into the weld-on adapter.
•Weld the adapter into the container/pipe wall
(
section-weld process
)
.
•Remove the filler piece.
•Install the pressure transmitter in the weld-on adapter.
4.2 Display Unit Upgrades
The displa
y
unit can be easil
y
up
g
raded at an
y
time.
•Remove the housin
g
cover and the supportin
g
strin
g
.
•Attach the displa
y
unit’s supportin
g
strin
g
to the same place.
•Plu
g
the displa
y
unit’s connector into the appropriate
j
ack.
The displa
y
unit can be mounted at 90°an
g
les.
•Fasten the displa
y
unit with screws.
The pressure transmitter’s diaphram should not come into contact with
hard or sharp objects.
When installing the display unit, make sure that the connection cable
and the supporting string are not kinked or pinched. If the cable is
damaged, correct function may be impaired.
On EX-Model the Ex-protection of the transmitter will no longer exist.
Attention
Attention

Pressure Transmitter 8326
Installation
Subject to technical chan
g
es without notice. GB-12
•
All functions are pro
g
rammable once the pressure transmitter has been up
g
raded
with a displa
y
unit. The ad
j
usted parameters are stored after the displa
y
unit is re-
moved.
The displa
y
unit canbe rotated in 300°, sothat it can beread under various installation
conditions. The housin
g
cover with built-in displa
y
can be fastened to the housin
g
at
all four side positions.
4.3 Housing Reconfiguration
Rotate the housin
g
of the displa
y
unit in order to be able to read the displa
y
from
above when the pressure transmitter is installed in an upri
g
ht position.
•Loosen the 4 internal hexa
g
onal screws.
•Li
g
htl
y
lift off the housin
g
with the displa
y
unit.
•Carefull
y
turn the housin
g
b
y
180°.
•Re-ti
g
hten the screws.
When tightening the 4
hollow screws,
make sure that they are ade-
quately and securely seated in order to ensure that the transmitter is
properly sealed.
Connection Cable
Supporting String
Attention

Pressure Transmitter 8326
Installation
Subject to technical chan
g
es without notice.
GB-13
4.4 Electrical Connection
The suppl
y
volta
g
e is between 12 and 36 V DC
(
12 and 30 V for intrinsic safet
y
trans-
mitters
)
. The power suppl
y
and the output si
g
nal are transmitted via a two-wire cable
(
max. 12 mm outer diameter, max. 14 AWG
)
and connected in accordance with the
pin confi
g
uration.
Suppl
y
volta
g
e can be supplied b
y
a power unit, a transmitter power suppl
y
or b
y
means of a PLC connection.
It is su
gg
ested to use a model with inte
g
rated li
g
htnin
g
protection for preventin
g
dam-
a
g
e due to volta
g
e peaks.
Please observe local installation regulations (Germany: VDE-Standard).
The terminal voltage should not exceed 36 V (30 V for intrinsic safety
transmitters).
Attention

Pressure Transmitter 8326
Installation
Subject to technical chan
g
es without notice. GB-14
Terminal Configuration
Ground
L- Ne
g
ative
L+ Positive
I Test circuit; connect the ampere meter between terminals L+ and I
The unit must be properl
y
g
rounded in order to
g
uarantee EMC resistance.
4.5 Pressure Compensation when using a Relative Pressure Sensor
A Goretex diaphra
g
m is used to compensate for the atmospheric pressure under the
IP 65 Protection Method.
A special cable with capillaries for relative pressurization is used for In
g
ress Protec-
tion IP 67.

Pressure Transmitter 8326
Operation of Devices without Displays
Subject to technical chan
g
es without notice.
GB-15
5 Operation of Devices without Displays
5.1 Preparation
This unit can be pro
g
rammed before or after installation.
•Connect an ampere meter to the device’s output
(
between terminals I and L+
)
.
•Note that after each action, a brief oscillation/deflection of 20 mA occurs
(
verifica-
tion of a successful action
)
.
The followin
g
functions can be pro
g
rammed without a displa
y
unit:
•Zero point ad
j
ustment with a full or empt
y
container
(
with/without pressure
)
•Span ad
j
ustment with a full or empt
y
container
(
with/without pressure
)
•Inte
g
ration time
•Reset to manufacturer’s defaults
5.2 Key Functions
An error signal is caused by a current surge (21 mA or 3.6 mA; 5 sec) when
the zero point or span setting fall outside of the sensor’s nominal pressure
range during adjustments with existing pressure. No values are stored.
The keypad becomes inactive after 10 min. of disuse. All settings will de-
fault to previously stored values. Only settings that have been confirmed
with the "OK" function are stored.
Function 1 Function 2
Basic settin
g
,
store span Action: upward, increase value
Basic settin
g
,
store zero point Action: downward, decrease value
Exit ke
y
or pro-
g
rammin
g
mode Activate ke
y
s
(
push simulta-
neousl
y
for 2 sec.
)
Verification
(
store
)
Basic settin
g
Inte
g
ration time/
dampin
g
(
push
simultaneousl
y
for
2 sec.
)
Reset to default
(
push simulta-
neousl
y
for 2 sec.
)

