SMART RAIL MOUNTED TRANSMITTER / CONDITIONER SEM220 and SEM230
	Smart DIN Rail Mounted Intrinsically Safe Option Universal Input Isolation Very Stable
INTRODUCTION Smart transmitters provide better accuracy and stability than their analog counterparts, greater flexibility and the ability to interface with a Personal Computer or Process control System.  This means that sensors and ranges can be changed without the need for re-calibration or jumper changes. The SEM220 & SEM230 Smart DIN Rail Transmitters provide current output (or a voltage by the addition of an external resistor) from any of the common industrial sensors.  All versions feature isolation from the power supply and input to output isolation. The SEM230 can have an optional dual relay alarm, and the SEM230XM is a version with FM approval for use with sensors in hazardous areas without the use of barriers. ACCURACY and STABILITY The  are micro-processor based and feature automatic self calibration of span and zero which results in excellent short and long term accuracy and repeatability.  Linearization is performed digitally to ensure drift free performance.

INPUT SPECIFICATION @ 68 °F

OUTPUT PERFORMANCE (source or sink)

GENERAL SPECIFICATIONS

APPROVALS

SEM220 LOW COST SMART TRANSMITTER / CONDITIONER

BENEFITS
The SEM220 is a 'SMART' Transmitter/Conditioner that accepts any of the common industrial sensors and provides isolation between input, output and power supply.  It also accepts a wide range of current and voltage inputs.

TEST
The SEM220 is micro-processor based and features automatic self calibration of span and zero which results in excellent short and long term accuracy and repeatability.  All linearization is performed digitally to ensure drift free performance.  These feature assure a high degree of confidence in the correct operation of the instrument together with a low cost of ownership.

PROGRAMMING
Programming is achieved by means of a host computer via an SEM200 interface cable to a connector on the front face of the unit.  Programming is by simple menu selections presented on the host screen.  Sensors and ranges can be changed without the need for re-calibration or jumper changes.  RS232 capability is provided.

CALIBRATION
The unit is supplied factory calibrated.  Calibration data is stored in EEPROM, field recalibration is possible although this is not normally necessary for 5 years.

SYSTEM HEALTHY
A green front panel LED flashes periodically to indicate system health (OK).  A steady LED indicates that an error condition has been detected.  LED off indicates a loss of power.  A fast 'flash' indicates the sensor is under or over range.

SEM230 EVEN SMARTER TRANSMITTER / CONDITIONER

BENEFITS
In addition to all the features of the SEM220, the SEM230 offers the following additional feature:

• Additional level of input isolation
• RS485 Multi-drop Communications
• Automatic or Programmable cold junction
• Non-linear input (Square root, Power 3/2, Power 5/2)
• User defined linearization
• FM approval
• 24VDC Internal Transmitter supply
• Alarm Relays option
• Output Test Connector
• Intelligent software filter
• Peak & Valley Capture / Hold
• Watchdog Relay option
• Programmable safety condition

TEST
The design incorporates a WATCHDOG and a programmable safety condition (0 to 100%).  In the event of an input out of limits, or input failure, or if an error is detected and the transmitter is unable to continue to function satisfactorily, the transmitter goes to the safety condition, and the system health LED is switched permanently on.  If the input is over or under range, the LED flashes at a faster rate.  In practical terms it is not possible to guarantee that all potential types of error will result in fail safe operation.  It is therefore recommended that standard process control procedures are followed; that in critical applications a secondary back up system is employed.

ALARM RELAYS
Alarm relays can be supplied as an option.  These are two individual relays with a common connection and each may be configured independently as a high, low or deviation alarm.  An additional feature enables the relays to be used as system healthy alarms.  Each relay has an associated LED which is illuminated to show the alarm state.

ISOLATION
The input, output and communications circuits are fully isolated from each other to 500 VAC rms.  All circuits are isolated from the power supply to 1.5 kV.

HAZARDOUS AREAS
Two versions of the SEM230 are available, the SEM230 for general applications and the SEM230XM for hazardous area applications.  Although both versions need to be mounted in a safe area, the SEM230XM has an isolated and intrinsically safe 'front end' which means that sensors can be connected directly into the hazardous area WITHOUT BARRIERS, full isolation is maintained between inputs and outputs.  
The IS approval is by FM and BASSEEFA [EEx ia] IIC and sensors can be mounted in Class I, II, III, Div 1, GPS A-G.  The alarm relay option can also be used provided two independent trips from a hazardous area sensor.

PROGRAMMING
Programming is achieved using a standard PC via a connector on the front face of the unit.  RS485 multi-drop comms is standard, enabling 32 x SEM230s to be connected together without any additional interface.  Up to 99 units may be added to the network with suitable buffering.  Programming is by simple menu selections presented on the host screen.

REMOTE DISCRETE INPUTS
The SEM230 can accept two external dry contacts (or logical inputs) that may be used to reset or inhibit alarms and reset peak/valley memories respectively.

INTERNAL POWER SUPPLY

ORDER CODE

SEMxxx   /   OPTION   /   SUPPLY