How it Works
Rosemount
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326P
Operating Manual
48 pgs899.36 Kb0
Specifications
16 pgs803.16 Kb0
Table of contents
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Rosemount 326P Operating Manual

Quick Start Guide
00825-0100-4327, Rev 01
Rosemount™ 326P Pressure Transmitter
January 2019
2
Quick Start Guide Contents
00825-0100-4327 January 2019

Contents

1.1 Pressure specifications..................................................................................................................... 5
1.2 Operating modes............................................................................................................................. 7
1.3 Functions..........................................................................................................................................7
2.1 Installation orientation (3-A® standards).........................................................................................11
2.2 Hygienic process connection adapter installation...........................................................................11
2.3 Electrical connection...................................................................................................................... 11
3.1 Display and function buttons..........................................................................................................15
3.2 Menu..............................................................................................................................................17
3.3 Parameter settings......................................................................................................................... 21
5.1 Error messages............................................................................................................................... 41
5.2 Warning messages......................................................................................................................... 41
6.1 European directive information...................................................................................................... 43
6.2 Ordinary location information........................................................................................................ 43
6.3 3-A® certification............................................................................................................................43
6.4 Other industry certifications...........................................................................................................43
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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
1.1.2
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.

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.
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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.
Pressure range
1A 12044 30
2A 12044 30
3A 435 30
2B 435 30
4A 580 40
5A 725 50
6A 1450 100
Burst pressure limits
inH2O bar
psi bar
7A 1450 100
8A 2175 150
9A 3625 250
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Pressure range Burst pressure limits
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)
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)

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.
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Figure 1-1: Hysteresis function Figure 1-2: Window function
• SP: Set point
• rP: Reset point
• P: Pressure
• Hy: Hysteresis
• Hno: Hysteresis function/normally open
• Hnc: Hysteresis function/normally closed

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).
• FE: Window
• Fno: Window function/normally open
• Fnc: Window function/normally closed
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.
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Figure 1-3: Factory setting Figure 1-4: Transmitter reranged
P: system pressure
Introduction
1.3.3
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:
• 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.

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
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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
• 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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Installation

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 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.

2.3 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.
2.3.1

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.
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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
2.3.2

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
OUT1 Switching output
OUT2 Switching output or analog output (4-20
Black
mA)
Colors to DIN EN 60947-5-2
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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 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).
LED 7 Switching status of OUT2 (illuminates when output 2 is switched).
LED 8 Switching status of OUT1 (illuminates if output 1 is switched).
9: Alphanumeric display, 4 digits
• Current system pressure
• Parameters and parameter values
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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