Pressure Transmitter 4-20 mA Microprocessor Based

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The LD290 - Pressure Transmitter 4-20 mA Microprocessor Based is the economical alternative in routine gauge pressure measurement. The lightweight design eliminates the need for mounting brackets and transmitter supports in many applications. The model LD290 is a pure 4-20 mA transmitter.

Besides its analog output, its microprocessor-based electronics allow for total interchangeability with SMAR capacitive sensors. It automatically corrects sensor characteristic changes caused by temperature fluctuations. 

Parameterization and Diagnostics

Only configurable using magnetic tool if device is fitted with display.


  • Updating time of output current in 100 ms;
  • With high performance mathematical co-processor;
  • Digital electronics and sensor;
  • Weather proof, explosion proof and intrinsically safe;
  • FMEDA (failure Modes, Effects and Diagnostic Analysis);
  • MTBF (Mean Time Between Failures) of 239 years;
  • MTTR (Mean Time to Repair) of 18 minutes;
  • MTTF (Mean Time to Failure) of 239 years;
  • Applicable in safety areas according to SIL (Safety Integrity Level) requirements;
  • Write protection by hardware;
  • Designed and manufactured according to ISO 9001 standards.



Two-wire, 4-20 mA with HART superimposed digital communication signal


0 to 25 MPa (3600 psi)


Accepts calibration from URL to URL/40


± 0.075% of calibatred span

Power Supply

12-45 Vdc

Update Output Current

100 ms


Analysis done by Exida


239 years




With reference and without reference

Access Protection

Yes, by hardware


Yes, by LCD


Optional 41/2-digit numerical and 5-character alphanumerical LCD indicator

Only Electronic Board

Only electronic board with math co-processor high-performance, interchangeable on all models.

Update for FOUNDATION fieldbus and PROFIBUS PA

With the simple exchange of the main electronic board can be easily converted to these digital protocols.

Ambient Temperature Limits

-40 to 85 ºC (-40 to 185 ºF)

Process Temperature Limits

-40 to 100 ºC (-40 to 212 ºF) (Silicone Oil)
0 to 85 ºC (32 to 185 ºF) (Fluorolube Oil)

Ambient Humidity Limits

0 to 100% RH


Injected low copper aluminum with polyester painting or 316 stainless steel housing. According to the NEMA 4X, IP66.

Wetted Parts

316L SST, Hastelloy C276

Nonwetted Parts

Injected aluminum with polyester painting or 316 SST

Hazardous Area Certification

Intrinsic Safe (FM, CSA, Nemko, Dekra/EXAM, Cepel and NEPSI), non-incendive (FM, CSA and Cepel), explosion proof (FM, Nemko and Cepel) and dust ignition proof (FM).


Less than 2.0 kg (4 lb)

Contact Us

“Industrial Technical Services is a single source Instrumentation and Automation company. We provide certified calibrations, PLC programming, custom controls and Panels”.


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