Fisher 444 Alphaline User Manual

00809-0100-4263

Product Discontinued

English

Rev. AA

Model 444 Alphaline® Temperature Transmitters

Product Manual

Model 444 Alphaline

Temperature Transmitters

NOTICE

Read this manual before working with the product. For personal and system safety, and for optimum product performance, make sure you thoroughly understand the contents before installing, using, or maintaining this product.

Within the United States, Rosemount Inc. has two toll-free assistance numbers. Customer Central: 1-800-999-9307 (

Technical support, quoting, and order-related questions.

North American 1-800-654-7768 ( Response Center: Equipment service needs.

For equipment service or support needs outside the United States, contact your local Rosemount representative.

7:00 a.m. to 7:00 p.m. CST)

24 hours a day – Includes Canada)

Rosemount Inc.

8200 Market Boulevard Chanhassen, MN 55317 USA Tel 1-800-999-9307 Telex 4310012 Fax (612) 949-7001

00809-0100-4263 © Rosemount Inc. 1998.

http://www.rosemount.com

The products described in this document are NOT designed for nuclearqualified applications.

Using non-nuclear qualified products in applications that require nuclearqualified hardware or products may cause inaccurate readings.

For information on Rosemount nuclear-qualified products, contact your local Rosemount Sales Representative.

SNF-0004

Ros

emount, the Rosemount logotype, and Alphaline are registered trademarks of Rosemount Inc.

Chromel and Alumel are trademarks of Hoskins Mfg. Co.

Cover Photo: 444-005AC

Fisher-Rosemount satisfies all obligations coming from legislation to harmonize product requirements in the European Union.

Table of Contents

SECTION 1 Introduction

SECTION 2 Installation

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

General Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

Mechanical Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Mounting Stability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Access Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Housing Rotation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Terminal Side of Electronics Housing . . . . . . . . . . . . . . . . . 2-2

Circuit Side of Electronics Housing . . . . . . . . . . . . . . . . . . 2-2

Electrical Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Field Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3

Sensor Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4

RTD Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4

Thermocouple or Millivolt Inputs . . . . . . . . . . . . . . . . . . . . 2-6

Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6

Multi-Channel Installations . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6

Surges/Transients . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6

Environmental Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7

Temperature Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7

Moist or Corrosive Environments . . . . . . . . . . . . . . . . . . . . . . . 2-9

Hazardous Location Installation . . . . . . . . . . . . . . . . . . . . . . . . 2-9

Intrinsically Safe Installation . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9

Installation Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10

Mechanical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10

Electrical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11

SECTION 3 Calibration

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

Safety Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

Calibrating a RTD Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

Calibrating a Thermocouple Transmitter

Using a Compensated Thermocouple Simulator . . . . . . . . . . . 3-5

Using an Ice Bath . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7

Calibrating a Low-Power Transmitter . . . . . . . . . . . . . . . . . . . . . . 3-8

Calibrating a Millivolt Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . 3-10

SECTION 4

Maintenance and

Troubleshooting

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

Hardware Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2

Disassembly Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3

Reassembly Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5

Interchangeability of Parts

Mechanical Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6

Electrical Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6

Burnout Protection Adjustments . . . . . . . . . . . . . . . . . . . . . . . . 4-6

Repair and Warranty Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7

Return of Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7

SECTION 5 Specifications and Reference Data

SECTION 6 Options

APPENDIX A Approval Drawings

APPENDIX B T emperature Sensor Reference Information

Functional Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1

Performance Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3

Physical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3

LCD Meter Specifications

Functional Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-7

Performance Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-7

Physical Specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-7

Analog Meter Specifications

Functional Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-8

Performance Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-8

Physical Specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-8

Mounting Bracket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1

LCD / Analog Meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1

Section

1 Introduction

OVERVIEW

This manual is designed to assist in installing, operating, and maintaining Rosemount Transmitters.

Section 2 Installation

provides mechanical, electrical, and environmental considerations to guide you through a safe and effective transmitter installation.

Section 3 Calibration

provides different Model 444 calibration procedures.

