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Fisher 444 Alphaline ELECTRICAL, Power Supply , Field Wiring

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Rosemount Model 444 Alphaline Temperature Transmitters

2-4

ELECTRICAL

CONSIDERATIONS

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.

Power Supply 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.

FIGURE 2-3. Model444

Load Limits.

Field Wiring

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.

Load (Ohms)

Operating

Region

1650

1500

1000

500

0

PowerSupply Load Limitations

RLOAD(MAX.) =503(V(MIN.)– 12)

12 20 30 40

Power Supply (V dc)

Voltage

Too Low

Explosions may result in death or serious injury.

Do not remove the instrument cover in explosive

atmospheres when the circuit is alive.

High voltagetha tmay be present on leads can cause

electrical shock. Avoidcontact with leads and terminals.

Do not apply high voltage (e.g. ac line voltage)to the

transmittert erminals.A bnormally high voltagecan damage

the unit.

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