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Action Instruments Transmitters

TransPak Process Two-Wire Transmitters 

Selection Guide 
Input Selection Typical Application Product Selection
Universal Input   T280
T287
DC Voltage or Current 
(V, mV, A, mA)
Includes optimum filtering, and conditioning to reduce susceptibility to transients and signal noise.		 Remote data acquisition, intrinsic Safety, current to pressure and isolation which provides equipment & personal protection. T700 (loop isolator) 
T703 (wide ranging)
T280
IP51
Thermocouple
(Types B, C, E, J, K, N, R,S, T)
Includes encapsulated cold-junction compensation (CJC) and sensor burnout detection		 Remote temperature data acquisition, intrinsic safety and isolation which provdes equipment and personal protection. T723 (wide ranging) 
T280
T797/8 (programmable/Hart)
RTD 
(Type PT, NI110, CU10)
Includes DC excitation supply for 3-wire RTD resistance sensors and sensor burnout detection T797/8.		 Remote temperature data acquisition, BTU transfer rate, intrinsic safety and isolation which provides equipment and personal protection. T713 (wide ranging) 
T797/8 (programmable/Hart)
T280
T513
Potentiometer 
(50 ohm to 200K ohms)
Includes excitation supply for 3-wire potentiometer or slidewires, to minimize circuitry at the sensor.		 Remote tank level data acquisition, setpoint transmission, resistance position sensor conditioning and isolation which provides equipment and personal protection. T752 (wide ranging)
Frequency 
(0-50Hz to 0-10KHz)
Includes 50% or greater span "turndown" adjustability. accepts input amplitudes from 100mVpp to 20Vrms.		 Motor/pump speed, remote flow data acquisition, intrinsic safety and isolation which provides equipment and personal protection. T773 (wide ranging)
AC Voltage or Current 
(V, mV, A, mA,) 
Includes optimum filtering, and conditioning to reduce susceptibility to transient and noisy operation.		 Remote AC data acquisition, AC motor status control and isolation which provides equipment and personal protection. T761 (wide ranging)

Miniature, Thermal-Head Mounted, 1000VDC Input to Output Isolation

T280
Isolated, Universal 2-Wire Transmitter for Thermocouple, Pt-100 RTD & mV
  • Universal Input Capabilities Reduce the Required Inventory Levels. 
  • Eliminates Ground Loops with 1000VDC Input to Output Isolation.
  • Low Profile Enclosure Design for Easier Mounting and Wiring. 
  • Hinged Cover over Zero & Span Pots for Applications in Dirty Environments. 
  • Custom Embedded Terminals for Physical Rigidity and Reliability.
The model T280 is an isolated, 2-wire temperature and mV input transmitter designed to fit in a standard industrial thermal-head. The unit supports both Pt-100 RTD and thermocouple inputs as well as voltages up to 100mV. Thermocouples supported include B, E, J, K, L, N, R, S and T. If thermal-head mounting is not required, the T280 can be either mounted directly on a bulkhead or DIN rail with the included DIN rail clip.
There are three different series of models in the family. The –1xxx units are for Pt-100 RTD. The default from the factory is 3-wire, but the units can be easily reconfigured for 2-wire, as explained in the installation instructions. The –2xxx units are thermocouple input devices. And finally, the –3xxx units are set-up for millivolt input. 
The list of model numbers in the MODELS section is only a partial listing. If you do not see the model you need, contact Inotek sales by calling 1-800-492-6767.

Transmitters are used to amplify and condition the very small electrical signals which are generated by sensors as they measure the physical variables of a process. Once conditioned to usable levels, these signals are used to drive other instrumentation such as industrial computers, dataloggers, chart recorders, alarms, panel meters and controllers. 

Programmable, Isolating, Universal Input 2-Wire Transmitter

T287
Provides an Isolated, Linearized Current Loop in Proportion to a Thermocouple, RTD, Millivolt, Potentiometer or Resistance Input in a Miniature Package
  • Universal Input Capabilities Reduces the Required Inventory Levels
  • Eliminates Ground Loops with 2000VDC Input to Output Isolation
  • Supports Single or Dual Inputs
  • User-Friendly Configuration via Windows Based Software Provides Full Programmability for Sensor Type and Input Range
  • Custom Linearization Capabilities for Special T/C Types
  • DIN Rail Mounting Adapter Included
 T287 Transmitter