Section 4 Maintenance and Troubleshooting

provides hardware diagnostics, maintenance tasks, basic hardware troubleshooting techniques, and considerations for returning materials.

Section 5 Specifications and Reference Data

provides functional, performance, and physical transmitter specifications; also includes transmitter dimensional drawings, ordering information, and spare parts.

Section 6 Options

provides a listing of transmitter options and a description of each.

Appendix A Approval Drawings

contains approval drawings for Canadian Standards Association (CSA) and Factory Mutual (FM) instrinsic safety installation.

Appendix B Temperature Sensor Reference Information

provides reference information regarding the application of various Rosemount temperature sensors.

Model 444 Alphaline® Temperature

1-1

Rosemount Model 444 Alphaline Temperature Transmitters

1-2

Section

2 Installation

OVERVIEW

This section includes the following transmitter installation information:

• General Considerations

• Mechanical Considerations Mounting Stability

Access Requirements

• Electrical Considerations Power Supply

Field Wiring Sensor Connections Grounding Multi-Channel Installations Surges/Transients

• Environmental Considerations Temperature Environment

Moist or Corrosive Environments Hazardous Location Installation Intrinsically Safe Installation

• Installation Procedure Mechanical

Electrical

GENERAL CONSIDERATIONS

Failure to follow these installation guidelines may result in death or serious injury. Make sure only qualifiedpersonnel perform the installation.

Explosions can cause death or serious injury. Verify that the operating atmosphere of the transmitter is consistent with the appropriate hazardous locationscertifications.

Use the Rosemount Model 444 Alphaline Temperature Transmitter when the temperature measurement point is remote from the control, readout, or recording point, or where the measurement point is exposed to environmental conditions that would be harmful to unprotected signal conditioning equipment.

Electrical temperature sensors such as RTDs and thermocouples

2-1

Rosemount Model 444 Alphaline Temperature Transmitters

produce low-level signals proportional to their sensed temperature. Model 444 temperature transmitters convert the low-level sensor signal to a standard 4–20 mA dc signal that is relatively insensitive to lead length and electrical noise. This current signal is then transmitted to the control room via two wires.

Figures 2-1, and 2-2 show recommended mounting configurations for transmitter and sensor assemblies. See Section 6 Options for information regarding Model 444 transmitter accessories.

MECHANICAL CONSIDERATIONS

Mounting Stability

Access Requirements

Housing Rotation You may rotate the transmitter in 90-degree increments to improve field access

Terminal Side of Electronics Housing

Circuit Side of Electronics Housing

You can attach the transmitter directly to the sensor assembly as shown in Figures 2-1 and 2-2. An optional mounting bracket permits the transmitter to be mounted remotely from the sensor(s), either on a flat surface or attached to a two-inch pipe (See Figure 2-11 on page 2-13). The choice of mounting method must take into account a number of factors:

Mounting stability is an important consideration. The transmitter, though rugged, may require supplementary support under high-vibration conditions, particularly if extensive thermowell lagging or long extension fittings are used. In such instances, the pipestand mounting technique shown in Figure 2-11 on page 2-13 is preferable.

When choosing an installation location and position, take into account the need for access to the transmitter.

to both compartments. Make wiring connections through the conduit openings on the terminal side of

the electronics housing. Mount the transmitter so the terminal side is accessible, and be sure to provide adequate clearance for cover removal.

The transmitter electronics are installed in the circuit side of the transmitter housing. In case of electronic malfunction, provide adequate clearance for circuit-side cover removal. Also, be sure to account for additional clearance if a meter is to be installed. For more information regarding the meter option, refer to Section 6 Options.

2-2

FIGURE2-1. Recommended Process Mounting.

Installation

Thermowell

NOTE Dimensionsare in inches (millimeters).

FIGURE2-2. Recommended Process Mounting with Drain Seal.

