Emerson Rosemount 327T Manuale utente

Quick Start Guide

00825-0100-4329, Rev 01

January 2019

Rosemount™ 327T Temperature Transmitter

Contents

Chapter 1 Introduction.................................................................................................................. 5

1.1 Getting started.................................................................................................................................5

1.2 Functions and features..................................................................................................................... 6

Chapter 2 Installation...................................................................................................................13

2.1 Mounting the transmitter...............................................................................................................13

2.2 Wire the Transmitter...................................................................................................................... 14

Chapter 3 Operation.................................................................................................................... 17

3.1 Setting Parameters.........................................................................................................................17

3.2 Operating mode............................................................................................................................. 18

Chapter 4 Setting range for drW and drA..................................................................................... 19

Chapter 5 Troubleshooting.......................................................................................................... 21

Chapter 6 Product certifications...................................................................................................23

6.1 European directive information...................................................................................................... 23

6.2 Ordinary location information........................................................................................................ 23

6.3 3-A® certification............................................................................................................................ 23

6.4 Other industry certifications........................................................................................................... 23

Chapter 7 Factory settings........................................................................................................... 25

Quick Start Guide Contents

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Contents Quick Start Guide

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4 Quick Start Guide

1 Introduction

The Rosemount 327T Temperature Transmitter detects media temperature and converts

it into an analog output signal (4 - 20 mA). The temperature transmitter includes an IO-

Link interface for configuring parameter settings or viewing process and diagnostic data.

1.1 Getting started

Follow these steps to configure the temperature transmitter for normal operation.

Procedure

1. Connect the temperature transmitter to a PC to set parameters using IO-Link.

2. Set the standard unit of measurement in °F or °C (Uni). (See Adjustable parameters)

3. Set the analog signal. (See Analog function)

•OU2: I = 4-20 mA or Ineg = 20-4 mA

•ASP and AEP: scaling of the measuring range.

4. Configure Drift Monitoring. (See Setting range for drW and drA)

•drW: drift threshold at which the temperature transmitter signals "warning".

•drA: drift threshold at which the temperature transmitter signals "alarm".

•ddr: Drift Monitoring Diagnostic delay.

5. Set which diagnostic cases the temperature transmitter signals using drEd. (See

Diagnostic cases)

•ON: only failure diagnostic cases

•ONdr: alarm and failure diagnostic cases

•OFF: warning, alarm, and failure diagnostic cases

6. Configure analog signal for diagnostic cases (FOU2). (See Adjustable parameters)

•ON: 21.5 mA

•OFF: 3.5 mA

7. Configure switching signal for diagnostic cases in three-wire operation (dOU1). (See

Diagnostic function (three-wire))

•dOU1: Output opens, closes, or pulsates; according to configuration.

8. Configure output logic for diagnostic output in three-wire operation (P-n). (See

Adjustable parameters)

•pnp

•npn

9. Complete all other necessary parameter settings.

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Postrequisites

Perform these tasks to complete setting up the transmitter:

•Mounting the transmitter

•Wire the Transmitter

•Operation

1.2 Functions and features

The temperature transmitter detects process temperature and converts it into an analog

output signal.

The temperature transmitter includes an IO-Link interface for configuring parameter

settings or viewing process and diagnostic data.

The transmitter operates in two-wire or three-wire operation modes. The modes produce

these output signals:

Operating mode Output signals

Two-wire Analog signal for temperature measurement and diagnostics

Three-wire •OUT1: switching signal for diagnostics and IO-Link communication

•OUT2: analog signal for temperature measurement and diagnostics

1.2.1 Analog function

The temperature transmitter converts the measured temperature value into an analog

signal proportional to the temperature.

The temperature transmitter also uses the analog output to send diagnostic messages

(see Diagnostic function). Diagnostic messages interrupt the transfer of the measured

temperature value depending on the operating mode and drEd. The transmitter modifies

the analog output to the following values according to NE43: 3.5 mA (FOU2 = On) or 21.5

mA (FOU2 = OFF).

Depending on the OU2 setting, the analog signal is between these measuring ranges in

normal operation:

•I: 4-20 mA

•Ineg: 20-4 mA

The measuring range is scalable using these parameters:

•ASP: the analog start point and the measured temperature when the analog signal is 4

mA (OU2 = I) or 20 mA (OU2 = Ineg)

•AEP: the analog end point and the measured temperature when the analog signal is 20

mA (OU2 = I) or 4 mA (OU2 = Ineg).

Note

The minimum difference between ASP and AEP is 9°F (5°C).

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6 Quick Start Guide

If the measured temperature value is outside the scaled measuring range, the analog

signal is 20-20.5 mA or 3.8-4 mA (see Figure 1-1). When the measured temperature value

continues to increase or decrease, diagnostic case 5 occurs. For more information, see

Diagnostic cases.

Figure 1-1: Analog output with factory settings

•1: Setting OU2 = I

•2: Setting OU2 = Ineg

•MAW: initial value of the measuring range

•MEW: final value of the measuring range

•ASP: analog start point

•AEP: analog end point

1.2.2 Diagnostic function

The temperature transmitter uses two different, thermally coupled sensor elements (NTC,

PT 1000) to automatically detect drifts and errors during temperature measurement.

