HART TEMPERATURE TRANSMITTERS
SEM310 HART Temperature Transmitter
SEM310 IN-HEAD SEM315 DIN RAIL MOUNT

 

  • HART Protocol

  • Universal Input

  • Also Computer Programmable

  • Sensor Burnout Detect

  • Isolation To 500VAC

INTRODUCTION
The SEM310 is an encapsulated in-head temperature transmitter that replaces the standard connecting block in the sensor head.  It is small in size yet has a performance superior to other larger and more expensive transmitters.  Also available in DIN rail mount format packaging SEM315.

The SEM310 and SEM315 have full HART communications protocol which allows the user to quickly and easily download information or interrogate the device enabling the following:

  • Simple re-ranging of sensor type and range.
  • Easy on site re-calibration.
  • Self documentation.
  • Operation with proprietary software packages such as AMS Plant Web™ and Cornerstone™.
  • Remote configuration on the 4 to 20 ma loop with a hand held communicator or with a PC & HART modem.
  • Online Digital Communication concurrent with 4 to 20 ma analog signal.

All the standard HART universal and common usage commands are fully implemented, with other device specific commands that enable access to the enhanced performance parameters of the SEM310 and SEM315.

Some of the enhanced SEM310 and SEM315 features are as follow:

Sensor Referencing
 The SEM310 and SEM315 sensor referencing via the Windows based RCP2 software allows for close matching to a known reference sensor eliminating possible sensor errors.

User calibration
In addition to sensor referencing, user offset and current output trimming is possible via the HART commands.

Custom Linearization
The [X] facility allows the SEM310 and SEM315 to be programmed with a custom linearization to suit non standard sensors or sensors with unusual or unique characteristics.  Consult the sales office for details.

Sensor Burn out detection
If any sensor wire is broken or becomes disconnected the SEM310 and SEM315 output will automatically go to its user defined level (upscale or downscale).  This happens irrespectively of which wire is broken.

Output current preset
For ease of system calibration and commissioning the output can be set to a predefined level anywhere in the 4-20 ma range.


INPUT SPECIFICATION @ 68 °F       INPUT SENSORS AND RANGE

.RTD (Pt100)   -   2, 3 or 4 wire
.Sensor Range .-328 to +1562 °F [18-390 ohms]
.Minimum Span **** .77 °F
.Linearization .BS EN60751 / BS1904
.DIN43760 / JISC 1604
.CUSTOM *
.Basic Measurement Accuracy .±0.01% Full Range Input ±0.07% Reading
.Thermal Drift .Zero = 0.008 °F/°F
.Span = 75 ppm/°F
.RTD Excitation Current .300 µA to 550 µA
.Maximum lead resistance .50 ohms/leg (balanced for 3 wire)

 

.THERMOCOUPLE
.Thermocouple Type Measuring Range °F *** Minimum Span °F ****
.TC Type K -328 to 2450 90
.TC Type J -328 to 2192 90
.TC Type T -346 to 752 45
.TC Type R 14 to 3200 180
.TC Type S 14 to 3200 180
.TC Type E -328 to 1832 90
.TC Type F (L) -148 to 1112 45
.TC Type N -292 to 2372 90
.TC Type [X] ±9999 Custom
.Basic measurement accuracy ** .±0.04% Full Range Input ±0.04% Reading
.or 0.25 °F (whichever is greater)
.Linearization .BS EN 60584-01 / BS 4937 / IEC 584-1
.Cold Junction Error .±0.25 °F
.Cold Junction Tracking .0.05 °F/°F
.Cold Junction Range .-40 to +185 °F
.Thermal Drift .Zero = 0.05 µV/°F
.Span = 50 ppm/°F

 

.MILLIVOLTS
.Input .Voltage Source
.Range .-10 to +75 mv
.Characterization .Linear
.Custom (5th order polynomial) *
.Minimum Span **** .5 mV
.Basic Measurement Accuracy ** .±10 µV ±0.07% of Reading
.Input Impedance .10 M ohms
.Thermal Drift .Zero = 0.05 µV/°F
.Span = 50 ppm/°F