Thermowell Hex

Extension Nipple

Extension

Length

Union or Coupling

Sensor Hex

Transmitter

Conduit for

Field Wiring

(dc Power)

3.2

(81.3)

444-0200C

Extension Nipple

Union or Coupling

Sensor Hex

Drain Seal

Conduit for

Field Wiring

(dc Power)

Coupling

Close Nipple

Street Ell

Transmitter Terminal Side

444-0200F

2-3

Rosemount Model 444 Alphaline Temperature Transmitters

ELECTRICAL CONSIDERATIONS

Po wer Supply

FIGURE 2-3. Model 444 Load Limits.

This section contains information that you should consider when preparing to install Model 444 transmitters. Read this section carefully before going on to the installation procedures. Metal conduit should be used to enclose cabling for best results in electrically noisy environments.

The dc power supply should provide power with less than 2% ripple. The input voltage versus load limitation relationship for 4–20 mA transmitters is shown in Figure 2-3. Figure 2-4 shows field wiring for a standard Model 444 transmitter. Figure 2-5 shows field wiring for Models 444LL and 444LM low-power voltage output units, which require 100K ohms minimum load. The total R-load is the sum of the resistance of the signal leads and the load resistance of the controller, indicators, and related devices. Note that the resistance of intrinsic safety barriers, if used, must be included in the total load.

Power Supply Load Limitations

LOAD(MAX.)

1650 1500

1000

500

Load (Ohms)

Voltage

Too Low

12 20 30 40

=503 (V

Power Supply (V dc)

(MIN.)

Operating

Region

– 12)

Field Wiring

Explosions mayresult in death or serious injury. Do not remove the instrument cover in explosive atmospheres when the circuit is alive.

High voltage that may be present on leads can cause electrical shock.Avoid contact with leads and terminals.

Do not apply high voltage (e.g. ac line voltage) to the transmitter terminals. Abnormally high voltage can damage the unit.

All power to the transmitter is supplied over the signal wiring. Signal wiring need not be shielded, but use twisted pairs for best results. Do not run unshielded signal wiring in conduit or open trays with power wiring, or near heavy electrical equipment. To power the transmitter, connect the positive power lead to the terminal marked “+” and the negative power lead to the terminal marked “–” (see Figures 2-4 and 2-5). Tighten the terminal screws to ensure adequate contact. No additional power wiring is required.

2-4

FIGURE 2-4. Field Wiring for the StandardModel 444 Transmitters.

Meter Connections

and S ignal

Test Points

(+)

{

(–) (–)

(+)

{

dc Power

Installation

FIGURE 2-5. Field Wiring for Low-Power Model 444 Transmitters (444LL and LM).

RTD Input

(typical)

Zero Adjust

RTD Input

Zero Adjust

Output Voltage (+)

Optional

Ground

Span Adjust

(+) dc Power

(–) Common

Shield

Span Adjust

–+–+

Power

Supply

++––

444-0000C02A

Output Load Limitation

Minimum Load = 100K

AtoD

Converter

Optional

Ground

444-0000A02A

Sensor Connections

RTD Inputs

Explosion mayresult in death or serious injury. Do not remove the instrument cover in explosive atmos pheres when the circuit is alive.

Highvoltagethatmaybe present on leads can causeelectrical shock. Avoid contact with the leads and the terminals.

Various RTD configurations are used in industry; each configuration offers a specific solution for compensating the effects of lead wire resistance. They include 3- and 4-wire designs. The correct installation for each of these RTDs is shown in Figures 2-6a and b on page 2-6.

If the transmitter is mounted remotely from the RTD, operation will be satisfactory, without recalibration, for lead wire resistances of up to 2 ohms per lead (equivalent to 200 feet of 20 AWG wire). In this case, the leads between the RTD and transmitter should be shielded.

2-5

Rosemount Model 444 Alphaline Temperature Transmitters

The correct connections for a compensation loop RTD and a 2-wire RTD are shown in Figure 2-6c and Figure 2-6d, respectively. In a 2-wire RTD, however, both leads are in series with the sensor element, so significant errors (0.1 °C) could occur if the lead lengths are greater than one foot. For longer runs when using a 2-wire RTD, attach a third lead and connect as shown in Figure 2-6a.

