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3331
Temperature converter, loop-powered - isolated
- Excellent accuracy, better than 0.05% of span
- Slimline housing of 6 mm
- Excellent EMC performance and 50/60 Hz noise suppression
- Selectable < 30 ms / 300 ms response time
- Pre-calibrated temperature ranges selectable via DIP-switches
Application
- The 3331 temperature converter measures a standard Pt100, TC J and K temperature sensor, and provides an isolated passive analog current output signal.
- High 2 port isolation provides surge suppression and protects the control system from transients and noise.
- The 3331 can be mounted in the safe area or in Zone 2 / Division 2 areas.
- Approved for marine applications.
Technical characteristics
- Flexibly loop powered by 5.5...35 VDC via connectors.
- < 30 ms fast response time with simultaneous sensor error detection when selected.
- Selectable 300 ms response time when signal dampening is needed.
- Selectable internal/external CJC.
- Excellent conversion accuracy in all available ranges, better than 0.05% of span.
- Meeting the NAMUR NE21 recommendations, the 3331 provides top measurement performance in harsh EMC environments.
- The device meets the NAMUR NE43 standard defining out of range and sensor error output values.
- All terminals are protected against overvoltage and polarity error.
- High galvanic isolation of 2.5 kVAC.
- Excellent signal/noise ratio of > 60 dB.
Mounting / installation / programming
- Selectable DIP-settings for easy configuration of more than 1000 factory calibrated measurement ranges.
- The narrow 6 mm housing allows up to 165 units to be mounted per meter of DIN rail, without any air gap between units.
- Wide ambient temperature range of -25...+70°C.
Environmental Conditions
| Operating temperature | -25°C to +70°C |
| Storage temperature | -40°C to +85°C |
| Calibration temperature | 20...28°C |
| Relative humidity | < 95% RH (non-cond.) |
| Protection degree | IP20 |
| Installation in | Pollution degree 2 & meas. / overvoltage cat. II |
Mechanical specifications
| Dimensions (HxWxD) | 113 x 6.1 x 115 mm |
| Weight approx. | 70 g |
| DIN rail type | DIN EN 60715/35 mm |
| Wire size | 0.13 x 2.5 mm2 / AWG 26...12 stranded wire |
| Screw terminal torque | 0.5 Nm |
| Vibration | IEC 60068-2-6 |
| 2...25 Hz | ±1.6 mm |
| 25...100 Hz | ±4 g |
Common specifications
Supply |
|
| Supply voltage | 5.5...35 VDC |
| Max. required power | 0.80 W |
| Internal power dissipation | 19 mW...0.8 W |
Isolation voltage |
|
| Isolation voltage, test / working | 2.5 kVAC / 300 VAC (reinforced) |
| Zone 2 / Div. 2 | 250 VAC |
Response time |
|
| Response time (0...90%, 100...10%) | < 30 ms / 300 ms (selectable) |
| Voltage drop | 5.5 VDC |
| Signal / noise ratio | Min. 60 dB |
| Programming | DIP-switches |
| Signal dynamics, input | 23 bit |
| Signal dynamics, output | 18 bit |
| EMC immunity influence | < ±0.5% of span |
| Extended EMC immunity: NAMUR NE21, A criterion, burst | < ±1% of span |
| Incorrect DIP-switch setting identification | 3.5 mA |
Input specifications
RTD input |
|
| Temperature range, Pt100 | -200...+850°C |
| Min. measurement range (span) | 10°C |
| Accuracy: the greater of | Better than 0.05% of span or 0.1°C |
| Temperature coefficient: the greater of | 0.02°C/°C or ≤ ±0.01%/°C |
| Sensor current | < 150 µA |
| Sensor cable resistance | < 50 Ω per wire |
| Effect of sensor cable resistance (3-/4-wire) | < 0.002 Ω / Ω |
| Sensor error detection | Yes - selectable via DIP-switch |
| Broken sensor detection | > 800 Ω |
| Shorted sensor detection | < 18 Ω |
TC input |
|
| Temperature range, TC J | -100...+1200°C |
| Temperature range, TC K | -180...+1372°C |
| Min. measurement range (span) - TC J & K | 50°C |
| Accuracy: the greater of | Better than 0.05% of span or 0.5°C |
| Temperature coefficient: the greater of | 0.1°C/°C or ≤ ±0.01%/°C |
| Sensor cable resistance | < 5 kΩ per wire |
| Cold junction compensation (CJC): Accuracy @ external Pt100 input | Better than ±0.15°C |
| Cold junction compensation (CJC): Accuracy @ internal CJC | Better than ±2.5°C |
| Internal CJC error detection | Yes |
| External CJC error detection | Yes - selectable via DIP-switch |
| Open Thermocouple detection | Yes - selectable via DIP-switch |
Output specifications
Common output specifications |
|
| Updating time | 10 ms |
Current output |
|
| Programmable signal ranges | 4...20 and 20...4 mA |
| Load (@ current output) | ≤ (Vsupply - 5.5) / 0.023 [Ω] |
| Load stability | ≤ 0.01% of span / 100 Ω |
| Sensor error indication | 3.5 mA or 23 mA / acc. to NAMUR NE43 or OFF |
I.S. / Ex marking
| ATEX | II 3 G Ex nA IIC T4 Gc |
| IECEx | Ex nA IIC T4 Gc |
| FM, US | Cl. I, Div. 2, Gp. A, B, C, D T4 or Cl. I, Zone 2, AEx nA IIC T4 |
| FM, CA | Cl. I, Div. 2, Gp. A, B, C, D T4 or Cl. I, Zone 2, Ex nA IIC T4 |
Observed authority requirements
| EMC | 2014/30/EU |
| LVD | 2014/35/EU |
| RoHS | 2011/65/EU |
| EAC | TR-CU 020/2011 |
Approvals
| ATEX 2014/34/EU | KEMA 10ATEX0147 X |
| IECEx | KEM 10.0068X |
| FM | FM17US0004X / FM17CA0003X |
| DNV-GL Marine | Stand. f. Certific. No. 2.4 |
| UL | UL 61010-1 |