Fisher 444 Alphaline - page 31

3-9

Calibration

Calibration Procedure The following steps describe the procedure for calibrating a low-power

transmitter, as shown in Figure 3-6:

1. Remove the cover from the terminal side of the transmitter housing.

2. If an RTD is already connected, remove all RTD lead connections.

3. Attach the calibration test equipment as shown in Figure 3-6. Make

terminal connections using miniature banana plugs. Use simulated lead

resistors only if necessitated by long lead wire lengths, as discussed above.

NOTE

If using RTD configurations other than the 3-wire design shown in Figure 3-2,

refer to Figure 2-6 on page 2-6 for the correct wiring.

4. Determine the RTD resistance at the desired base- and full-scale

temperatures. For Calibration Code 1 (see Table 5-5), obtain these

resistances from Table B-1.

5. Turn the power on.

6. Set the decade box to the resistance corresponding to the desired base

temperature. Adjust the zero potentiometer until the output is 0.8 V for

Model 444LL or 1.0 V for Model 444LM.

7. Set the decade box to the resistance corresponding to the desired full-scale

temperature. Adjust the span potentiometer until the output is 3.2 V for

Model 444LL or 5.0 V for Model 444LM.

8. Repeat steps 6 and 7 until you obtain both the zero- and full-s cale readings

without adjusting the span and zero potentiometers. Complete this process

more quickly by noting the full-scale reading before readjusting the span

pot, using the span pot to overshoot the desired reading by 20%, and then

using the zero pot to readjust the full scale reading.

9. Disconnect the decade box and the readout. Reconnect the RTD and power

leads. Replace the terminal cover.

10. Mark the correct range in t he “Calibration” space on the nameplate.

FIGURE 3-6. Low-Power

TransmitterCalibration

Diagram.

444-0218A

444LL and LM Transmitter

Decade Box

DVM

dcPower

Source

Lead Simulator Resistors

(If required)

Load Resistors ➀

(If required)

+

––

+

➀Transmittersare calibrated

at the factory with a 220 KV load.

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