FIGURE 2-6.Sensor Wiring Diagrams.

Signal

–+

Red

White

Model 444 with 3-Wire RTD

Figure 2-6a

Signal

+ Output Common –

Red

Model 444LL or 444LM

with 3-Wire RTD

Figure 2-6e

Signal

–+

Red

White

Model 444 with 4-Wire RTD

Figure 2-6b

Red

White

Model 444MV with Millivolt

Input or Model444T Series

with Grounded or

Ungrounded Thermocouple

White

Signal

–+

Figure 2-6f

Model 444 with

Comp. Loop RTD

Figure 2-6c

–+

High T/C

–+

Signal

–+

Red

Jumper

White

Model 444 with 2-Wire RTD

Black

Signal

++ ––

Model 444MV used as

DifferentialMillivolt

Transmitter (T/C Junctions

must be ungrounded)

Figure 2-6g

Figure 2-6d

–+

Low T/C

Signal

White

Red

–+

444-0203A;B;C;D

FIGURE 2-7.Characteristics of Thermocouple and RTD Input Wires.

Thermocouple Type Positive Lead Negative Lead

J Iron (Magnetic) Constantan (Non-magnetic)

K Chromel (Non-magnetic) Alumel (Magnetic)

T Copper (Yellow color) Constantan (Silver color) E Chromel (Shiny metal) Constantan (Dull metal) R Platinum 1 3% Rhodium Platinum S Platinum 10% Rhodium Platinum

Single Element RTD Compensation Loop RTD Dual E lement RTD

Red

White

2-6

Red

White

Black

Red

White White

Black

Green Green

444-0207A

Installation

Thermocouple or Millivolt Inputs

Grounding

In the case of thermocouples, make connections between the sensor and the transmitter with thermocouple wire. For process mounting applications, connect the thermocouple directly to the transmitter. For installations where the transmitter is mounted remotely from the sensor, use appropriate thermocouple extension wire. As with all low-level signal wiring, shielding is recommended for long runs. Make input connections for the Model 444MV Millivolt Transmitter using copper wires. The correct connections for thermocouple and millivolt inputs are shown in Figures 2-6f and g.

The transmitter will operate with the current signal loop either floating or grounded. However, many types of readout devices are affected by the extra noise in floating systems. If operation appears noisy or erratic, grounding the current signal loop at a single point may solve the problem. The negative terminal of the power supply is the best place to ground the loop. Alternately, either side of the readout device could be grounded. Do not ground the current signal loop at more than one point.

Thermocouple and millivolt transmitters are isolated, so the input circuit also may be grounded at any single point (when a grounded thermocouple is used, this point is the grounded junction), and the signal loop may be grounded at any point.

The 444RL transmitter is not isolated, so there can be no grounds in the RTD circuit. Since RTDs must be well-insulated from ground in order to give correct temperature readings, this is not normally an installation limitation. The positive side of the power supply should not be grounded for use with RTD input transmitters. The 444RI9 should be used with grounded RTDs.

Multi-Channel Installations

FIGURE 2-8. Multi-Channel Installation.

Transmitter

No. 1

Transmitter

No. 2

If using shielded wire, connect the shield of the sensor-to-transmitter cable to the shield of the transmitters-to-receiver cable. Ground the shielding only at the signal loop ground.

Figure 2-8 illustrates how several transmitters can be connected to a single master power supply. In this instance, the system can be grounded only at the negative power supply terminal. Since several channels are dependent on one supply, an uninterruptible power supply or backup battery should be considered if loss of all channels would pose operational problems. The diodes shown in Figure 2-8 prevent unwanted charging or discharging of the battery.

ToAdditional

Transmitters

Readout or

Controller No. 1

Readout or

Controller No. 2

Backup Battery

–

Power

Supply

–

444-0202A

2-7

Rosemount Model 444 Alphaline Temperature Transmitters

Surges/Transients

ENVIRONMENTAL CONSIDERATIONS

Temperature Environment

The transmitter will withstand electrical transients of the energy level usually encountered in static discharges or induced switching transients. However, highenergy transients, such as those induced in wiring from nearby lightning strikes, can damage both the transmitter and the sensor.

