Tracker 220 Series

A Complete Range of Universal Input Digital Panel Indicators for Temperature and Process Measurement

All of the Tracker 220 series can be directly connected to most process sensors including thermocouples, RTDs, 20mA loops, transmitters, or DC type signals. Thermocouple, RTD, 20mA, mV and 10 volt signals are accepted as standard. All thermosensor ranges have built-in linearisation curves with automatic or external cold junction compensation. The display can show °C, °F or Kelvin (Absolute), with the decimal point position being user-adjustable to give the required measurement resolution or switched to automatic (Auto-ranging Mode). The sensor break detection can be selected to produce upscale or downscale readings. Process inputs can be scaled to any engineering unit and can be linear, mapped to one of the thermosensor linearisation curves or be user linearised using the 24-point user linearisation feature

All Tracker 220 models are fitted with a fixed 24 volt DC output that is electrically isolated. This can be used to power a single 20mA 2-wire transmitter. In addition the Tracker models 221 and 222 have a 10V regulated supply and the Tracker models 223 and 224 are fitted with a programmable 0-12 volt DC regulated output. Both the fixed 10V and programmable 0-12V DC supply outputs are primarily designed to power strain gauge-type sensors including load cells

Digital status inputs, serial communications, analogue output, transmitter supply, alarm relays and transducer supply, are all available. The instrument can be removed for routine servicing without disturbing these connections

Models 223 and 224 are fitted with an electrically isolated analogue output which can be configured as 0-10 volt, 0-20mA or 4-20mA and can be scaled over any portion of the display range. For example, a type K thermocouple can be retransmitted as a linear 4-2 mA signal equivalent to 0-1000°C to another device such as a chart recorder or data logger. The output is linear to temperature (display value). The analogue output can be set to transmit the measured (PV) value or the maximum, minimum or the averaged value and has its own damping filter for noisy or fast moving signals. Alternatively the output can be controlled by the serial communication interface

Some applications require a special linearisation curve to be defined by the user. A typical example is tank contents measurement where the pressure of a liquid can be measured, but does not have a linear relationship to the actual volume. User linearisation allows up to 24 calibration points to be defined. Each point can be entered manually or, for greater accuracy, directly from the sensor output, thus removing measurement errors. The 24 readings can be entered in any order. The Tracker 220 will use the stored values to define the required linearisation curve

Each of the Tracker 220 series has 4 software alarms. These can be configured by the user for alarm type, setpoint, on/off delay and on/off hysteresis value. Alarms can be individually set to be latching or non-latching and to flash a message on the front panel display when active. Any of the 4 software alarms can operate a relay (models 222 and 224 only). In addition, a special AND function allows a relay to switch only if 2 or more alarm conditions are active. Relays can be configured to be energised or de-energised in the alarm condition

Full setup is available using the front panel buttons to step through a simple password protected menu. Some functions, such as alarm setpoints, can be made directly available to an operator. Alternatively, units can be supplied without front panel buttons

Two of the front panel buttons can be user programmed to provide one or more special functions such as tare and zero

Both models 223 and 224 are fitted with an electrically-isolated RS 422/485 serial interface. Models 221 and 222 RS485 2-wire communications. All measured values and setup parameters are accessible, however, the instruments can be set to be read only, thus protecting their configuration. Two protocols are available, namely the MODBUS and the proprietary DTPI, which has been designed to be easier to implement. The display, analogue output and transducer supply can all be set or configured via the serial interface

Wide-ranging 90-265V AC input allows world-wide installation. Low voltage AC/DC input option available

Designed to enhance the looks of any instrument panel, the enclosure uses flame retardant (VO) materials and the front panel conforms to IP65 (NEMA 4). The plug in sleeve type construction facilitates simple exchange for routine servicing / calibration

The flat recessed display, together with high brightness red or green LEDs ensure maximum visibility even in difficult ambient lighting conditions