Fisher 444 Alphaline LOW-POWER TRANSMITTER

Rosemount Model 444 Alphaline Temperature Transmitters

3-8

FIGURE 3-5. Ice Bath

Calibration Diagram.

CALIBRATING A

LOW-POWERTRANSMITTER

Calibration Equipment Required

Volt met er. Such as a 5-digit DVM. Accuracy is ±0.01%; resolution is 1 mV.

dc Power Supply. Power capability is 5 V dc at 1.5 mA for Model 444LL and 8 V

dc at 2 mA for Model 444LM.

Resistance Decade Box. Precision type, 5-dial, with largest dial providing 100-

ohm steps. Accuracy is ±0.02 ohm. The decade box should be periodically

calibrated against a 5-dial Wheatstone bridge.

Lead Simulation Resistors. If the transmitter is to be mounted remote from the

RTD, and the lead resistance between the transmitter and the RTD is greater

than 2 ohms per lead (equivalent to 200 ft of 20 AWG wire), the transmitter

should be trimmed with simulated lead resistances for best accuracy. This

requires wirewound resistors with resistance values equal to the nominal lead

resistance of the RTD.

Load Resistor. If the transmitter is to be operated with a load that is

significantly different from the DVM used for calibration, a load resistor can be

used for best calibration accuracy. A metal film, carbon comp, or wirewound

resistor, as well as a decade box can be used to simulate the actual load.

444-0217A

DVM

DVM

Power

Supply

(Alternate Readout)

Thermocouple

Wire

Input

Monitor

DVM

Millivolt

Source

Ice Bath

+

–

+

–+–

+

–

–

+

+

–

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