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Model DT335-0700, 2/3/4-Wire RTD Input Transmitter 
 
USB Programmable, DIN Rail Mount, DC-Powered 
Dual/Single Transmitter or Signal Splitter w/ 
2/3/4-Wire RTD or Resistance Inputs and 
Sourcing Current or Voltage Outputs 

 

USER’S MANUAL 

 

 

 

ACROMAG INCORPORATED 

Tel: (248) 295-0880 

30765 South Wixom Road 

email: [email protected] 

Wixom, MI 48393-2417 U.S.A. 

 
Copyright 2018, Acromag, Inc., Printed in the USA. 
Data and specifications are subject to change without notice. 

8501135D

 

 

 

Summary of Contents for DT335-0700

Page 1: ... Splitter w 2 3 4 Wire RTD or Resistance Inputs and Sourcing Current or Voltage Outputs USER S MANUAL ACROMAG INCORPORATED Tel 248 295 0880 30765 South Wixom Road email sales acromag com Wixom MI 48393 2417 U S A Copyright 2018 Acromag Inc Printed in the USA Data and specifications are subject to change without notice 8501135D ...

Page 2: ...Power Connections 11 Earth Ground Connections 12 USB Connections 13 CONFIGURATION SOFTWARE 14 Quick Overview Android 14 Quick Overview Windows 15 TECHNICAL REFERENCE 18 OPERATION STEP BY STEP 18 Connections 18 Configuration 19 Calibration Optional 22 Diagnostics 24 RTD Resistance versus Temperature 25 BLOCK DIAGRAM 26 How It Works 26 TROUBLESHOOTING 27 Diagnostics Table 27 Service Repair Assistanc...

Page 3: ...anual may change without notice Acromag makes no warranty of any kind regarding this material including but not limited to the implied warranties of merchantability and fitness for its intended purpose Further Acromag assumes no responsibility for any errors that may appear in this manual and makes no commitment to update or keep current the information contained in this manual No part of this man...

Page 4: ...Nickel type RTDs supported 25Ω 450Ω 2250Ω and 4500Ω resistive ranges also supported Connects to two wire three wire or four wire RTD sensors Four wire sensor wiring eliminates error associated with lead wire resistance while three wire sensor wiring compensates for lead wire resistance Supports Celsius Fahrenheit and Kelvin temperature units Separate short circuit protected voltage and current out...

Page 5: ...ving a unit from the DIN rail A spring loaded DIN clip is located on the input side bottom The opposite rounded edge at the bottom of the output side allows you to tilt the unit upward to lift it from the rail while prying the spring clip back with a screwdriver To attach the module to T type DIN rail angle the top of the unit towards the rail and place the top groove of the module over the upper ...

Page 6: ...nnel input wiring may be shielded or unshielded type 14 30 AWG Ideally output wires should be twisted pair or shielded twisted pair Use insulated wire to keep channels isolated Terminals are pluggable and can be removed from their sockets by prying outward from the top with a flat head screwdriver blade The DT335 models allows RTD sensors to be wired to TB1 or TB3 Strip back wire insulation 0 25 i...

Page 7: ...t connections require two wired jumpers to be placed between input and input H and between input and input L The second jumper routes the excitation return current from input to the A D reference resistance at the input L terminal to accomplish ratio metric conversion of the sensor signal Ratio metric refers to measuring sensor resistance as a ratio of the reference resistance used to drive the A ...

Page 8: ...Model DT335 0700 Dual RTD Resistance Input Transmitter w USB Acromag Inc Tel 248 295 0880 8 http www acromag com 8 https www acromag com ...

Page 9: ... that twisted pair wiring is often used to connect the longest distance between each field output and its remote load as shown above shielded twisted pair wiring is recommended for best results An output connection to earth ground at each return will help protect the isolated output circuit from damage in noisy environments WARNING For compliance to applicable safety and performance standards the ...

Page 10: ...g 1005 220 or 1005 221 This optional power connection method can allow several dual channel modules to share a single power supply connection without wiring power to each unit s power terminals Power connections are isolated from each input and each output The supply voltage should be from 6 32V DC This voltage must never exceed 36V DC peak or damage to the unit may result Variations in power supp...

Page 11: ...220 or 1005 221 depending on left side or right side wire entry Any power input via the bus connector is diode coupled to the same point in the circuit as unit power connected at its power terminal TB5 You could power multiple units by snapping them together along the DIN rail bus using connector 1005 063 then connecting a mating terminal block select a left side or right side connector see figure...

