YOKOGAWA UT55A - Heater Break Alarm Specifications; 24 V DC Loop Power Supply Specifications

19-6
IM 05P01C31-01EN
19.1.10 TransistorContactOutputSpecifications
• Number of outputs: See the table of Model and Suffix Codes.
• Output type: Open collector (SINK current)
• Outputcontactrating:Max.24VDC,50mA
• Output time resolution: Min. 50 ms
19.1.11 HeaterBreakAlarmSpecifications
• Number of inputs: 2
• Number of outputs: 2 (transistor contact output)
• Use: Measures the heater current using an external current transformer (CT) and
generates a heater break alarm when the measured value is less than the break
detection value.
• Currenttransformer
inputresistance:About9.4Ω
• Current transformer input range: 0.0 to 0.1 Arms (0.12 Arms or more cannot be
applied.)
• Heater current setting range: OFF, 0.1 to 300.0 Arms
Heater current measured value display range: 0.0 to 360.0 Arms
Note: The CT ratio can be set. CT ratio setting range: 1 to 3300
• Recommended CT: CT from U.R.D., Ltd.
CTL-6-S-H: CT ratio 800, measurable current range: 0.1 to 80.0 Arms
CTL-12L-30: CT ratio 3000, measurable current range: 0.1 to 180.0 Arms
• Heater current measurement period: 200 ms
• Heatercurrentmeasurementaccuracy:±5%ofcurrenttransformerinputrangespan±
1 digit (CT error is not included.)
Ex.: CTL-12L-30
0.1 (Max. of current transformer input range) × 3000 (CT ratio) × ±0.05 (±5%)±
1digit=±15
Arms ± 1 digit
• Heater current detection resolution: Within 1/250 of current tra
nsformer input range
span
Ex.: CTL-12L-30
 0.1(Max.ofcurrenttransformerinputrange)×3000(CTratio)/250=1.2Arms
• Break detection On-time: Min. 0.2 second. (for time proportional output)
19.1.12 24VDCLoopPowerSupplySpecifications
• Use: Power is supplied to a 2-wire transmitter.
• Powersupply:21.6to28.0VDC
• Rated current: 4 to 20 mA DC
• Maximum power supply: About 30 mA (with short circuit current limiting circuit)
19.1HardwareSpecifications