Pressure Transmitter 8326
Operation of Devices without Displays
Subject to technical chan
g
es without notice. GB-16
5.3 Calibration with Pressure
5.3.1 Zero Point Calibration
5.3.2 Span Calibration
Calibration of the measurement ran
g
e
(
span
)
.
Make sure that the pressure to be used as the zero point (P 0 %), is
present at the transmitterer diaphragm before calibration.
Make sure that the pressure to be used as the span end-point (P 100 %) is
present at the transmitter diaphragm.
A change in the zero point has no effect on the calibrated span.
However, if the span end-point is higher than the peak value of the sen-
sor’s nominal pressure range, then span end-point is fixed at this peak val-
ue and the span is reduced accordingly.
A change in the span setting has no effect on the zero point. The zero point
and span end-point must fall within the sensor’s nominal pressure range.
meas
Zero point calibration
Calibration Value
Set
Value
meas
Calibration of span
Calibration Value
Set
Value

Pressure Transmitter 8326
Operation of Devices without Displays
Subject to technical chan
g
es without notice.
GB-17
5.4 Calibration without Pressure
Determine the current reference values for the zero point and the span to be entered
in the transmitter before calibration. This is done as follows:
5.4.1 Zero Point Calibration
•Determine the h
y
drostatic pressure of the li
q
uid’s surface that meets the zero point.
•Ad
j
ust this pressure in proportion to the sensor’s nominal pressure ran
g
e.
•Multipl
y
this proportion b
y
16 mA and add 4 mA to the result.
This produces the calculated current
(
value Icalc
)
, which is entered in the transmitter
and used to pro
g
ramm the zero point
(
0%
)
.
Example:
A pressure transducer with 0 ... 400 mbar
(
nominal pressure
)
needs to be pro-
g
rammed.The li
q
uid’s surface
(
with a densit
y
of 1
)
is 1 m above the diaphra
g
m at the
zero point producin
g
a pressure of 100 mbar.
This means that the device’s current value must be set to 8 mA when performin
g
a dr
y
(
empt
y)
calibration.
5.4.2 Span Calibration
•Determinethe h
y
drostaticpressureoftheli
q
uid’ssurface, which corresponds to the
span end-point.
•Calculate the difference of the pressure value between span end-point and zero
point and divide this difference b
y
the nominal pressure ran
g
e of the sensor.
•Multipl
y
this proportion b
y
16 mA and add 4 mA to the result.
This produces the calculated current
(
value Icalc
)
, which is entered in the transmitter
and used to pro
g
ram the span end-point
(
100%
)
.
The measurement ran
g
e between zero point and span end-point will be stored as
span.
I
calc
Zero point pressure
(
0%
)
100 mbar
Sensors nominal pressure 400 mbar
------------------------------------------------------------------------------------------------ 16 mA 4 mA
+
⋅8 mA
==
Calibration Value
calc
Calibration of zero point, without display, without pressure
Calibration Value
... to I
meas
= I
calc
... to I
meas
= I
calc
Set
Value

Pressure Transmitter 8326
Operation of Devices without Displays
Subject to technical chan
g
es without notice. GB-18
Example:
A pressure transducer with 0 ... 400 mbar
(
nominal pressure
)
is to be pro
g
rammed.
The li
q
uid’s surface
(
with a densit
y
of 1
)
is 1 m above the diaphra
g
m at the zero point.
The maximum
(
span end-point
)
should be 3 m.
This means that the output must be set to 12 mA durin
g
pro
g
rammin
g
.
A change in the zero point has no effect on the adjusted span.
However, if the span end-point is higher than the peak value of the
sensor’s nominal pressure range, then the span end-point is fixed at
this peak value and the span is reduced accordingly.
A change in the span setting has no effect on the zero point. The zero
point and span end-point must fall within the sensor’s nominal pres-
sure range.
A test / correction of the zero point is suggested after adjusting the
span in order to maintain optimum accuracy.
I
calc
pressure difference (span) (300 mbar -100 mbar)
Sensors nominal pressure 400 mbar
--------------------------------------------------------------------------------------------------------------------------------
--
16 mA 4 mA
+
⋅
12 mA
==
Access
Function
... to Imeas = Icalc
Activate
Keypad
(2 s)
Calculate
Calibration Value
Calibration of span, without display, without pressure current value decreases
Confirm
Calibration Value
... to Imeas = Icalc
current value increases
Icalc =
Set
Value
Important

Pressure Transmitter 8326
Operation of Devices without Displays
Subject to technical chan
g
es without notice.
GB-19
5.5 Integration Time (Damping) Adjustment
The followin
g
inte
g
ration time settin
g
s can be used: 0, 1, 5, 20 and 40 s.
The sensor’s measured values can then be avera
g
ed usin
g
the ad
j
usted inte
g
ration
time.
5.6 Reset to Default
All default data settin
g
s are restored b
y
simultaneousl
y
pressin
g
the "zero", "esc" and
the "ok" buttons for 2 seconds
(
see Para. 6.4
)
.
Calibrated special measurement ranges i. e. 4 bar on a 6 bar transmit-
ter can be adjusted by factory pre-setting. A reset to default will reset
the sensor back to its nominal range (i. e. 6 bar). The factory pre-setting
gets lost.
Calibration Value Calibration Value
Calibration of the integration time
et
Value
Important