Analog DC to DC Signal Conditioners, Converters,  Isolators, Transmitters

• Lifetime Warranty on API Modules
• LoopTracker ^® LEDs
• Hot-Swappable Plug-In Design
• Zero and Span Output Calibration
• Push to Test Output
• Full I/O/Power Isolation

Click on PDF links below
for product information

Literature and Links

API product brochure
Options & accessories
Cross reference
Regulatory Compliance page

UL Approvals

API modules USA
API modules Canada

APD modules USA
APD modules Canada

Reference Info
Ground Loops
RFI / EMI
LoopTracker and Output Test
Sink vs Source

Applications

Monitoring motor speed with a PLC
Building heat SCR control
Manual override of computer control
Monitor pressure with a PLC
Control & monitor with one flow meter
Monitor product moved by conveyor
Pharmaceutical process validation
Dam bubbler
SCR drive voltage
Blower speed
DC motor voltage and current
DC motor current
Bindicator level xmtr to PLC
Special API4300 for engine speed
Contol conveyor material
Sewage pumping stations
Hydraulic fracking control
Anemometer interface to PLC
Special API4300 for engine speed

How to Order

1. Select a model
2. See data sheet for ordering info and options
3. Note that options affect pricing
4. Request a quote via chat or call us
5. 2-5 day typical lead time + shipping time
6. 5-10 day lead time for quantities of 5 or more + shipping time
7. To place your order

• Call 800-942-0315 for credit card order
• Find your authorized representative
• Call us to find your local distributor
• Set up an account to use a purchase order
• Outside the USA?

DC to DC Isolated Signal Conditioners

Factory Configured

API 4300 G  from $299

Open Datasheet
Download Datasheet

API 4300 G
Specify input range
Factory configured
0-100 mVDC to 0-500 VDC
±100 mVDC to ±10 VDC
0-100 μADC to 0-900 mADC
Specify output range
Factory configured
0-1 V to 0-10 V
±1 V to ±10 V
0-1 mA to 0-20 mA, 4-20 mA

• Hot-swappable plug-in design
• Replaces Action AP 4300
• I/O LoopTracker LEDs
• Output test button
• Full I/O/power isolation
• 18 V loop power supply
• Uses API-008 8-pin socket
• 115 VAC powered
• A230 option for 230 VAC
• P option for 85-265 VAC, 60-300 VDC power
• D option for 9-30 VDC

Low Range DC to DC Isolated Signal Conditioners

Factory Configured

API 4310 G  from $329

Open Datasheet
Download Datasheet

API 4310 G Narrow/Low Input
Specify input range
Factory configured
0-10 mV to 0-100 mV
±10 mV to ±100 mV
0-100 μA to 0-1 mA
Specify output range
Factory configured
0-1 V to 0-10 V
±1 V to ±10 V
0-1 mA to 0-20 mA, 4-20 mA
I/O reversal available

• Hot-swappable plug-in design
• Replaces Action AP 4310
• I/O LoopTracker LEDs
• Output test button
• Full I/O/power isolation
• 18 V loop power supply
• Uses API-008 8-pin socket
• 115 VAC powered
• A230 option for 230 VAC
• P option for 85-265 VAC, 60-300 VDC power
• D option for 9-30 VDC

DC to DC Isolated Signal Conditioner

Factory Configured

APD 4300  from $309

Open Datasheet
Download Datasheet

APD 4300
Specify input range
0-100 mVDC to 0-300 VDC
±100 mVDC to ±10 VDC
0-1 mADC to 0-1000 mADC, 4-20 mA
Specify output range
Factory configured
0-1 V to 0-20 V
±1 V to ±10 V
0-1 mA to 0-20 mA, 4-20 mA
I/O reversal available
APD 4300 PLC
Input range: 4-20 mA
Output range: 4-20 mA

• Removable plugs
• I/O LoopTracker LEDs
• Output test button
• Output test terminals for manual override capability
• Full I/O/power isolation
• Selectable I/O sink/source
• 15 V input loop power supply
• 20 V output loop power supply
• Universal power 85-265 VAC, 60-300 VDC
• D option for 9-30 VDC, 10-32 VAC power

• Correct sink-sink or source-source mismatches
• Isolate single-ended inputs
• Eliminate PLC/DCS ground loops
• Use with Allen Bradley, GE/Fanuc, IDEC,
  Omron, Mitsubishi, Modicon, Siemens,
  Panasonic, Honeywell analog inputs

