670T Series

Key Features:

These units receive 4-20mA process current inputs and provide isolated 4-20mA output signals .
Each channel operates independently and is isolated from the others to prevent interaction between channels .

• Multiple channels on a single unit space and reduces costs .
• Galvanicc isolation eliminates ground loops, reduces noise, and blocks transient signals .
• Independent channels prevent signal interaction and offer spares for later use .
• Fault LEDs provide a clear visual warning of open or failed process loops .
• Single calibration pot per channel enables one-step, precise calibration .

Product Details

– 4 to 20mA input (each channel) .
Input burden
– The voltage drop is a function of the input current and load resistance and is calculated as follows:
Input Voltage
– Drop = 4 .9V DC + (0 .0212A x Rload) For Rload = 250 ohms, Vdrop = 10 .2V DC
– 4-20mA DC output (each channel) .
Output load
– 0 to 525 ohms .
– Better than ±0 .1% of output span .Error includes the combined effects of isolator repeatability, hysteresis, terminal point linearity and adjustment resolution .
– One 15-turn potentiometer per channel accessible from front of the unit .
Ambient temperature effect
– Less than ±0 .01% of output span per °F (±0 .018% per °C) over the ambient temperature range for reference test conditions .This specification includes the combined effects of zero and span over temperature .
Output ripple
– Less than ±0 .1% of the maximum output span .
– -3dB at 2 .2Hz, typical .
Response time
– For a step input, the output reaches 98% of output span in less than 300mS, typical, into 250 ohms .
Noise rejection
– Common mode: 110dB at 60Hz, typical .
– LED fault indicator: Lights for output open loop detection or load compliance problem .
– Field test points: An internal 10 ohm sense resistor provides test points for monitoring the output signal
current during field maintenance with a voltmeter .


Ambient Temperature
– Operating: -25 to 70°C (-13 to 158F) .
– Storage: -40 to 85°C (-40 to 185°F) .
Relative Humidity
– 5 to 95% .
Power Requirement
– Power is derived from the input signal loop .
– In the event of an open output circuit, the input loop voltage drop is limited below 20V, nominal .Isolator has reverse polarity protection .
– Inputs, outputs, and individual channels are  isolated from each other for common-mode  voltages up to 250V AC, or 354V DC off ground, on  a continuous basis (will withstand 1500V AC dielectric  strength test for one minute without breakdown) .
Radiated Field Immunity (RFI)
– Designed to comply with EN61000-4-3 Level 3 (10V/m, 80 to 1000MHz AM and 900MHz keyed)
and European Norm EN50082-1 .
Electromagnetic Field Immunity (EMI)
– Less than ±0 .25% of output span effect under the influence of electromagnetic fields from switching
solenoids, commutator motors, and drill motors .
Electrical Fast Transient (EFT)
-Complies with EN61000-4-4 Level 3 (2KV) and European Norm EN50082-1 .
Surge Immunity
- Complies with EN61000-4-5 Level 3 (2KV) and European Norm EN50082-1 .
Electrostatic Discharge (ESD)
– Complies with EN61000-4-2 Level 3 (8KV air, 4KV direct to the enclosure port) and European Norm
EN50082-1 .
Radiated Emissions
– Meets or exceeds European Norm EN50081-1 for Class B equipment .
– CE marked, UL & cUL listed .
– Hazardous Locations: Class I: Div .2; Groups A, B, C, D .