 

.SLIDEWIRE
.Input .3 wire potentiometer
.Resistance Range .10 to 390 ohms [End to End]
.Larger values can be accommodated by using an external resistor.
.Characterization .Linear
.Custom (5th order polynomial) *
.Minimum Span **** .5% of Full Range Input
.Basic measurement accuracy .0.1% of Full Range Input
.Thermal Drift .Zero = 0.003% of Span/ºF
.Span = 50 ppm/°F

 

.Notes for Input Specifications:
.*       
.**
.***
.****		 Custom characterization is available pre-programmed at the factory.
Includes the effect of calibration, linearization and repeatability.
Consult Thermocouple reference tables for practical temperature range.
Any span may be selected but full accuracy is only guaranteed for spans greater than minimum specified.

OUTPUT
.Output Range .4 to 20 ma (>3.8 to <21.0 ma)
.Accuracy .±5 µA
.Voltage effect .0.2 µA/V
.Thermal drift .0.5 µA/°F
.Supply voltage .10 to 35 V
.Max. output load .[(V supply - 10)/21] K ohm
.250 ohm minimum loop load. Supply voltages over 30 V require a minimum loop load of 500 ohms.


GENERAL SPECIFICATIONS

.Input/Output isolation .500 VAC (tested to 3000 VAC)
.Update time .250 ms maximum
.Response time (filter OFF) .0.5 second (to 90% of final value)
.Filter Factor Programmable: .Off, selectable between 1 to 32 seconds
.Or Adaptive
.Warm up .2 minutes to full accuracy
.Re-calibration interval .1 Year, to maintain to published specs.
.5 Years, to maintain accuracy to less than twice published specs.


APPROVALS

.EMC .Emissions .BS EN 50081-1
.Susceptibility .BS EN 50082-2
.Hazardous area .FM3610 & EEx ia IIC T4..T6 (not SEM315)


ENVIRONMENTAL

.Ambient operating range .-40 to 185 °F
.Ambient storage temperature .-58 to 185 °F
.Ambient humidity range .0 to 100% RH non-condensing
.I.S. version 0-100% RH


ENCLOSURE

.Material .ABS
.Flammability .SEE UL94-V0
.Spring mounting .Free kit with each transmitter

RCP2 SOFTWARE
Communicating with the SEM310 and SEM315 HART transmitters
The SEM310 and SEM315 can communicate digitally, concurrent with the analog 4-20 ma output signal.  This can be achieved in a number of ways namely:
  • Proprietary hand held communicator
  • PLC's, DCS's etc with HART interface
  • PC Computers using RCP2 and a HART modem

Communicating with a Hand Held Communicator
SEM310 and SEM315 will communicate with any proprietary HART communicator and access to all universal commands is available from the communicator.   In order to access all the parameters available, the communicator must have the correct HART Device Description (DD) installed.  Contact the communicator provider or 'Support @ Sandelius' to enable up-grading of communicators that do not contain the right DD.

Communicating with PLCs or DCSs
Any system that supports HART field devices using such software packages as AMS-Plant Web™ or Cornerstone™ will communicate with the SEM310 and SEM315 enabling access to advanced system features such as self documentation and diagnostics.  The correct DD must be installed for full access to all parameters.

Communicating with a PC
Communicating with a PC is easily accomplished by using the HART modem supplied with the communications kit, and RCP2 software.  RCP2 is the menu-driven software product from SandeliusInstruments which runs under Windows 95, 98 or NT and enables the following functions to be quickly and easily performed:

  • Change sensor type, range, select burnout direction, filter (damping) factor
  • Set tag numbers, assembly numbers, calibration details, message etc.
  • Print or save to file all relevant documentary information
  • Read next calibration date
  • Perform basic calibration
  • Monitor sensor Sandeliusand read transmitter diagnostics
  • Real-time reading of process variable
  • Supports up to 15 devices in multi-drop mode

RCP2 software is very 'User-friendly' and can be used immediately without extensive training.  The user is guided through a series of simple menu screens where the information is clearly and logically represented.  It is available in English and many other languages (contact sales office for latest information)


HART Field Communication Protocol
HART (Highway Addressable Remote Transducer) is a communications protocol used to 'talk' to field devices digitally while, at the same time, using the industry standard 4-20 ma analog transmission.  It is widely used in process industries such as chemical, oil refining, pulp and paper, food and pharmaceuticals.