To protect against high-energy transients, install Model 444 transmitters in conjunction with the Rosemount Model 470 Transient Protector. The Model 470 prevents damage from transients induced by lightning, welding, heavy electrical equipment, or switch gears. Refer to the Model 470 Transient Protector product data sheet, pub. no. 00813-0100-4191 for more information.

The transmitter will operate within specifications for ambient temperatures between –25 and 85 °C. It will function, but not necessarily within specifications, in ambient temperatures between –40 and 100 °C.

Aside from ambient temperature variations, heat from the process is transferred from the thermowell to the transmitter housing. If the process temperature is near or beyond specification limits, use excess thermowell lagging or an extension nipple to protect the transmitter from the high temperature condition. See Figure 2-10.

EXAMPLE:

Suppose the maximum ambient temperature is 40 °C and the temperature to be measured is 540 °C. The maximum allowable housing temperature rise is the rated temperature specification limit minus the existing ambient temperature (85 – 40), or 45 °C. As shown in Figure 2-9, an “E” dimension of

3.6 inches will result in a housing temperature rise of 22 °C. An “E” dimension of 4 inches would therefore be the minimum recommended length, and would provide a safety factor of about about 25 °C. A longer “E” dimension, such as 6 inches, would be desirable in order to reduce errors caused by transmitter temperature effect, although in that case the transmitter would probably require extra support. If a thermowell with lagging is used, the “E” dimension may be reduced by the length of the lagging.

2-8

Installation

FIGURE 2-9. Model 444 Transmitter Housing Temperature Rise.

FIGURE 2-10. Sensor Assembly Dimensional Drawings.

HOUSING

RISE

ABOVE

AMBIENT

°C (°F)

(108)

(90)

(72)

(54)

(36)

(18)

Connection Head with Extended Cover

3 4 5 6 7 8 9

Bayonet Spring Loaded Sensor

Transmitter Housing Temperature Rise

vs. Length for a Test Installation

(

540

(

1000

3.6

(

2°

)

Length in Inches

½–14 NPT Thread

3044-0123A

NOTE Dimensions are in inches (millimeters).

5.5

(140)

3.5

(89)

Chain

Sensor Installed in

Connection Head (Extended Cover)

with Coupling and

Nipple Extension

1.0

(25)

2.2

(56)

Spring Loaded Sensor

Connection Head with

Flat Cover

¾–14 NPT

Nominal Fitting

Sensor Installed in ConnectionHead(Flat Cover)withUnionand

Nipple Extension and

Thermowell

Sensor Length (Ref.)

Length

(1)

+ 1.75 (44)

(1)

= 0.0 on Standard Assembly Thermowells

0.53 (13) Max. Thread

Engagement

¾–14 NPT

on Thermowell

0.25 (6)

Sensors-0000A06A

2-9

Rosemount Model 444 Alphaline Temperature Transmitters

Moist or Corrosive Environments

HazardousLocation Installation

The transmitter is designed to resist attack by moisture and other corrosives. The coated circuit boards are mounted in a compartment completely sealed from the conduit entrances. O-ring seals protect the interior when the covers are installed. In humid environments, however, it is still possible for moisture “breathing” to occur in conduit lines. If the transmitter is mounted at a low point in the conduit run, the terminal compartment could fill with water, causing electrical shorting. The transmitter should be mounted so moisture from the conduit will not drain into the housing. In some instances a drain seal, installed as shown in Figure 2-2 on page 2-3, is advisable.

Explosions mayresult in death or serious injury.Verify that the operating atmosphere of the transmitter is consistent with the appropriate hazardous locations certifications.

Explosions mayresult in death or serious injury.Both transmitter covers must be fully engaged to meet explosionproof requirements.