DC to DC Isolated Signal Conditioner

Field Selectable Minuteman Setup

API 4380 G  from $299

Open Datasheet
Download Datasheet

24 Field configurable inputs
0-50 mV to 0-10 V
±5 V, ±10 V
0-1 mA to 0-20 mA, 4-20 mA
16 Field configurable outputs
0-1 V to 0-10 VDC
±5 V to ±10 V
0-2 mA to 0-20 mA, 4-20 mA

• Minuteman one-minute setup
• Hot-swappable plug-in design
• Replaces Action AP4380, Wilkerson MM4380
• I/O LoopTracker LEDs
• Output test button
• Full I/O/power isolation
• 18 V loop power supply
• Uses API-008 8-pin socket
• 115 VAC powered
• A230 option for 230 VAC
• P option for 85-265 VAC, 60-300 VDC power
• D option for 9-30 VDC power

DC to DC Isolated Signal Conditioner

Field Selectable Minuteman Setup

APD 4380  from $309

Open Datasheet
Download Datasheet

53 field configurable input ranges
0-10 mVDC to 0-130 VDC
±5 mV to ±65 VDC
0-200 μA to 0-50 mADC
18 Field configurable output ranges
0-1 V to 0-10 VDC
±5 V to ±10 V
0-2 mA to 0-20 mA, 4-20 mA

• Minuteman one-minute setup
• Removable plugs
• I/O LoopTracker LEDs
• Output test button
• Full I/O/power isolation
• Selectable I/O sink/source
• 15 V input loop power supply
• 20 V output loop power supply
• Universal power 85-265 VAC, 60-300 VDC
• D option for 9-30 VDC, 10-32 VAC power

High Accuracy DC to DC Isolated Signal Conditioner

Field Programmable

APD 4381  from $395

Open Datasheet
Download Datasheet

54 field configurable input ranges
0-50 mVDC to 0-10 VDC
±25 mV to ±10 VDC
0-500 μA to 0-20 mADC
Custom input range available
18 field configurable output ranges
0-1 V to 0-10 VDC
±5 V to ±10 V
0-2 mA to 0-20 mA, 4-20 mA

• Covers all common DC sensors
• Removable plugs
• I/O LoopTracker LEDs
• Output test button
• Full I/O/power isolation
• Selectable I/O sink/source
• 15 V input loop power supply
• 20 V output loop power supply
• Universal power 85-265 VAC, 60-300 VDC
• D option for 9-30 VDC, 10-32 VAC power
• For orders of 5 or more, call us for lead times

DC to DC Isolated Signal Conditoner

Field Selectable Minuteman Setup

API 4385 G  from $329

Open Datasheet
Download Datasheet

24 field configurable inputs
-50-0 mVDC to 0-20 VDC, 20-40 VDC
0-200 μADC to 0-40 mADC, 10-50 mADC
Selectable zero offset
16 field configurable outputs
0-1 V to 0-10 V
±5 V, ±10 V
0-2 mA to 0-20 mA, 4-20 mA

• Minuteman one-minute setup
• Hot-swappable plug-in design
• I/O LoopTracker LEDs
• Output test button
• Full I/O/power isolation
• 18 V loop power supply
• Uses API-008 8-pin socket
• 115 VAC powered
• A230 option for 230 VAC
• P option for 85-265 VAC, 60-300 VDC power
• D option for 9-30 VDC power

DC to DC Isolated Signal Conditoner
High Voltage DC Input

Field Selectable Minuteman Setup

API 4380 GHV3  from $379

Open Datasheet
Download Datasheet

24 field configurable inputs
0-1 VDC to ±200 VDC
16 field configurable outputs
0-1 V to 0-10 V
±1 V to ±10 V
0-2 mA to 0-20 mA, 4-20 mA

• Minuteman one-minute setup
• Hot-swappable plug-in design
• I/O LoopTracker LEDs
• Output test button
• Full I/O/power isolation
• Uses API-008 8-Pin Socket
• 115 VAC powered
• A230 option for 230 VAC
• P option for 85-265 VAC, 60-300 VDC power
• D option for 9-30 VDC power

DC to DC Isolated Signal Conditoner
High Voltage DC Input

Field Selectable Minuteman Setup

APD HV-DC   from $395

Open Datasheet
Download Datasheet

8 selectable input ranges
7 standard plus 1 factory set
0-100 VDC to 0-1200 VDC, and custom
specify custom range if required (2000 VDC max.)
18 selectable output ranges
0-1 V to 0-10 V,
±5 V, ±10 V,
0-2 mA to 0-20 mA, 4-20 mA,

