Answer / carl_ellis

Given that 2 wire loop powered transmitters need approvals
for use in hazardous areas to be competitive, most, if not
all, transmitters regulate what changes can be made to
their products by limiting what spare parts or updates can
be made to an original product.

A hazardous area approval (FM, ATEX) is granted for the
transmitter as it is submitted to the approval agency.
Changes to the transmitter require re-approval with all the
associated costs of re-approving a device.

Changing the internal firmware or any of the internal
hardware would void the approval on the original device.
That could make the manufacturer liable in case of failure
of the instrument.

Firmware revisions are not offered for the base functions
of field transmitters.

An accessory item, like a digital display, that is not a
core element of the measuring and reporting function can
sometimes be swapped out with other units of different
firmware versions.

Sensor bodies for pressure transmitters and entire
electronic heads can be exchanged, or entire electronic
card assemblies can be exchanged, but firmware updates are
not available for devices that have agency approvals for
hazardous areas.

Software drivers for communications protocols change over
time and matching the firmware revision of a field
transmitter to its DD (Device Descriptor) or EDDL or DTM or
DOF file can be a challenge, but these are software files
used by communicators or PC/modem communication software.
The instrument manufacturer posts these kinds of files on
their web sites for download.

Carl Ellis
Measure First

How oil line flow measured?eplain about instruments used and working principle?

0 Answers  

---

Can 2 transmitters be connected to Integral orifice meter taps? Does an integral orifice comes with 2 set of taps?

1 Answers  

---

WHAT IS THE Differance b/w on/off & pid control valve?

10 Answers  

---

what is the diffrence between plc&dcs

4 Answers   HCL, Hindustan Zinc,

---

How to Calibrate Level Troll in field

0 Answers  

---

How vortex sensor used for steam flow measurment can be checked on line i.e without taking out from process line.

0 Answers   Heisco,

---

how can you set a zero and span of transmitter?

1 Answers   Rockwell,

---

how many types of orifice plates?and explain about it?

2 Answers   Kesoram,

---

what is moisture probe? What are there types? What is there working principle and how they works? guys this is one of technical question I had ask in interview. If you know its answer please let me know. The interviewers were more interested in microwave moisture probe, so if you find its any link please just forward me on my mail id.avinash1200@gmail.com Thanks in advance.

0 Answers  

---

what is the zero and span trim?

2 Answers  

---

Explain the difference between differial pressure & delta pressure?

1 Answers  

---

what is novram ic number of foxboro 762cna microcontroller ?thank

1 Answers  

---