Buy It Now ! Ordering Info
The Model T287 is a programmable two-wire transmitter that is configured to provide an isolated 4-20mA signal in proportion to the desired input signal. The T287 accepts thermocouple, 2-, 3-, or 4-wire RTD, potentiometer, resistance and millivolt inputs. The T287 is capable of supporting either single or dual inputs. In the dual input mode, either input can be selected to control the output or math functions can be applied where both inputs have an effect on the output. The functions available are Sum, Difference, Average, Higher of the two or Lower of the two inputs. Typical applications include providing accurate, stable signals to distributed control systems (DCS), supervisory control and data acquisition systems (SCADA), environmental monitoring and control systems (EMCS), data acquisition and control systems (DACS) and custody transfer/pipeline systems. 
Configuration is performed by connecting the transmitter to a standard PC serial port, (9-pin RS-232) using an isolated interface adapter, and running a user-friendly, Windows-based program. Unique technology in the T287 allows all configuration information to be defined and modified with only a PC, the interface adapter, and the transmitter. No loop supply, input simulation or meter on the output is required. The fully isolated adapter reduces the risk of expensive damage to the PC which can be caused by spikes and surges on field wiring entering the computer via its unprotected serial port. 
The T287 utilizes state of the art microprocessor technology that yields higher accuracy and long-term stability with lower power consumption than prior generation transmitters. The T287 automatically performs frequent self-tests and auto-calibration while in service, resulting in very stable, long-term performance. The stability of the T287 is greater than 0.1% of span over 12 months.

Loop-Powered Isolator

T700
Provides an Isolated DC Current Output Equal to, and Powered by, an Input Current 
  • Protects Equipment and Personnel with 1800V Input-to-Output Isolation
  • 1:1 Input/Output Current Transfer Ratio from 1 to 20mA 
  • Input Loop-Powered Design Eliminates Output Power Supply 
  • 500 Ohm Output Drive, up to 10V Compliance 
  • Three Year Warranty



The T700-0001 is a loop-powered isolator. Accepting a current input (typically 4-20mA), the TransPak T700 takes its power source voltage and the output current loop drive (500W, 10V compliance Max.) from the input current loop. The 1-20mA output current follows the input current signal. Span adjustment is provided to adjust for load variations. There are two (+) output terminals. Terminal #3 is for load less than 100W (e.g. current meter inputs) and terminal #4 for loads greater than 100W.
The T700 is designed for installation in industrial field environments. Circuitry is enclosed in the TransPak’s rugged, die cast aluminum housing which is sealed for protection against corrosion, moisture dust and electrical noise such as radio frequency interference (RFI) and electromagnetic (EMI) interference. Top-mounted barrier terminals strip connections are provided. Optional mounting solutions and enclosures are provided. 

DC Input Isolating, Field Configurable Two-Wire Transmitter

T703
Provides an Isolated Current Loop in Proportion to a DC Current or Voltage Input 
  • Eliminates Ground Loops with 1000V Input-to-Output Isolation 
  • Field Configurable Input Ranges: 20mV to 200V, 1mA to 50mA 
  • Wide Ranging Zero and Span Adjustability 
  • Super Bright LED Provides Go/No-Go Loop Status 
  • RFI Filters Minimize Transmission Faults
  • FM and CSA Entity Safety Approval for Hazardous Installations
  • Three Year Warranty
 T703

Buy It Now ! Ordering Info
The T703 offers the user a choice of 16 overlapping input ranges which are field selectable via top-accessed DIP switches (see Table 1). The T703 isolating two-wire transmitter can accept input voltage spans from 20mV to 200 volts and input current spans from 1mA to 50mA. Bipolar selection modifies the unipolar range to include a negative offset (e.g. 200V becomes ±100V). The T703 provides 1000Vrms of transformer-coupled isolation and 120VAC continuous input overload protection. The top-mounted super bright LED illuminates when the loop current is above 3.3mA. Standard surface mount RFI filters reject walkie-talkie interference and noise. Current output is in proportion to the selected voltage or current input. 
A major advantage of the T703 is its truly wide-ranging capability. The T703 enables 80% zero “turn-up” and 80% span “turn-down” adjustments within any user-selected input range. For example, Range 11 of Table 1 specifies 0 to 100V with a minimum span of 20V (100V - 20V = 80V, or 80%). This 80% adjustability allows the user to field-calibrate the unit for the maximum (0 to 100V) down to any minimum (20V) span (e.g. 25V to 45V)--as long as that adjusted span remains within the selected 0 to 100V range. The same is true for any adjustable span, minimum or otherwise, in any user-selectable range: all spans are field adjustable from 20% (minimum span) to 100% of the specified range.

