Fisher 444 Alphaline Disassembly Procedure

Rosemount Model 444 Alphaline Temperature Transmitters

4-4

DisassemblyProcedure

NOTE

The numbers in parentheses refer to parts shown in the Illustrated Parts List,

Table 5-7, in Section 5 Specifications and Reference Data.

1. Terminal blocks for making all field wiring ele ctrical connections are

located in a compartment identified as “Terminal Side” on the nameplate.

The sensor terminals, power supply and signal-test terminals, as well as

the zero and span adjustments are accessible by removing the Electronics

Housing Cover (2) from the terminal side. The terminals are permanently

attached to the housing and must not be removed.

2. The trans mitter electronics Circuit Board Assembly (5, 6, 7) is located in a

separate compartment, identified as “Circuit Side” on the nameplate.

Make sure power is off. Then remove Circuit Side Cover (2).

NOTE

On the standard RTD input (Model 444RL), fast turn-on (Model 444RL

___B0912), and low-power (Models 444LL and LM) units, boards 5 and 6 are

integrated into one board.

3. Remove the three Circuit Board Assembly Screws (4).

4. Push equall y on the zero and span adjustment pot shafts from the

terminal side. This will allow you to grasp and remove the Circuit Board

Assembly.

5. If trouble shooting is required, it is best to keep the Circuit Board

Assembly together for initial evaluation. Otherwise, the board assembly

may be disassembled by grasping the Output Board (5) around its

circumference and pulling it gently and evenly away from the other two

boards. Remove the Amplifier Board (6) in the same manner. Take care not

to bend the interconnection pins.

6. The adjustment pot shafts are sealed by two small O-rings (1D). Remove, if

necessary, by taking off the O-ring Retainer Plate (1B), which is held in

place by two small screws (1C).

7. The Namep late (1E), Hazardous Service Certification Label (9), and

Instrument Tag (8) are held in place with Drive Screws (1F). Remove any

of these by gripping the head of the Drive Screw with plie rs and carefully

turning counter-clockwise.

Explosion can cause death or serious injury. Do not remove

the instrument coverin explosive atmospheres when the

circuit is alive.

High voltagetha tmay be present on leads can cause

electrical shock.M akesure all power to the transmitter is off

beforewir ing.

Contents

Main Page Product Manual 7:00 a.m. to 7:00 p.m. CST) 24 hours a day IncludesCanada) NOTICE 1 Model 444 Alphaline Temperature Transmitters Page Table of Contents SECTION 1 Introduction SECTION 2 SECTION 3 Calibration Page 1Introduction OVERVIEW Page 2Installation OVERVIEW GENERAL MECHANICAL Mounting Stability Access Requirements 2-3 FIGURE2-1. Recommended Process Mounting. FIGURE2-2. Recommended Process Mountingwith Drain Seal. ELECTRICAL Power Supply Field Wiring 2-5 FIGURE 2-4. Field Wiring for the Standard Model 444 Transmitters. { FIGURE 2-5. Field Wiring for Low-Power Model 444 Transmitters (444LL and LM). Sensor Connections 2-6 FIGURE 2-7. Characteristicsof Thermocouple and RTD Input Wires. FIGURE 2-6.Sensor Wiring Diagrams. Grounding Multi-Channel Installations Surges/Transients ENVIRONMENTAL Temp era tur e Environment 2-9 FIGURE 2-9. Model444 Transmitter Housing TemperatureRise. FIGURE 2-10.Sensor AssemblyDimensional Drawings. Moist or Corrosive Environments HazardousLocation Intrinsically Safe PROCEDURE Mechanical Electrical Page 2-13 FIGURE 2-11.Model 444 with Optional Mounting Bracket. FIGURE 2-12.Model 444 Dimensional Drawings PIPESTAND MOUNTING PANEL OR SURFACE MOUNTING Page 3Calibration OVERVIEW SAFETY MESSAGES RTD TRANSMITTER Page 3-4 THERMOCOUPLE TRANSMITTER Using a Compensated Thermocouple Simulator + 3-6 U s i n ga nI c e B a t h LOW-POWER TRANSMITTER Page Page 4Maintenance and Troubleshooting OVERVIEW HARDWARE DIAGNOSTICS TROUBLESHOOTING 4-2 TABLE4-1. Transmitter TroubleshootingSymptoms andCorrectiveActions. Symptom PotentialSource CorrectiveAction REPAIR Disassembly Procedure Reassembly Procedure Interchangeability of Parts Burnout Protection Adjustments REPAIR AND WARRANTY SERVICE RETURN OF MATERIALS 5Specifications and Reference Data FUNCTIONAL Page PERFORMANCE PHYSICAL Page Page LCD METER (OPTIONS D AND E) Functional Specifications Performance Specifications Physical Specification Page 5-9 TABLE5-3. 444 Model Structure. TypicalModel Number: 0444 RL3 U 1 A 2 E5 Q4 Model Product Description Code Input Type(1) 5-10 TABLE5-4. 444RL Fast Turn-on Model Structure. 5-11 TABLE5-5. 444LL, LM Model Structure. TABLE5-6. Meter Kits. Model ProductDescription Code Input Type j 5-13 TABLE5-8. Parts List forModel W444 Transmitter (CESI/CENELEC Approval). j 5-14 TABLE5-9. Parts List forModel T444 Transmitter (BASEEFAApproval). 5-15 TABLE5-10. Parts List for Model 444 RL Fast Turn On Transmitter(RTD Input). TABLE5-11. Parts List for Model 444 LL, 444 LM Low PowerTransmitter (RTD Input). j 5-16 TABLE5-12. Parts List for Model 444 Increased Accuracy or Special Range Transmitters. Code D Not used on transmitters,but recommended for repair activities. Page Page 6Options MOUNTING BRACKET LCD / ANALOG METER LCD METER Configuration Page LCD Meter Assembly LCD Meter Page ANALOG METER } Analog Meter Page Page Page Page Page Page Appendix B-1 BTemperature Sensor Reference Information TABLEB-1. Resistance VersusTemperature Curve Ro=100.00,a=0.00385 Reference Standard IEC 751. Page I-1 Index A B C D S T U V W Page Page Rosemount Inc. http://www.rosemount.com Fisher-Rosemount Limited Fisher-Rosemount 00809-0100-4263z 00809-0100-4263, Rev. AA