The temperature transmitter forms an average value using the individual NTC and Pt 1000

measured values. That value determines the measured temperature value and is the basis

for Drift Monitoring Diagnostic (see Drift Monitoring).

The temperature transmitter can detect other errors. Use the parameter drEd to set which

diagnostic cases the temperature transmitter signals. For more information, see

Diagnostic cases.

The analog signal provides diagnostic case messages in two-wire operations. In three-wire

operations, the switching signal provides diagnostic case messages in addition to the

analog signal.

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Drift Monitoring

For Drift Monitoring Diagnostic, the temperature transmitter compares the temperature

deviation of sensor element 1 (NTC) and sensor element 2 (Pt 1000) to the average

temperature value. The parameters drW (warning threshold) and drA (alarm threshold)

define the permissible temperature deviation.

When values exceed these thresholds, the temperature transmitter triggers drift

monitoring and identifies a fault (see Diagnostic cases).

Figure 1-2: Drift monitoring example

Example: NTC sensor element (1) measures 149 °F and Pt 1000 sensor element (2)

measures 140 °F. The average value (3) is 144.5 °F, i.e. both elements deviate by 4.5 °F.

With setting drW = 4 °F and drA = 9 °F, the temperature transmitter provides a warning

message if drEd = OFF. In this case, the temperature transmitter would not send an alarm

message.

For more information about configuring drW and drA, see Setting range for drW and drA.

Note

Temperature difference of at most 0.18 °F (0.1 °C) can occur with sensor elements

because of standard manufacturing tolerances. This does not affect the drift monitoring

diagnostic.

Note

Large temperature changes in the medium might cause short-term differences between

the measured temperature values of both sensor elements. To avoid short-term drift

warnings, increase the drift warning delay time (ddr).

Sensor backup

If one of the two sensors in the transmitter fails, the temperature transmitter can use the

remaining sensor for temperature measurement.

For more information on operating the temperature transmitter in backup mode, see

Troubleshooting.

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8 Quick Start Guide

Note

Drift monitoring is not possible if a sensor fails and sensor backup is active.

Diagnostic cases

The temperature transmitter identifies error scenarios with these diagnostic cases.

For more information on parameters relating to diagnostic cases, see Adjustable

parameters or Drift Monitoring.

Table 1-1: Warnings

Diagnostic number Description

1 The temperature deviation exceeded the drift warning threshold (drW).

2 The temperature of the internal electronics exceeded the limit of 257 °F

(125 °C).

Table 1-2: Alarms

Case number Description

3 The temperature deviation exceeded the drift alarm threshold (drA).

4 One of the two sensor elements failed.

5 The measured temperature value is outside the allowable measuring

range.

6 The supply voltage is outside the operating range.(1)

(1) For 2-wire operation, no diagnostic message is provided in case of low voltage (see Diagnostic

function (two-wire)).

Table 1-3: Failures

Case number Description

7 The temperature deviation exceeded the drift failure threshold (drF).

8 An error occurred while setting parameters using IO-Link.

9 Both sensor elements failed or general electronics problems.

Diagnostic function (two-wire)

In two-wire operation, the temperature transmitter uses the analog output for

temperature measurement and diagnostics.

drEd configures the diagnostic cases that the temperature transmitter signals using the

analog output:

•ON: Limits the diagnostic messages to only failure messages. The temperature

transmitter will signal only diagnostic cases 7-9.

•ONdr: Limits the diagnostic messages to alarm and failure messages. The temperature

transmitter will signal only diagnostic cases 3-9.

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Quick Start Guide 9

•OFF: Allows all diagnostic messages. The temperature transmitter will signal all

diagnostic cases.

For more information, see Diagnostic cases.

To signal a diagnostic case, the temperature transmitter interrupts the transfer of

temperature measurements and provides these analog outputs using FOU2:

•ON: 21.5 mA

•OFF: 3.5 mA

Note

In a two-wire operation, the temperature transmitter does not provide diagnostic

messages in the event of low voltage.

Diagnostic function (three-wire)

In three-wire operation, the temperature transmitter uses an analog output for

temperature measurement and a switching output for diagnostics and IO-Link

communication.

drEd configures which diagnostic messages the temperature transmitter uses to indicate

failures.

•ON: Signals only failure diagnostic messages for the analog and switching outputs

(cases 7-9).

•ONdr: Signals only failure diagnostic messages (cases 7-9) for the analog output and

alarm and failure diagnostic messages (cases 3-9) for the switching output.

•OFF: Signals only failure diagnostic messages (cases 7-9) for the analog output and all

diagnostic messages (cases 1-9) for the switching output.

Note

Using the switching output in three-wire operation for diagnostics results in the analog

output being disrupted only if a failure is seen. This ensures maximum use of the analog

output.

dOU1 is used to define how the diagnostic output reacts to diagnostic messages:

dOU1 Normal Warning Alarm and failure

Normally closed (nc) Closed Closed Open

Normally closed,

extended (nc+)

Closed Switching open/closed

at 2 Hz

2 Hz

Open

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10 Quick Start Guide

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