Page 12: ...uired for the enclosure housing and you should connect that metal enclosure s ground terminal green screw to earth ground using suitable wire per applicable codes See the Electrical Connections Drawings for Input Output and Power and note the position of earth ground for each isolated entity Ground connections shown are recommended for best results and help protect the unit and its isolated circui...

Page 13: ...ation is recommended and required when connected to a grounded input Input 1 and USB connections are isolated from each output and power of this model USB Isolation is recommended for safety and noise suppression and is required when the input 1 sensor signal happens to be earth grounded You may use Acromag model USB ISOLATOR to isolate your USB port or you can optionally use another USB signal is...

Page 14: ...sired model Swipe left or right to view more diagrams No connection is required to view the diagrams Android requires user permission to access external hardware If the Device List displays No Device Permission select this device and when prompted to give permission to access the USB device tap OK Configuration Tab CONFIGURE I O Once connected the app will automatically read your transmitter and d...

Page 15: ... Communication Set up Configuration Calibration and Diagnostics A short description of each of these configuration pages follows Communication Set up First Connect to Unit Here Select from connected transmitters and Open Close communication with them Display Model Serial and Manufacturer of the connected transmitter and report the status of communication with it Configuration Configure the Unit He...

Page 16: ...onfiguration page as required before calibrating the input and be sure to click the Send I O Config button Click Input Cal Instructions to begin input calibration Next when you click input Zero or Full Scale you will be prompted to apply a specific input level at TB1 CH1 or TB3 CH2 depending on your selected input range Once you have applied this signal to the correct input click OK of the prompt ...

Page 17: ...nnels and validate operation Click Stop Polling to stop polling the input channels The simulated red lamp to the left of the button flashes slowly when the software polls the input channels Stop polling before selecting another page or sending a new reconfiguration After making Configuration changes you may use the Diagnostics TEST I O controls to start stop polling the input channel s to check yo...

Page 18: ...ent or voltage accurately to calibrate the output You could connect a current meter in series with a load to read the output current directly or a digital volt meter in parallel with a load to measure output voltage Alternatively you could simply connect a voltmeter across a precision load resistor to accurately read output current as a function of the IR voltage drop produced in the load resistor...

Page 19: ...en to be connected to more than one unit via a USB hub you can use the Device scroll field to the right of the Device field to select another unit of the same model using the serial suffix of the Device model to discern one unit from another Once you have selected a device click the Open button to open communication with the unit After clicking Open of the Connection screen with USB connected the ...

Page 20: ...nit as a single CH2 transmitter instead of CH1 select Dual transmitter mode and ignore CH1 Select the Input Type The third screen at left shows the Input Type selection If you select a RTD type the output will be linear with respect to the sensor temperature If you select Resistance the output will be linear with respect to the input resistance not temperature and no special linearization will be ...

Page 21: ...ad wire resistance will be compensated for the and L leads must be the same length diameter and material Select Two wire and sensor lead wire resistance will not be compensated for the lead wires will contribute a positive shift in the sensor resistance Select the Break Direction Select Downscale to drive the transmitter output to its under range limit or Upscale to drive the output to its over ra...

Page 22: ...al Instructions button to begin the process and then follow the on screen prompts to continue CALIBRATION Each Input Separately or In Sequence Before attempting input calibration set the nominal Input Range and input filter on the Configuration page and make sure you write your selection to the unit by clicking Send I O Config For the DT335 wire an input RTD or resistance source high precision dec...

Page 23: ...ise nominal output zero i e 0mA 4 000mA 10V 5V or 0V depending on the nominal output range setting as indicated by your output meter Measure this output level very accurately or output performance will be degraded At the precise output range zero click Output Zero of Calibration Output to calibrate the output zero Use the Output Course and Fine Adjustment controls to drive the output to its precis...

Page 24: ... operation by polling the input channels and checking their values Click Start Polling to trigger the software to periodically read the input channels and display their values in the fields below the polling button Note the simulated lamp next to the polling button flashes slowly each time it samples the inputs Click Stop Polling to stop polling the inputs before moving onto another tab page In th...

Page 25: ...135 160 135 249 135 333 191 64 12 511 100 138 506 139 007 139 107 139 200 200 64 12 897 150 157 325 158 066 158 222 158 360 248 95 14 828 200 175 856 176 828 177 044 177 226 303 46 16 776 250 194 098 195 294 195 574 195 799 366 53 18 725 300 212 052 213 463 213 811 214 079 439 44 350 229 716 231 336 231 756 232 065 400 247 092 248 912 249 409 249 758 450 264 179 266 192 266 769 267 157 500 280 978...

