The Tracker 300 series is a low cost Signal Conditioner, Trip Amplifier and PID Controller, for use in a variety of process applications. Its small size enables high packing density on standard TS35 DIN rail. A built-in power supply, transmitter excitation and serial RS485 interface provides genuine single loop integrity with distributed data acquisition and control.

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Features

• DIN-Rail Mountable
• Universal 20 bit input provides accurate measurement of a wide range of sensors
• Real time data available via the isolated RS485 serial interface
• Fully configurable by PC software – no internal links or potentiometers

Signal Conditioning

The isolation provided in the Tracker 300 series eliminates earth loops, which can cause noisy, inaccurate measurements. Any Tracker 320 or 330 module can be fitted with an isolated analog output for signal re-transmission.

• Accurate analog re-transmission of 1 part in 32,000 (15bit) 4-20mA, 0-20mA or 0-10VDC output
• Linearization of thermocouple and RTD sensors, so the output is linear to temperature
• User configurable linearization for applications such as tank contents measurements

Distributed Data Acquisition

Often the largest expense of a data acquisition system is the wiring. The Tracker 300 uses a simple two-wire communications link, greatly reducing wire costs and simplifying installation.

• Will power a two-wire transmitter (24VDC) or a strain gauge device (10VDC)
• Enables wiring runs of up to 1.2km on RS485 interface, allows distribution to a single channel
• MODBUS RTU communications protocol allows easy integration with industry standard software

PID Control

The Tracker 331 and 332 modules are fully featured auto tuning PID controllers providing genuine single loop integrity to plant control systems.

• Auto-tune for automatic setting of the PID values; reverse or direct acting
• "Self defence" feature ensures safe operation of the process should there be a loss of communication for longer than a pre-set period
• Can use pulse width modulated SSR / relay logic or analog outputs

Condition Monitoring

Plant shut downs can be time consuming and expensive. The Tracker 300 series allows the user to plan more effective maintenance by monitoring thermocouple ageing and the health of electrical loads.

• Alarms when thermocouple shows signs of deteriation
• Checks for partial electrical load failure, overloads, and open loads (PWM control only)
• Indicates which components should be replaced during scheduled maintenance

Flexible Alarm Trips

The Tracker 300 series can be used as a trip amplifier by using the dual relays on the Tracker 331 or by adding a Tracker 340 Logic Expansion Module to any module in the series.

• The use of on and off delay timers and hysterisis functions stops nuisance or "fleeting" alarms
• An alarm can operate more than one output, allowing different circuit voltages to be switched
• Alarm actions can be high, low, or deviation; latching or non-latching; standard or fail safe operation
• Alarm Blocking feature for startup conditions

Logic Expansion

The Tracker 340 Logic Expansion Module provides additional logic inputs and outputs for monitoring and control applications. All logic states can be read via the communications interface. Logic inputs can also be configured to perform a number of functions, i.e. zero, tare, reset max/min.

• Four C/O relay or TTL outputs and two logic inputs
• Six front panel LEDs indicate the input and output states
• Plugs into and is powered by a Tracker 320 or 330

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Comparison Chart

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Specifications

Math Functions
18 Point user linearization, Max/Min (Peak/Valley) memory
Square root, S.G. Correction, Zero, Tare

Alarm Functions
High, Low, Deviation (band), on delay time, off delay time, hysterisis, output selection (one alarm can switch more than one output)
Outputs energised or de-energised in the alarm state

PID Control (T331 & 332 Models only)
Type: PID with Auto-tune, PWM Logic or Analog outputs
Control Action: Reverse, Direct, or Heat/Cool
PWM Cycle Times: 0.1sec to 30mins (Independent per output)
Auto / Manual switching: Via logic input (T340) or Communications Load and Partial Electrical Load Failure Function (PWM outputs only)

A/D Converter
Type: Sigma Delta, Resolution: 20 Bit plus Sign
Drift with temperature: <100ppm/°C
Update Rate: 15 per second (7.5 per second for PV measurement)
Common / Series mode rejection: >150dB / >70dB (50 & 60 Hz)

Thermocouple/RTD Measurement
Linearized ranges: Types J, K, T, N, B, S, R Thermocouples and 3 wire RTD Pt100 (alpha=385) and Pt100 (alpha=392)
Typical accuracy: Base Metal ± 0.5°C, Rare Metal ± 1.2°C, RTD 0.3°C. Engineering units: °C, °F, or Kelvin
RTD Excitation current 0.25mA (Nom)
Thermocouple ageing feature and open circuit alarms

DC Voltage, Current, & Resistance Inputs
Ranges (Impedance): ± 100mV (1000M), ± 10VDC (1M), and ± 20mA (<5)
Accuracy: 0.02% Typical

Sensor Excitation Supply (Tracker 321 & 322)
Two Wire Loop Supply: 24VDC (Nom) @ 35mA max
Bridge Supply: 10VDC Regulated @ 35mA max

Logic Outputs (Tracker 331 only)
Relays Type: 1 x Normally open contacts (Optionally 2 - No SSR)
Rating: 1 Amp @ 240VAC, 5 Amp @ 30VDC
SSR Drive output: 1 x 18VDC @ 20mA nominal

Serial Communications Interface
Type: RS485, 2-wire multidrop
Isolation: 500V DC/peak AC
Baud rate: Up to 19200
Protocols: Modbus RTU, Modbus Floating point and DTPI (ASCII)

Analog Output (Option for all models)
Isolation: 500VDC / Peak AC
Output: Selectable 0-10V, 0-20mA or 4-20mA, Scalable
Maximum Load (mA): 1000 Ohms
Resolution: 15bit (1 part in 32768)

Tracker 340 Logic Modules (Option for all models)
Relays Types (4): Volt Free Change over contacts (TTL options)
Rating: 1 Amp @ 250VAC, 5 Amp @ 30VDC
Logic Inputs (2): Volt free contacts or TTL

Physical Dimensions
Width: 22.5mm
Height: 99.0mm
Depth: 112.6mm (114.5mm when mounted on Din Rail TS35 / TS35D)

Environmental
Temperature: 0-60°C Operating, -10 to 70°C Storage
Humidity: 10-95% RH non-condensing

Safety and EMC
Safety: EN61010
Susceptibility: EN50082-2
Emissions: EN50081-1
CE certified 2004