Current To Pressure Transducer

IP51 & IP61
Provides a Pneumatic Output Proportional to a Current Input
  • Intrinsically Safe or Explosion Proof 
  • Rugged Housings - NEMA 4X (IP51) or Explosion Proof (IP61)
  • Field Configurable Direct, Split and Inverse Ranges
  • Calibrate without Removing Tubing or Wires (with Optional Test Jack)
  • Accuracy better than 0.15% (345 psig) 
  • One Year Warranty
The IP51 and the IP61 current to pressure converters produce a pneumatic output in response to a current input. They are useful for applications involving the control of actuators, valves, or interfacing electrical equipment to pneumatic instrumentation. 
This series of I/P transducers represents a new generation in pneumatic signal conversion. The unique solid state current to pressure converter uses minimal electrical energy and air consumption to produce accurate, output pressure signals. Because there are no moving parts, the unit will operate reliably for many years when installed properly. They are designed for ease of installation and operation. 
These transducers are available in a NEMA 4X housing (IP51) or in an Explosion Proof housing (IP61). They are rated Intrinsically Safe and are available with FM approval (standard) and CSA approval (optional).

Thermocouple Input Isolating, Field Configurable

T723
Provides an Isolated Current Loop in Proportion to a Thermocouple Input 
  • Eliminates Ground Loops 
  • Easy Field Configurable Switch Selectable Input Ranges 
  • Integral Cold-Junction Compensation 
  • Wide Ranging Zero and Span Adjustability (80%) 
  • Protects Equipment with 600V Input to Output Isolation 
  • Three Year Warranty
 T723

Buy It Now ! Ordering Info
The T723 offers a choice of J/K/T or E/R/S input ranges and 2 output ranges, which are field selectable via top-accessed DIP switches (see Tables 1-2). The T723 provides 600 VDC input to output of isolation with outputs of either 4-20mA or 10-50mA. The current output is linear to the equivalent mV thermocouple signal and non-linear to temperature. This is useful in data acquisition systems that utilize linearizing software. Upscale burnout is standard. This provides a maximum output with an open thermocouple. 
A major advantage of the T723 is its wide ranging capability. The T723 enables 80% zero and span adjustability within any user selected input ranges shown in Table 1 and 2. For example, Range K1 of Table 1 specifies 0° to 500°C with a minimum span of 100°C (500°-100° = 400°, or 80%). This 80% adjustability factor allows the user to field calibrate the unit for the maximum (0 to 500°) down to any minimum (100°C) span (e.g. 14°C to 114°C)--as long as that adjusted span remains within the selected 0 to 500°C range. The same is true for any adjustable span, minimum or otherwise, in any user selectable range: all spans are field adjustable from 20% (minimum span) to 100% of the specified range.

Temperature Input, Smart, Isolating Two-wire Transmitter

T797 & T798
Provides an Isolated, Linearized Current Loop in Proportion to an RTD or Thermocouple Input
  • Highway Addressable Remote Transducer (HART) Compatible Protocol (T798) or Field Configurable with Optional Alpha-numeric Display (T797 & T798) 
  • Intrinsically Safe Operation (FM, CSA, CENELEC pending) or with Display and EP Enclosure
  • Programmable for 11 Thermocouple Types, 6 RTD Types, mV or Ohm Inputs 
  • Eliminates Ground Loops with 500VAC Input to Output Isolation
  • Minimal Calibration Requirements with Long Term Stability Better Than 0.025%/Year
  • Three Year Warranty
 T700 Series

Buy It Now !  Ordering Info
The model T798 is a smart, Highway Addressable Remote Transducer (HART) based, temperature transmitter that can be factory or field configured using an optional 1 or 2 line alpha-numeric display, optional PC based modem and software. Alternatively an HC275 Hand Held Communicator loaded with the Action T798 Device Description from the Hart Foundation Library can be used. 
The model T797 is a programmable temperature transmitter that can be factory or field configured using the same optional 1 or 2 line alphanumeric display as the T798. 
Both the T798 and T797 accept a wide variety of thermocouple (B, C, E, J, K, L, N, R, S, T, U & special) and 2, 3, or 4 wire Platinum RTDs (DIN µ = 0.00385, SAMA µ = 0.003923 and special) as well as millivolt (mV) and resistance inputs. They provide an isolated 4-20mA output loop that is proportional and linear to the desired temperature input range when configured appropriately. The factory can configure custom curves and accommodate other input types including 10 Ohm Copper and 120 Ohm Nickel RTDs.

