
6437D
2-wire HART 7 temperature transmitter
- RTD, TC, potentiometer, linear resistance and bipolar mV input
- Single input, dual input or 2 channels (2x4 terminals)
- Wide ambient operating temperature of -50 to +85°C
- Total accuracy from 0.014%
- 2.5 kVAC galvanic isolation
- Full assessment to IEC61508 : 2010 for use in SIL 2/3 applications
Application
- Temperature measurement of a wide range of TC and RTD types.
- Conversion of wide span linear resistance and potentiometer inputs to 4...20 mA.
- Conversion of bipolar mV signals to 4...20 mA.
- Integration into asset management schemes.
- Critical applications requiring superior accuracy and/or sensor redundancy and drift detection.
Technical characteristics
- True dual input transmitter, accepts the widest range of dual input combinations.
- Sensor redundancy - output automatically switches to secondary sensor in event of primary sensor failure, maintaining uptime.
- Sensor drift detection - alerts when sensor differential exceeds user-defined limits, for maintenance optimization.
- Dynamic variable mapping for process data in addition to the primary variable e.g. dual input features such as average, differential and min./max. tracking.
- Groundbreaking digital and analog signal accuracy over full input span and ambient conditions.
- Extensive sensor matching including Callendar Van Dusen and custom linearizations.
- Programmable input limits with runtime metering ensure maximum process traceability and sensor out of range protection.
- IEC 61508 : 2010 full assessment up to SIL 3 together with enhanced EMC Functional Safety testing to IEC 61236-3-1.
- Meets NAMUR NE21, NE43, NE44, NE89 and NE107 compliant diagnostics information.
Mounting / installation / programming
- DIN rail mounting with up to 84 inputs per meter.
- Configuration via PReset using PR5909 Loop Link /HART modem, or by Asset Management tool (e.g. Pactware, AMS, HART communicator) for which all relevant DD, eDD and DTM files are available.
- The 6437D can be mounted in zone 0, 1, 2 and zone 20, 21, 22 including M1 / Class I, Division 1, Groups A, B, C, D.
Environmental Conditions
Operating temperature |
-50°C to +85°C (standard)
-40°C to +80°C (SIL) |
Storage temperature | -50°C to +85°C |
Calibration temperature | 23...25°C |
Relative humidity | < 99% RH (non-cond.) |
Protection degree | IP20 |
Mechanical specifications
Dimensions (HxWxD) | 109 x 23.5 x 104 mm |
Weight (single input / dual input) | 150 g / 160 g |
Weight (2 channels) | 185 g |
Wire size | 0.13...2.08 mm2 AWG 26...14 stranded wire |
DIN rail type | DIN EN 60715/35 mm |
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 | 7.5*...30** VDC |
Power dissipation, per channel | ≤ 850 mW |
Additional min. supply voltage when using test terminals | 0.8 V |
Min. load resistance at >37 V supply | (Vsupply – 37) / 23 mA |
Isolation voltage |
|
Isolation voltage, test / working | 2.5 kVAC / 42 VAC |
Response time |
|
Response time | 70 ms |
Programmable damping | 0...60 s |
Polarity protection | All inputs and outputs |
Warm-up time | < 5 min. |
Start-up time | < 2.75 s |
Programming | Loop Link & HART |
Write protection | Jumper or software |
Signal / noise ratio | > 60 dB |
Long-term stability, better than | ±0.05% of span / year (±0.18% of span / 5 years) |
Signal dynamics, input | 24 bit |
Signal dynamics, output | 18 bit |
Effect of supply voltage change | < 0.005% of span / VDC |
Accuracy | See manual for details |
EMC immunity influence | < ±0.1% of span |
Extended EMC immunity: NAMUR NE21, A criterion, burst | < ±1% |
Input specifications
RTD input |
|
RTD type | Pt10...10000, Ni10...10000, Cu5...1000 |
Basic accuracy, e.g. Pt100 | ≤ ±0.04°C |
Cable resistance per wire | 50 Ω (max.) |
Effect of sensor cable resistance (3-/4-wire) | < 0.002 Ω / Ω |
Sensor current | < 0.15 mA |
Sensor error detection | None, Shorted, Broken, Shorted or Broken |
TC input |
|
Thermocouple type | B, E, J, K, L, N, R, S, T, U, W3, W5, LR |
Basic accuracy, e.g. TC K | ≤ ±0.25°C |
Cold junction compensation (CJC) | Constant, internal or external via a Pt100 or Ni100 sensor |
Sensor error detection | None, Shorted, Broken, Shorted or Broken |
Linear resistance input |
|
Measurement range / min. range (span) | 0 Ω...100 kΩ / 25 Ω |
Cable resistance per wire (max.) | 50 Ω |
Sensor current | < 0.15 mA |
Sensor error detection | None, Broken |
Potentiometer input |
|
Potentiometer min....max. | 10 Ω...100 kΩ |
Measurement range / min. range (span) | 0...100% / 10% |
Cable resistance per wire (max.) | 50 Ω |
Sensor current | < 0.15 mA |
Sensor error detection | None, Shorted, Broken, Shorted or Broken |
mV input |
|
Measurement range |
-800...+800 mV (bipolar)
-100 to 1700 mV |
Min. measurement range (span) | 2.5 mV |
Input resistance | 10 MΩ |
Sensor error detection | None, Broken |
Output specifications
Common output specifications |
|
Normal range, programmable | 3.8...20.5 / 20.5...3.8 mA |
Extended range (output limits), programmable | 3.5...23 / 23...3.5 mA |
Basic accuracy | ≤ ±1.6 μA (0.01% of full output span) |
Updating time | 10 ms |
Load (@ current output) | ≤ (Vsupply -7.5)/0.023 [Ω] |
Load stability | < 0.01% of span / 100 Ω |
Sensor error indication | Programmable 3.5…23 mA |
NAMUR NE 43 Upscale/Downscale | > 21 mA / < 3.6 mA |
HART protocol revisions | HART 7 and HART 5 |
Observed authority requirements
EMC | 2014/30/EU |
EAC | Pending |
RoHS | 2011/65/EU |
Approvals
ATEX | DEKRA 16ATEX0047X |
IECEx | IECEx DEK. 16.0029X |
CSA | 70066266 |
c FM us | FM16US0287X / FM16CA0146X |
INMETRO | DEKRA 16.0008 X |
NEPSI | GYJ18.1057X |
EAC Ex | RU C-DK.GB.98.V.00192 |
EU RO MR Type Approval | MRA0000023 |
SIL | SIL 2 / SIL 3 certified & fully assessed acc. to IEC 61508 |
NB
* / ** | See manual for details |

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