Quick Start Guide
00825-0100-4327, Rev 02
August 2020
Rosemount™ 326P Pressure Transmitter
Quick Start Guide August 2020
Contents
Introduction.................................................................................................................................3
Installation................................................................................................................................. 10
Operation...................................................................................................................................14
Setting ranges............................................................................................................................35
Troubleshooting........................................................................................................................ 43
Product certifications................................................................................................................. 45
Factory settings..........................................................................................................................46
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1 Introduction
The pressure transmitter measures and monitors pressure in a facility.
1.1 Pressure specifications
To ensure product performance and safety, adhere to the following
specifications.
1.1.1 Measuring range
This table shows the range at which the pressure transmitter is able to
measure pressure.
Pressure range Measuring range limits
inH2O mbar
1A -2.0 to 40 -5 to 99.5
2A -5.0 to 100 -12.4 to 248.8
psi bar
3A -14.5 to 14.5 -1 to 1
2B -0.73 to 14.5 -0.05 to 1
4A -1.45 to 20 -0.1 to 1.38
5A -1.8 to 36 -0.124 to 2.48
6A -14.5 to 55 -1 to 3.79
7A -14.5 to 85 -1 to 5.86
8A -14.5 to 145 -1 to 10
9A -14.5 to 230 -1 to 15.9
1B -14.5 to 360 -1 to 24.8
Note
The pressure transmitter is vacuum resistant. There are restrictions for
nominal pressure ranges at or below 4.35 psi (300 mbar). Adhere to the
specifications in the data sheet.
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1.1.2 Overpressure limits
The table in this topic shows maximum allowable pressure for the pressure
transmitter.
CAUTION
Take appropriate measures to avoid exceeding the specified overpressure
limits.
Pressure range Overpressure limits
inH2O bar
1A 1606 4
2A 2400 6
psi bar
3A 145 10
2B 145 10
4A 215 15
5A 290 20
6A 435 30
7A 435 30
8A 725 50
9A 1085 75
1B 1450 100
1.1.3 Burst pressure limits
The burst pressure limit is the pressure at which the pressure transmitter will
no longer function or be damaged.
CAUTION
Do not exceed the burst pressure limit. Exceeding the burst pressure limit
can damage the pressure transmitter. Continuing to use the pressure
transmitter after exceeding the burst pressure limit can cause damage and
physical injury.
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Pressure range Burst pressure limits
inH2O bar
1A 12044 30
2A 12044 30
psi bar
3A 435 30
2B 435 30
4A 580 40
5A 725 50
6A 1450 100
7A 1450 100
8A 2175 150
9A 3625 250
1B 5075 350
1.2 Operating modes
The wiring configuration sets the operating mode. After wiring the pressure
transmitter, it automatically recognizes the connections and changes to the
respective operating mode.
For more information, see Electrical connection.
1.2.1 Two-wire operation
OUT2 (pin 2)
The analog signal proportional to pressure (4-20 mA or 20-4
mA).
1.2.2 Three-wire operation
OUT1 (pin 4)
OUT2 (pin 2)
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Switching signal for system pressure limit value
• Switching signal used for system pressure limit value
• Analog signal proportional to pressure (4-20 mA or 20-4
mA)
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1.3 Functions
The Rosemount 326P Pressure transmitter performs the functions described
in this section.
1.3.1 Switching function
The switching function is available only for three-wire operations. OUT1 or
OUT2 changes its switching status if the pressure is above or below the set
switching limits (SPx, rPx). These switching functions are available:
• Hysteresis function/normally open: OUx = Hno (Figure 1-1)
• Hysteresis function/normally closed: OUx = Hnc (Figure 1-1)
First set the set point (SPx), then the reset point (rPx) with the requested
difference.
• Window function/normally open: OUx = Fno (Figure 1-2)
• Window function/normally closed: OUx = Fnc (Figure 1-2)
Set the width of the window using the difference between SPx and rPx.
SPx is the upper value and rPx is the lower value.
