Rosemount 326P Operating Manual

Quick Start Guide

00825-0100-4327, Rev 01

January 2019

Rosemount™ 326P Pressure Transmitter

Quick Start Guide	Contents
00825-0100-4327	January 2019

Contents

Chapter 1	Introduction..................................................................................................................		5
	1.1	Pressure specifications.....................................................................................................................	5
	1.2	Operating modes.............................................................................................................................	7
	1.3	Functions..........................................................................................................................................	7

Chapter 2	Installation...................................................................................................................		11
	2.1	Installation orientation (3-A® standards).........................................................................................	11
	2.2	Hygienic process connection adapter installation...........................................................................	11
	2.3	Electrical connection......................................................................................................................	11

Chapter 3	Operation....................................................................................................................		15
	3.1	Display and function buttons..........................................................................................................	15
	3.2	Menu..............................................................................................................................................	17
	3.3	Parameter settings.........................................................................................................................	21

Chapter 4	Setting ranges..............................................................................................................		33
Chapter 5	Troubleshooting..........................................................................................................		41
	5.1	Error messages...............................................................................................................................	41
	5.2	Warning messages.........................................................................................................................	41
Chapter 6	Product certifications...................................................................................................		43
	6.1	European directive information......................................................................................................	43
	6.2	Ordinary location information........................................................................................................	43
	6.3	3-A® certification............................................................................................................................	43
	6.4	Other industry certifications...........................................................................................................	43
Chapter 7	Factory settings...........................................................................................................		45

Quick Start Guide

Contents	Quick Start Guide
January 2019	00825-0100-4327

4	Quick Start Guide

Quick Start Guide	Introduction
00825-0100-4327	January 2019

1 Introduction

The pressure transmitter measures and monitors pressure in a facility.

1.1Pressure specifications

To ensure product performance and safety, adhere to the following specifications.

1.1.1Measuring 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.

1.1.2Overpressure 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

1.1.3Burst 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	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

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Pressure range	Burst pressure limits

1B	5075	350

1.2Operating 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.

1.2.1Two-wire operation

OUT2 (pin 2) The analog signal proportional to pressure (4-20 mA or 20-4 mA).

1.2.2Three-wire operation

OUT1 (pin 4) Switching signal for system pressure limit value

OUT2 (pin 2) • Switching signal used for system pressure limit value

•Analog signal proportional to pressure (4-20 mA or 20-4 mA)

1.3Functions

The Rosemount 326P Pressure transmitter performs the functions described in this section.

1.3.1Switching 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	•	FE: Window
•	rP: Reset point	• Fno: Window function/normally open
•	P: Pressure	•	Fnc: Window function/normally closed

•Hy: Hysteresis

•Hno: Hysteresis function/normally open

•Hnc: Hysteresis function/normally closed

1.3.2Analog 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.

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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:

•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.

1.3.3Customer-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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Introduction	Quick Start Guide
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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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Quick Start Guide	Installation
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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.

2.1Installation 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.

2.2Hygienic 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.

2.3Electrical 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.

2.3.1Wiring 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

2.3.2Wiring 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	Black

BN	Brown

BU	Blue

WH	White

OUT1	Switching output

OUT2	Switching output or analog output (4-20
	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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14	Quick Start Guide

Quick Start Guide	Operation
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3 Operation

This section provides instructions for configuring parameter settings.

3.1Display 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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