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00809-0100-4263
English
Rev. AA
®
Model 444 Alphaline
Temperature
Transmitters
Product Discontinued
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D E T U. Product M an ual 1 ® Model 444 Alphaline Temperature Transmitters NOTICE Read thi s m anual bef ore w or ki ng wi th the pr oduc t. F or per s onal and s ystem s af e ty , a nd f or opti m u m p rodu ct perf or m an ce , m ak e s u re y o u th orou gh ly un ders ta nd t he con ten ts bef ore i ns ta lli ng, us ing , or ma int ain ing thi s p rod uc t. Wi thi n the Uni ted St a tes , Ro s e m o u n t I nc . has two t oll -free a s s i s t an ce n u m b e rs . Customer Central: 1 -800 -99
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Table of Contents Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 SECTION 1 Introduction Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 SECTION 2 General Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 Installation Mechanical Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2 Mounting Stability . . . . . . . .
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Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1 SECTION 4 Hardware Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1 Maintenance and Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1 Troubleshooting Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2 Disassembly Procedure . . . . . . . . . . . .
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Section 1 Introduction This manual is designed to assist in installing, operating, and OVERVIEW ® ® maintaining Rosemount Model 444 Alphaline Temperature 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
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Rosemount Model 444 Alphaline Temperature Transmitters 1-2
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Section 2 Installation This section includes the following transmitter installation OVERVIEW 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 Proced
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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
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Installation FIGURE 2-1. Recommended Process Mounting. Union or Coupling Thermowell Hex Sensor Hex Extension Nipple Transmitter Conduit for Field Wiring Thermowell (dc Power) Extension 3.2 Length (81.3) NOTE Dimensions are in inches (millimeters). FIGURE 2-2. Recommended Process Mounting with Drain Seal. Union or Coupling Sensor Hex Extension Coupling Nipple Close Nipple Street Ell Transmitter Terminal Side Drain Seal Conduit for Field Wiring (dc Power) 2-3 444-0200C 444-0200F
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Rosemount Model 444 Alphaline Temperature Transmitters This section contains information that you should consider when preparing to ELECTRICAL install Model 444 transmitters. Read this section carefully before going on to the CONSIDERATIONS 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 Power Supply voltage versus load limitation relation
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Installation FIGURE 2-4. Field Wiring for the Standard Model 444 Transmitters. Meter Connections (+) (+) dc Power and Signal { Test Points (–) (–) + +– – + RTD Input (typical) – +– + Optional Ground Span Adjust Zero Adjust FIGURE 2-5. Field Wiring for Low-Power Model (+) dc Power Output Load Limitation 444 Transmitters Minimum Load = 100K (444LL and LM). (–) Common Output Voltage (+) Shield Power AtoD Supply Converter RTD Input Optional Ground Span Adjust Zero Adjust Sensor Connections Explosion
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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 Signal Si
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Installation Thermocouple or In the case of thermocouples, make connections between the sensor and the Millivolt Inputs 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 Millivol
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Rosemount Model 444 Alphaline Temperature Transmitters The transmitter will withstand electrical transients of the energy level usually Surges/Transients encountered in static discharges or induced switching transients. However, high- energy 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 Prot
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815 °C (1500 °F) 540 °C (1000 °F) 250 °C (482°F) Oven Temperature Oven Temperature OvenTempera ure t Installation FIGURE 2-9. Model 444 60 Transmitter Housing (108) Temperature Rise. Transmitter Housing Temperature Rise vs. E Length for a Test Installation 50 (90) 40 (72) 30 HOUSING (54) RISE ABOVE AMBIENT 22 20 °C (°F) (36) 10 (18) 0 3 4 5 6 7 8 9 3.6 Length in Inches E FIGURE 2-10. Sensor Assembly Dimensional Drawings. Connection Head with Extended Cover ½–14 NPT Thread Bayonet Spring Loaded S
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Rosemount Model 444 Alphaline Temperature Transmitters The transmitter is designed to resist attack by moisture and other corrosives. Moist or Corrosive The coated circuit boards are mounted in a compartment completely sealed from Environments 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 condui
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Installation Installation consists of mounting the transmitter and sensor assembly and INSTALLATION making electrical connections. If mounting the transmitter directly to the sensor PROCEDURE 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
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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,