Figure 1-1: Hysteresis function
• SP: Set point
• rP: Reset point
• P: Pressure
• Hy: Hysteresis
• Hno: Hysteresis function/normally
open
• Hnc: Hysteresis function/normally
closed
Figure 1-2: Window function
• FE: Window
• Fno: Window function/normally
open
• Fnc: Window function/normally
closed
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1.3.2 Analog signal
The transmitter communicates measured pressure using an analog signal.
OU2 defines whether the set measuring range is provided as 4-20 mA (OU2
= I) or as 20-4 mA (OU2 = InEG).
Rerange the transmitter (set new values for ASP and AEP) by either manually
entering range points or with an applied pressure source.
• Applying a pressure source for the analog start point (tASP) or manually
setting the parameter (ASP) defines the measured value when the
analog signal is 4 mA (20 mA at InEG).
• Applying a pressure source for the analog end point (tASP) or manually
setting the parameter (ASP) defines the measured value when the
output signal is 20 mA (4 mA at InEG).
Minimum distance between ASP and AEP is 25 percent of the upper range
limit (maximum rangedown 4:1). For pressure range 3A, the minimum
distance is 25 percent of the measuring span.
Figure 1-3: Factory setting
Figure 1-4: Transmitter reranged
P: system pressure
MAW: initial value of the measuring range (Lower range limit [LRL])
MEW: final value of the measuring range (Upper range limit [URL])
1: OU2 = I
2: OU2 = InEG
In the set measuring range the output signal is between 4 and 20 mA (OU2 =
I) or between 20 and 4 mA (OU2 = InEG). When pressure is outside the set
measuring range, the output signal is as follows:
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• System pressure above the measuring range:
— Output signal > 20 mA if OU2 = I.
— Output signal 4 to 3.8 mA if OU2 = InEG.
• System pressure below the measuring range:
— Output signal 4 to 3.8 mA if OU2 = I.
— Output signal > 20 mA if OU2 = InEG.
1.3.3 Customer-specific calibration (sensor trim)
A customer specific calibration (sensor trim) corrects the pressure offset and
pressure range to match a pressure standard. This provides a slope
correction to the transmitter's current characterization curve. An accurate
pressure standard is required for a full calibration. For more information on
performing a Sensor Trim, see Perform a sensor trim.
• Sensor Trim is a two-point sensor calibration that applies two end-point
pressures (CP1, CP2) then linearizes the output between them. CP1 and
CP2 must be within the scaled measuring range. For more information,
see Analog signal.
• Zero trim is a single-point offset adjustment. It compensates for
mounting position effects and is most effective when performed with
the transmitter installed in its final mounting position. Since zero trim
maintains the slope of the characterization curve, do not use it in place
of a Sensor Trim over the full sensor range. For more information, see
Perform manual zero trim.
Reset the calibration by resetting all parameters to the factory default
settings. For more information, see Resetting all parameters to factory
default settings.
P: measured pressure
•
P‘: modified measured value
• CP1: calibration point 1
CP1‘: modified measured value for
CP1
• CP2: calibration point 2
• 1: curve of measured values at
factory setting
• 2: curve of measured values after
calibration
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• P: measured pressure
P‘: modified measured value
• CP1: calibration point 1
CP2: calibration point 2
CP2‘: modified measured value for
CP2
• 1: curve of measured values at
factory setting
• 2: curve of measured values after
calibration
• P: measured pressure
P‘: modified measured value
• CP1: calibration point 1
CP1‘: modified measured value for
CP1
• CP2: calibration point 2
CP2‘: modified measured value for
CP2
• 1: curve of measured values at
factory setting
• 2: curve of measured values after
calibration
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2 Installation
This section contains instructions for installing and wiring the Rosemount
326P Pressure Transmitter.
Note
Before installing or removing the unit, ensure no pressure is applied to the
system. Note that when the pressure transmitter displays 0%, pressure
might still be applied to the system.
2.1 Installation orientation (3-A® standards)
For optimized cleaning of the measuring element in hygienic areas
according to the 3-A standards, follow these guidelines when installing the
pressure transmitter.
To ensure the medium can run off the measuring element, do not install the
unit at the lowest point of a pipe or container.
Note
This product is not suitable for use where the criteria for paragraph E1.2 /
63-03 of the 3-A® standard 63-03 must be met.