RTD Input Isolating, Field Configurable Two-Wire Transmitter

T713
Provides an Isolated, Linearized Current Loop in Proportion to a 3-Wire RTD Input (100 ohm Pt)
  • Eliminates Ground Loops with 600V Input-to-Output Isolation
  • Easy Field Configurable, Switch Selectable Input Ranges
  • Wide Ranging Zero and Span Adjustability (80%) 
  • Integral RTD Linearization/Output Linear to Temperature
  • Three Year Warranty
The T713 series offers the user the choice of 6 widely adjustable input ranges and 2 output ranges, which are field selectable via top accessed DIP switches (see Tables 1 and 2). The T713 provides 600VDC of isolation with outputs of either 4-20mA or 10-50mA. Current outputs are linear to temperature. 
A major advantage of the T700 Series is their truly wide ranging capability. The T713 enables 80% zero and span adjustability within any user selected input range. For example, Range 1 of Table 1 specifies 0 to 1000° F with a minimum span of 200° F (1000° - 200° = 800°, or 80%). This 80% adjustability factor allows the user to field calibrate the unit for the maximum (0 to 1000°) down to any minimum (200°) span (e.g. 740° to 940°) — as long as that adjusted span remains within the selected 0 to 1000°F range. The same is true for any adjustable span, minimum or otherwise, in any user selectable range. All spans are field adjustable from 20% (minimum span) to 100% of the specified range. 
Urethane coating of internal circuitry for protection from corrosive atmospheres is included, standard.

Non-Isolated, 2-Wire Transmitter for Pt-100 RTD

T513
Miniature, Thermal-Head Mounted Unit
  • Supports Pt-100 RTD, the Most Popular RTD
  • Linear to Temperature
  • Low Profile Enclosure Design for Easier Mounting and Wiring
  • Hinged Cover over Zero & Span Pots for Applications in Dirty Environments
  • Custom Embedded Terminals for Physical Rigidity and Reliability
The model T513 is a non-isolated, 2-wire temperature transmitter. The small physical size of the T513 makes it ideal to fit in a standard industrial thermal-head enclosure. The unit supports 2- or 3-wire Pt-100 RTD units. If thermal-head mounting is not required, the T513 can be either mounted directly on a bulkhead or DIN rail with the included DIN rail clip. The Model T513 is an extremely cost effective unit where large numbers of RTD transmitters are required. 
The Model T513 can be ordered in a variety of different ranges in either Centigrade or Fahrenheit. If the need requires, the T513 can be re-configured by the end-user. Complete instructions are included in the installation manual, supplied with the unit.

Potentiometer Input, Isolating, Field Configurable Two-Wire Transmitter

T752
Provides an Isolated Current Loop in Proportion to a 3-Wire Potentiometer Input
  • Eliminates Ground Loops 
  • Accepts 0-50 to 0-200K W Potentiometers
  • Wide Ranging Zero and Span Adjustability (80%)
  • Protects Equipment with 600V Input-to- Output Isolation
  • Three Year Warranty
The T752 accepts potentiometer inputs from 0 to 50 Ohms to 0 to 200K Ohms (end to end). The T752 provides 600 VDC of isolation with outputs of either 4-20mA or 10-50mA which are field selectable via top accessed DIP switch. Current outputs are in proportion to the potentiometer input. A major advantage of the T700 Series is their truly wide ranging capability. The T752 enables 80% zero and span adjustability within the input range of the potentiometer. The difference between the maximum span (100% of potentiometer) and the minimum span (20% of potentiometer) provides the 80% adjustability factor. This allows the user to field calibrate the unit for a wide variety of input spans from the maximum (0-100%) down to any minimum (20%) span (e.g., 4% to 24%)--as long as the adjusted span remains within the input range of the potentiometer. 
Urethane coating of internal circuitry for protection from corrosive atmospheres is included, standard. 

