Digital Meter / Printer
Temperature Measuring Digital Panel Meter
MODEL 451B
- ■ Thermocouple input/Platinum-resistance thermometer input
- ■ High-resolution of 0.1 or 0.01°C display
- ■ Water- and dust-proof IP65 front panel
Model Designation
| 451B | - | □ | - | □ | - | □ |
| ① | ② | ③ |
①Power supply voltage
| Code | Power source voltage |
|---|---|
| A | AC 100 to 240 V |
| B | DC 12 to 24 V |
| C | DC 110 V |
②Data output 1
| Code | Data output | Output impedance | Tolerable Load resistive |
|---|---|---|---|
| Blank | - | ||
| 09 | Analog output DC 0 to 10 V (Available scaling, Default: 1 to 5 V) |
Less than 0.1 Ω | More than 500 Ω (DC 1 to 5 V) More than 1 kΩ (DC 0 to 10 V) |
| 29 | Analog output DC 0 to 20 mA (Available scaling, Default: 4 to 20 mA) |
More than 5 MΩ | 0 to 600 Ω (DC 4 to 20 mA) |
| BP | BCD output (TTL level positive logic) | - | |
| BN | BCD output (TTL level negative logic) | - | |
| DP | BCD output (transistor output, source type) | - | |
| DN | BCD output (transistor output, sink type) | - | |
| E0 | RS-232C | - | |
| E1 | RS-485 | - | |
③Data output 2 (Available- 09 and -29 of ④ Data output 1 only)
| Code | Data output |
|---|---|
| Blank | No output |
| E0 | RS-232C |
| E1 | RS-485 |
Measuring input
Thermocouple
| Sensor | Measuring range | Display range | Accuracy |
|---|---|---|---|
| R | 100.0 to 1700.0°C | -50.0 to 1800°C | ±(0.1% of rdg + 0.6digit) [100.0 to 500.0°C] |
| ±(0.1% of rdg + 0.5digit) [500.0 to 1700.0°C] | |||
| K | -100.0 to 1300.0°C | -200.0 to 1400.0°C | ±(0.1% of rdg + 0.6digit) [-100.0 to 0.0°C] |
| ±(0.1% of rdg + 0.5digit) [0.0 to 1300.0°C] | |||
| E | -130.0 to 1000.0°C | -250.0 to 1050.0°C | ±(0.1% of rdg + 0.5digit) |
| J | -140.0 to 1200.0°C | -210.0 to 1250.0°C | |
| T | -200.0 to 400.0°C | -250.0 to 420.0°C | |
| B | 600.0 to 1800.0°C | -20.0 to 1820.0°C | ±(0.1% of rdg + 0.6digit) |
| N | -100.0 to 1300.0°C | -230.0 to 1350.0°C | ±(0.1% of rdg + 0.5digit) |
Resistance thermobulb
| Sensor | Measuring range | Display range | Accuracy |
|---|---|---|---|
| Pt100Ω range [1] |
-200.0 to 850.0°C | -200.0 to 870.0°C | ±(0.1% of rdg + 0.2digit) [0.0 to 100.0°C] |
| ±(0.2% of rdg + 0.3digit) [-200.0 to 0.0°C] [100.0 to 850.0°C] | |||
| Pt100Ω range [2] |
-150.00 to 150.00°C | -180.00 to 180.00°C | ±(0.1% of rdg + 0.2digit) [0.0 to 100.0°C] |
| ±(0.2% of rdg + 0.3digit) [-150.0 to 0.0°C] [100.0 to 150.0°C] | |||
| JPt100Ω | -200.0 to 645.0°C | -200.0 to 660.0°C | ±(0.1% of rdg + 0.2digit) [0.0 to 100.0°C] |
| ±(0.2% of rdg + 0.3digit) [-200.0 to 0.0°C] [100.0 to 645.0°C] |
Basic Specifications
| Display | 0 to 99999, red or green LED (character height 15.2 mm), “-” polarity, with zero-suppress function. During the measuring mode, the display switches from current value to peak memory, bottom memory, display amplitude, and current value, by pushing PB key. Current value, PB 1 second, Memory, Peak memory, PM illuminates, Bottom memory, BM illuminates, Display amplitude |
|---|---|
| Over-range display | Flashing with minimum or maximum value of display range |
| Resolution | RTD input: 0.1 °C (0.01°C when PT100Ω range 2) |
| Thermocouple input | 0.1 °C |
| External resistance | 500 Ω Max. for Thermocouple input |
| Wire resistance | 5 Ω Max. per wire for Thermocouple input |
| Overload | DC +/- 10 V |
| Sampling rate | Approx. 5 times / s |
| Display cycle | selectable from 200ms, 400ms, 1s, 2s, 4s, 5s |
| Response | within 2 samplings or within display cycle, whichever longer |
| Input method | Single ended, floating input |
| A/D conversion | ⊿-∑ conversion method |
| Noise Rejection | Normal mode (NMR) - More than 50 dB. Common mode (CMR) - More than 110 dB. Noise through power supply line - 1000 V (at AC voltage power supply) |
| Insulation Resistance | -DC 500 V, More than 100 MΩ |
| Withstand Voltage | Input terminals - External case: AC 1500 V each for 1min. Power supply terminals - External case: AC 1500 V each for 1min. Power supply terminals - Input and output terminals: AC 500 V each for 1min. Input terminals - Output terminals: AC 500 V each for 1min. |
| Power Supply | AC 100 to 240V (90 to 250 V) 50/60 Hz, DC 12 to 24 V (9 to 32 V) |
| Power Consumption | 451B itself: Approx. 7 VA at 100 V AC, 9 VA at 200 V AC, 300 mA at 12 V. 150 mA at 24 V DC. |
| Operating Temperature | 0 to 50°C |
| Storage Temperatur e | -20 to 70°C |
| Weight | Approx. 300 g |
| Housing protection | IP65 for the front panel, IP20 for the rear case, IP00 for terminals |
| Mounting Method | Panel mount with the bracket |