Intrinsically Safe Installation

The Model 444 is designed with an explosion-proof housing and circuitry suitable for intrinsically safe and non-incendive operation. Individual transmitters are clearly marked with a tag indicating the approvals they carry. The various approvals are available as options. Refer to Section 5 Specifications and Reference Data for a complete listing of available approvals.

To maintain certified ratings for installed transmitters, install in accordance with applicable installation codes and approval drawings. Refer to Appendix A Approval Drawings for Model 444 installation drawings. For future orders, refer to the current product price list for the most up-to-date information on these approvals.

For explosion-proof installations, installation location must be m ade in accordance with Rosemount drawing 004440261, Rev. E.

For intrinsically safe installations, installation location must be m ade in accordance with Rosemount drawing 004440034, Rev. C (CSA) or00444-0264, Rev. B (SAA).

You can use Intrinsically safe installations instead of explosion-proof installations in hazardous areas. In such configurations, the transmitter and sensor are located in a hazardous area, and the current signal leads are connected to equipment in a non-hazardous area through intrinsic safety barriers that limit the voltage and current fed into the hazardous area. Install in accordance with the barrier manufacturer’s instructions for the specific barrier used. For approval information, refer to Table 5-1 on page 5-4, and Table 5-2 on page 5-5. For installation information, refer to the intrinsically safe barrier systems reference drawings in Appendix A Approval Drawings.

2-10

Installation

INSTALLATION PROCEDURE

Installation consists of mounting the transmitter and sensor assembly and making electrical connections. If mounting the transmitter directly to the sensor assembly, use the process mounting technique shown in Figure 2-1 or Figure 2-2, on page 2-3. For transmitter locations remote from the sensor, use conduit between the sensor and transmitter. Transmitter hubs will accept male conduit fittings with ½–14 NPT; ½–14 NPSM; or ½–14 taper thread per ANSIC 80.4.

Explosion mayresult in death or serious injury. Do not remove the instrument cover in explosive atmos pheres when the circuit is alive.

High voltage that may be present on leads may cause electrical shock.Avoid contact with the leads and the terminals.

Process leaks may result in death or serious injury.Install and tighten thermowells or sensors before applying pressure, or process leakage may result. Removing the thermowell or sensor while in operation may cause process fluid leaks.

Mechanical

Electrical

1. Mount the thermowell to the pipe or process container wall.

2. Attach any necessary extension nipples and adapters. Seal the nipple and adapter threads with silicone or tape.

3. Screw the sensor into the thermowell.

4. Install drain seals if required for severe environments or to satisfy code requirements (See Figure 2-2 on page 2-3).

5. Attach the transmitter to the thermowell assembly. Seal the adapter threads with silicone or tape.

6. Install conduit for field wiring to the remaining conduit entry of the transmitter. Seal conduit threads with silicone or tape.

7. Pull field wiring leads through the conduit into the terminal side of the transmitter housing.

For explosion-proof installations, wiring connections must be m ade in accordance with Rosemount drawing 004440261, Rev. E.

For intrinsically safe installations, wiring connections must be m ade in accordance with ANSI/ISA-RP12.6, and Rosemount drawing 00444-0034, Rev.C (CSA) or 004440264, Rev. B (SAA).

For all installations, wiring connections must follow the National Electric Code.

2-11

Rosemount Model 444 Alphaline Temperature Transmitters

Preliminary Checkout

1. For any Model 444 unit, first verify that the transmitter is calibrated to the required range. Calibration is usually performed by substituting an input in place of the sensor, and this is most conveniently accomplished prior to sensor connection. Refer to the calibration procedures in Section 4 Maintenance and Troubleshooting.

Input Connections

2. Model 444RL: Connect the RTD leads as shown in Figure 2-6a, b, c, d, or e depending upon the lead compensation method used.

Model 444T series: Connect the thermocouple leads as shown in Figure 2-6f. Polarity is important; be sure to identify the leads accurately. The negative lead is usually red; if there is no color coding, the characteristics provided in Figure 2-7 may be helpful.