Page 26: ...long digitally isolated SPI busses Each 16 bit output DAC drives separate voltage and current terminals with a shared output return Output ranges are user configured scaled Power for the input and output circuits is provided via an isolated fly back converter operating on voltage wired to the power terminals at TB5 or wired to optional bus power terminals along the DIN rail Setup involves selectin...

Page 27: ...vices are also available from Acromag POSSIBLE CAUSE POSSIBLE FIX Cannot Communicate with Unit via USB Output shifts off range when you connect USB Output Erratic Not operational or at Wrong Value Unit fails to operate or exhibits an output shift A missing USB Isolator could cause a ground loop between a grounded input 1 sensor and earth ground at the connected Personal Computer s USB port because...

Page 28: ...g is incorrect or a sensor lead has broken It can also occur due to contention between earth ground at the PC USB port and the input sensor Check and adjust the input signal as required to drive output within its linear operating range A fully up down scale output can be driven by a sensor fault such as an open broken lead Check input 1 sensor wiring and if not isolating USB check for a ground loo...

Page 29: ...rface Package Software Interface Package Configuration Kit Order TTC SIP USB Signal Isolator USB A B Cable 4001 112 USB A mini B Cable 4001 113 Configuration Software CDROM 5040 TBD This kit contains all the essential elements for configuring DT family Transmitters Isolation is recommended for USB port connections to these transmitters and will block a potential ground loop between your PC and a g...

Page 30: ...e following terminals DIN Rail Bus Connector 1005 063 for 17 5mm TT SP DT Modules Left Side terminal block female connector 1005 220 Right Side terminal block male connector 1005 221 Two End Stops for 35 mm DIN Rails 1027 222 not shown Series SP Splitters and DT transmitters are shipped with their bus port plugged Remove this plug and insert DIN Rail Bus Connector 1005 063 shown at left which allo...

Page 31: ...ll require use of the TTC SIP configuration kit ordered separately see Accessories section Inputs Each This model has dual isolated inputs at TB1 and TB3 intended for RTD or resistance sensor connections This unit has three different operating modes dual transmitter single transmitter and CH1 signal splitter Input Reference Test Conditions each 100Ω Pt RTD α 0 00385 200 C to 850 C input configurat...

Page 32: ...vior not the input reading the input reading always goes down scale for an RTD lead break Input Analog to Digital Converter A D Each channel uses a 24 bit A D converter with only the first 16 bits used Its signal is normalized to a bipolar range count of 25000 to simplify I O scaling see Resolution below Sampling Rate A D Inputs sampled at a variable rate with filter as follows A D SAMPLING RATE S...

Page 33: ...ce Input Zero and Full Scale selections must be within the nominal range and will be mapped to zero 0 and full scale 100 at the output Keep in mind that the input resolution diminishes below nominal as a programmed range is reduced Likewise error is magnified as input span is reduced Outputs Each Unit outputs are short circuit protected from damage Output Range Each channel has separate voltage an...

Page 34: ... the input set to No filter Low filter Medium filter and High filter INPUT FILTER TYPICAL OUT RESPONSE TIME TO 98 OF TRANSITION NONE 25ms LOW 44ms MEDIUM 146ms HIGH 1068ms Output Load The voltage outputs can drive loads down to 1KΩ minimum The current outputs can drive 21mA DC into 0 525Ω USB Interface The USB interface includes a USB MINI B socket for temporary connection to a PC or laptop for se...

Page 35: ...aptop does not normally connect to earth ground Power Unit power connections are reverse polarity protected CAUTION Do not exceed 36VDCpk to avoid damaging the unit Terminal voltage at or above 6V minimum must be maintained across the unit during operation Power Supply Connect at TB5 or via DIN Rail Bus Terminal 6 32V DC SELV Safety Extra Low Voltage 1 6W maximum Observe proper polarity reverse vo...

Page 36: ...r Safety for Process Control Equipment for the voltage rating specified Operating Shock Vibration Immunity Designed to comply with IEC 60068 2 6 10 500Hz 4G 2 hours axis for random vibration and IEC 60068 2 27 25G 11ms half sine 18 shocks at 6 orientations for mechanical shock Installation Category Suitable for installation in a Pollution Degree 2 environment with an Installation Category Over vol...

Page 37: ...proportional to input signals taken from differential voltage measurements across resistance input sensors RTD or resistances wired to TB1 CH1 or TB3 CH2 No switches or potentiometers are used to adjust this transmitter Its behavior as a dual isolated signal amplifier transducer is determined via programmed variables set using a temporary USB connection to a host computer or laptop running a Windo...

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