Emerson Rosemount 327T User manual
Quick Start Guide
00825-0100-4329, Rev 01
January 2019
Rosemount™ 327T Temperature Transmitter
2
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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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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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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•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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Table of contents
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