Model 444MV: If using the transmitter as a millivolt-to-milliampere converter, use ordinary copper leads for input connections as shown in Figure 2-6f. If using the transmitter with two thermocouples to measure differential millivolt, connect the thermocouples as shown in Figure 2-6g. The “high” thermocouple causes the transmitter output to increase when its temperature increases relative to the “low” thermocouple. Grounded thermocouples cannot be used for differential measurements.

Models 444LL and LM: In these low-power option packages, the RTD leads are connected the same as in the conventional RTD arrangements shown in Figure 2-6a, b, c, and d.

Output Connections

3. For all 4–20 mA models, use ordinary copper wire of sufficient size to assure that the voltage across the transmitter power terminals does not go below 12 V dc (See Figure 2-3). For multi-channel or intrinsically safe installations, see applicable paragraphs in this section.

Model 444RL: Connect current signal leads as shown in Figure 2-6a, b, c, or d.

Model 444T series: Connect current signal leads as shown in Figure 2-6f. Model 444MV: Connect current signal leads as shown in Figure 2-6f or g. Models 444LL and LM: Connect current signal leads as shown in Figure

2-6e.

Final Checkout

4. For all models, recheck the polarity and correctness of connections; then turn the power on.

2-12

FIGURE 2-11. Model 444 with Optional Mounting Bracket.

Installation

PIPESTAND MOUNTING

Clearance Hole

for ¼-inch Bolt

(eight places)

NOTE Dimensions are in inches (millimeters).

FIGURE 2-12. Model 444 Dimensional Drawings

4.5 Max. (114)

Transmitter can be Rotated 90°

Mounting Bracket

¼–20 3½-inch

/16 –18 U-bolt for

2-inch Pipe (2)

Permanent Tag

(Optional)

Bolt (4)

PANEL OR SURFACE MOUNTING

5.00 (127)

7.5 (191) Max. with Optional Meter

Meter Housing

/16 -inch Bolts

(four required,

not furnished)

2.81 (81)

4.5 Max. (114)

Hole for

/16 -inch

Bolts

(four

places)

0.75 (19)

Clearance for

Cover Removal

(Typical)

444-1151G, 1151F04A

4.5 Max.

Nameplate

Explosion Proof or

Intrinsic Safety L abel

(Optional)

0.375 (10) Min. Dp.

NOTE Dimensions are in inches (millimeters).

(114)

Mounting Holes

¼–20 UNC–2B

(four places)

½–14 NPT per

ANSI C80.4 for

Conduit or Sensor

Connection

(two places)

0.87 (22)

1.7

(44)

(117)

Terminal

Connections

this Side

0.36 (9)

0.72 (18)

4.2

Terminal Circuitry this Side

444-51LTE 05A, 51LTG05A, 51LTF 05A

2-13

Rosemount Model 444 Alphaline Temperature Transmitters

2-14

Section

3 Calibration

OVERVIEW

SAFETY MESSAGES

Each transmitter is factory calibrated to the temperature range shown on the nameplate. If calibration to a specific range is not specified on the purchase order, the transmitter is calibrated to maximum span with a base temperature of 0 °C, and the “Calibration” entry on the transmitter nameplate is left blank. For more specific calibration information and a complete breakdown of transmitter parts, refer to Section 5 Specifications and Reference Data.

Only a few calibration laboratories have the kind of precision temperature baths necessary for accurate direct calibration of a temperature sensor or sensor/transmitter system. As a result, the transmitter is normally calibrated by substituting a resistance decade box for an RTD or a compensated thermocouple simulator for a thermocouple.

This section contains the following transmitter calibration information:

• Calibrating a RTD Transmitter

• Calibrating a Thermocouple Transmitter

• Calibrating a Low-Power Transmitter

• Calibrating a Millivolt Transmitter

This section contains procedures that require removing the transmitter covers and making electrical connections. The following safety messages apply to all such procedures.

Explosion mayresult in death or serious injury. Do not remove the instrument cover in explosive atmos pheres when the circuit is alive.

High voltage that may be present on leads can cause electrical shock.Avoid contact with the leads and the terminals.

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