Frequency Input Isolating, Field Configurable Two-Wire Transmitter

T773
Provides an Isolated Current Loop in Proportion to a Frequency Input 
  • Eliminates Ground Loops 
  • Digitally-Synthesized, Field Configurable, Switch Selectable Ranges (105Hz to 18kHz)
  • Wide Ranging Zero (30%) and Span (80%) Adjustability 
  • Direct Magnetic Pickup Input 
  • Velocity/Flow Applications 
  • Protects Equipment with 1000VRMS Isolation 
  • Three Year Warranty
The T773 offers the user a choice of 5 input ranges and 2 output ranges, which are field selectable via top-accessed DIP switches (see Table 1). The T773 isolating two-wire transmitter can accept square, triangle or pulse waveforms up to 18KHz with amplitudes from 10mVrms to 35V peak-to-peak. The T773 provides 1000Vrms of transformer-coupled isolation with outputs of either 4-20mA or 10-50mA. 
Current outputs are in proportion to a selected frequency input. A major advantage of the T773 is its truly wide-ranging capability. The T773 enables 30% zero “turn-up” and 80% span “turn-down” adjustments within any user-selected input range. For example, Range 3 of Table 1 specifies 0 to 2100Hz with a minimum span of 420Hz (2100Hz - 420Hz = 1680Hz, or 80%). This 80% adjustability factor allows the user to field calibrate the unit for the maximum range of 0 to 2100Hz down to the minimum range of 0 to 420Hz. The maximum obtainable offset is 30% of the calibrated span: a calibrated range of 0 of 1000 Hz can be offset by 300Hz (e.g., 300Hz to 1000Hz).

AC Input Isolating, Field Configurable Two-Wire Transmitter

T761
Provides an Isolated Current Loop in Proportion to an AC Input 
  • Eliminates Ground Loops
  • Easy Field Configurable Switch Selectable Input Ranges 
  • Wide Ranging Zero and Span Adjustability (80%) 
  • Protects Equipment with 600V Input-to- Output Isolation 
  • Three Year Warranty
The T761 offers the user a choice of 12 widely adjustable input ranges and 2 output ranges, which are field selectable via top-accessed DIP switches (see Table 1). The T761 provides 600 VDC of isolation with outputs of either 4-20mA or 10-50mA. Current outputs are in proportion to selected AC voltage or current input. 
Model T761 measures the average value of the AC input signal and is calibrated for sine wave signals over a frequency range of 20Hz to 3KHz. For other wave forms, the calibration may be different, but the T761 will remain linear for the same wave form. For example, if the unit is calibrated using a square wave, the calibration will be valid for all square wave inputs in that range. The maximum DC component of the input signal is 50% of the range (e.g., 75VDC is half of a 0-150VAC range). 
A major advantage of the T700 Series is their truly wide ranging capability. The T761 enables 80% zero and span adjustability within most user-selected input ranges. For example, Range 3 of Table 1 specifies 0 to 25V with a minimum span of 5V (25V-5V = 20V, or 80%). This 80% adjustability factor allows the user to field-calibrate the unit for the maximum (0 to 25V) down to any minimum (5V) span (e.g. 10V to 15V)--as long as that adjusted span remains within the selected 0 to 25V range.

The TransPak Series

TransPak series two-wire transmitters are compact , rugged units that receive signals and direct sensor inputs, and operate from power derived from the output signal loop. The TransPak series provides a complete line of direct interface and conditioning modules for use with temperature, pressure, flow, strain and other process parameters. TransPak transmitters also accept a wide range of other electrical DC and AC voltage and current inputs. 

Two-Wire Transmitters
Two-wire transmitters offer several major advantages over conventional four-wire types, which require two wires for the output signal and two more for the power supply, typically 120VAC. In applications where the process sensor may be located up to several thousand feet from the instrument being operated, two-wire transmitters are more advantageous because their current output signals do not attenuate or degrade over distance as do the voltage signals of typical four-wire conditioners. Additionally there can be significant savings in wiring cost since only two wires are needed for the power and signal when compared to the four-wire type.

Intrinsic Safety
Because two-wire transmitters are powered by low-level 4-20mA or 10-50mA output current signals, no additional power has to be supplied to the remote transmitting location. This eliminates an associated problem of having to provide and maintain long runs of expensive wiring, and adds the benefit of being able to comply with safety requirements restricting the use of high-voltage (120VAC) in hazardous locations. 

Due to their low energy consumption and storage, two-wire transmitters are the only types of transmitters considered for intrinsically safe applications. Many of Action's TransPaks are Canadian Standards Association (CSA) and CENELEC approved for intrinsically safe operation in hazardous - even explosive - environments when installed in accordance with the manufacturer's drawings. 

Input Selection
Eight types of inputs are available to suit your process needs. 
 

  • DC Voltage or Current 
  • Potentiometer 
  • Thermocouple 
  • AC Voltage or Current 
  • RTD 
  • Frequency 
  • Strain Gauge 
  • Pressure
Three Year Warranty
Each TransPak two-wire transmitter is backed by Action Instrument's exclusive three-year warranty.

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