The HART protocol uses the Bell 202 frequency-shift-keying (FSK) standard to superimpose a sinusoidal signal on top of a 4-20 mA analog signal, a logical 1 being represented by 1.2K Hz and 0 by 2.2K Hz.  The FSK technique means that digital signals and the analog 4-20 ma can be used concurrently, thus HART provides bi-directional digital data interchange while maintaining compatibility with older 4-20 ma systems.   Although it was originally conceived as a master-slave, single loop implementation with up to two masters, there is also a multi-drop operating mode accommodating up to 15 slave devices.

The protocol provides three command groups:

**********
Universal Commands.
These provide functions that must be implemented in all field devices, such as "Read unique identifier (manufacturer, device type, etc.) or "Read Primary Variable (PV)".
Common Practice Commands
These provide functions common to many, but not all, field devices, for example "Write transmitter range values", "Write PV Units".
Device Specific Commands
These provide functions which are more specific to a particular device, for example "Read Sensor Type, No. of wires, burnout"
***********
Multi-drop HART
As well as operating in standard mode the SEM310 and SEM315 support HART multi-drop mode whereby up to 15 devices can be connected to the same pair of wires enabling full digital functionality with each device.

The below table shows the full range of HART commands implemented in the SEM310 and SEM315.  Full access to all these parameters is available via a PC running RCP2 but in order to gain access to the full list a third party communicator, the correct Device Description Language must be installed.  Contact SandeliusInstruments Inc. for communicator upgrade.

The increasing use of 'Smart' equipment will see a marked rise in the application of digital field bus technology, of which HART may be considered to be the most widely available with the most installations.  With the trend towards smarter systems with all the advantages that they offer to the user and the falling cost of HART products, many customers now expect to have HART protocol as standard in any instrument that they purchase.

More information can be obtained on HART from the HART Communication Foundation on their web site at http://www.hartcomm.org.

**************************************
GROUP COMMAND

DESCRIPTION

Universal Commands 0 .Read unique identifier
1 .Read primary variable
6 .Write polling address
11 .Read unique identifier associated with tag
12 .Read message
13 .Read tag, descriptor, date
14 .Read PV sensor information
15 .Read output information
16 .Read final assembly number
17 .Write message
18 .Write tag, descriptor, date
19 .Write final assembly number
Common-Practice Commands 34 .Write damping value
35 .Write range value
40 .Enter/exit fixed current mode
44 .Write PV units
45 .Trim DAC zero
46 .Trim DAC gain
48 .Read additional transmitter status
Device-Specific Commands 130 .Read sensor type, number of wires, burnout
131 .Write sensor type, number of wires, burnout

SEM310 Instruction Manual

SEM315 Instruction Manual


ORDER CODE

.SEM310 Standard HART transmitter (Default Pt-100 range 0-100ºC)
.SEM310X Approved for Hazardous Area Use to FM3610 and EEx ia IIC T5
.SEM315 Standard HART DIN Rail Mount Unit
.CONFIG 310 Pre Configured to Specified Range (State Range on Order)
.RCP2 Software & Manual
.RCP2-KIT-USA Programming Kit for SEM310/SEM315
.Consisting of: I/F Adapter Box, RCPW Software, PSU and Carry Case.
.(Kit for USA/Canada)


Call (713) 861-1100 for literature and pricing. If you prefer to ask for information via the internet, email info@sandelius.com.

 

© 2001 Sandelius Instruments, Inc. - All Rights Reserved