2.2 Installing with EHEDG standards
CAUTION
The unit is suited for CIP (cleaning in process) when installed correctly.
• Observe the application limits (temperature and material resistance)
according to the data sheet.
• Ensure the sensor is integrated into the system according to EHEDG:
— Use self-draining installation.
— Only use process adapters permitted according to EHEDG with
special seals required by the EHEDG position paper.
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CAUTION
The gasket of the system interface must not be in contact with the sealing
point of the sensor.
• In case of structures in a tank, the installation must be flush mount. If not
possible then direct water jet cleaning and cleaning of dead spaces must
be possible.
• Leakage ports must be clearly visible and must be installed facing
downwards for vertical pipes.
• To avoid dead space, adhere to the dimensions: L < D.
A. Leakage port
2.3
2.4
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Hygienic process connection adapter installation
Hygienic process connection adapters allow the transmitter to be installed
according to application requirements. All connection adapters include an
EPDM O-ring. More sealing rings are available to be ordered as accessories.
See the Rosemount 326P Product Data Sheet for all available connectors and
accessories. Hygienic process connection adapters include installation
instructions with the packaging.
Electrical connection
This section provides instructions for wiring the pressure transmitter. A
qualified electrician must wire the pressure transmitter. The electrical
installation must adhere to national and international regulations.
Voltage supply according to EN 50178, SELV, PELV.
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2.4.1 Wiring for two-wire operation
Follow these steps to wire the pressure transmitter for two-wire operation.
Procedure
1. Disconnect the power.
2. Wire the pressure transmitter according to Figure 2-1.
Figure 2-1: Connection for two-wire operation
BN Brown
WH White
OUT Analog output (4-20 mA)
Colors to DIN EN 60947-5-2
2.4.2 Wiring for three-wire operation
Follow these steps to wire the pressure transmitter for three-wire operation.
Procedure
1. Disconnect the power.
2. Wire the pressure transmitter according to Figure 2-2.
Figure 2-2: Connection for three-wire operation
BK
BN Brown
BU Blue
WH White
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Black
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OUT1 Switching output
OUT2 Switching output or analog output
(4-20 mA)
Colors to DIN EN 60947-5-2
Wiring examples
2 x positive switching 2 x negative switching
1 x positive switching / 1 x analog 1 x negative switching / 1 x analog
Note
If the analog signal current (I) is selected in the menu under OU2 and the
output is not connected (resistor = infinite), the pressure transmitter
displays the error message W532 in intervals. This does not affect the
measuring result. As an alternative, configure OU2 to a switching output.
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3 Operation
This section provides instructions for configuring parameter settings.
3.1 Display and function buttons
The pressure transmitter displays information using the display and can be
controlled using the function buttons.
1 to 8: Indicator LEDs
LED 1 to LED 5 System pressure in the set unit of measurement.
LED 6 If OU2 is configured as an analog output, it indicates the
LED 7 Switching status of OUT2 (illuminates when output 2 is
LED 8 Switching status of OUT1 (illuminates if output 1 is switched).
9: Alphanumeric display, 4 digits
• Current system pressure
• Parameters and parameter values
system pressure in percent of the scaling of the analog output
(range ASP to AEP).
If OU2 is configured as a switching output, it indicates the
system pressure in percent of the upper range limit (URL).
switched).
10: Set button
Selects a parameter from the menu and modifies the value by holding pressed for
five seconds.
11: Mode/Enter button
Scrolls through the menu and acknowledges parameter values.
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3.1.1 Read the set parameters
Follow these steps to view the set parameter values.
Procedure
1. Press Mode/Enter until the pressure transmitter displays the desired
parameter.
2. Press Set.
The pressure transmitter displays the value currently set for the
selected parameter for 15 seconds then returns to run mode.
3.1.2 Change the display in run mode
Follow these steps to view the pressure measurement in different indicator
types. During normal operation, the pressure transmitter displays the
pressure measurement in the selected unit of measurement.
Procedure
• Press Set.
The pressure transmitter displays the following information for 15
seconds:
— System pressure in percent of the set scaling of the analog output if
OU2 is configured as analog output.
— System pressure in percent of the upper range limit if OU2 is
configured as switching output.
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