• I/O LoopTracker LEDs
• Output test button
• Full I/O/power isolation
• DIN rail mount
• 22.5 mm wide
• Universal power 85-265 VAC, 60-300 VDC
• D option for 9-30 VDC, 10-32 VAC power

IsoSplitter® Signal Splitter
1 DC Input to 2 DC Outputs

Factory Configured

APD 4930  from $309

Open Datasheet
Download Datasheet
Open Features
Download Features

Specify input range
0-10 mVDC to 100 VDC
±50 mV to ±10 VDC
0-1 mADC to 0-50 mADC, 4-20 mADC
Specify output range for each channel
2 independent channels
0-1 V to 0-20 V
±1 V to ±10 V
0-1 mA to 0-25 mA, 4-20 mA

• Removable plugs
• Output LoopTracker LEDs
• Selectable sink/source mA input
• 15 V input loop power supplies
• Sourcing mA output (sinking optional)
• 20 V output loop power supplies
• Sinking mA outputs optional
• Output test/manual override terminals
• Full I/O/power isolation
• DIN rail mount
• 22.5 mm wide
• Universal power 85-265 VAC, 60-300 VDC
• D option for 9-30 VAC/VDC power

IsoSplitter® Signal Splitter
1 DC Input to 2 DC Outputs

Factory Configured

APD 4393  from $475

Open Datasheet
Download Datasheet

Specify input range
Factory Configured
0-10 mVDC to 100 VDC
±50 mV to ±10 VDC
0-1 mADC to 0-50 mADC, 4-20 mADC
Specify output range for each channel
2 independent channels
0-1 V to 0-20 V
±1 V to ±10 V
0-1 mA to 0-25 mA, 4-20 mA

• Removable plugs
• I/O LoopTracker LEDs
• Selectable sink/source mA input
• 15 V input loop power supplies
• Selectable sink/source mA output
• 20 V output loop power supplies
• Output test button
• Full I/O/power isolation
• DIN rail mount
• 45 mm wide
• Universal power 85-265 VAC, 60-300 VDC
• D option for 9-30 VAC/VDC power

Universal Input to DC Isolated Signal Conditioner

Field Programmable

APD 8000  from $399

Open Feature Summary
Download Feature Summary
Open Datasheet
Download Datasheet

Field configurable inputs
DC volts: 35 ranges from ±25mVDC to ±10 VDC
DC mA sinking input, 20 ranges from ±0.5mADC to ±20mADC
Potentiometer: 100Ω min. to 1 MegaΩ max.
Thermocouple: J, K, T, E, R, S, N, B, C, D, G, M, P
RTDs: 2, 3, or 4 wire, 10Ω to 8000Ω RTDs
Thermistor: 44000 series, YSI 400, Spectrum
Custom input available
18 field programmable output ranges
Voltage: 0-1V, 0-2V, 0-4V, 0-5V, 1-5V, 0-8V, 0-10V, 2-10V,
±5V, ±10V
Current: 0-2mA, 0-4mA, 0-8mA, 0-10mA, 2-10mA, 0-16mA,
0-20mA, 4-20mA
Can be wired for sink or source

• Switch and pushbutton setup
• Removable plugs
• Input LoopTracker LED
• Output test button
• Full I/O/power isolation
• Selectable output sink/source
• 20 V output loop power supply
• Universal power 85-265 VAC, 60-300 VDC
• D option for 9-30 VDC, 10-32 VAC power
• For orders of 5 or more, call us for lead times

DC to DC Isolated Signal Conditioner

Field Configurable

K109UI  $169 *more coming*

Open Datasheet
Download Datasheet
Open Installation Manual
Download Installation Manual
Click to see ALL Seneca products

Field Configurable Input
Input: 0-20 mA, 4-20 mA,
0-5 VDC, 1-5 VDC, 0-10 VDC, 2-10 VDC,
0-15 VDC, 0-30 VDC
Field Configurable Output
Output: 4-20 mA, 0-20 mA, 20-4 mA, 20-0 mA,
0-5 V, 1-5 V, 0-10 V, 10-0 V

• Only 6.2 mm wide
• DIP switch configuration
• Full 3-way isolation
• Low cost
• DIN rail mount without tools
• Power: 19.2-30 VDC or K-SUPPLY+KBUS

DC to DC Isolated Transmitter
with Sink/Source Input

Field Configurable

K109S  $169 *in stock*

Open Datasheet
Download Datasheet
Open Installation Manual
Download Installation Manual
Click to see ALL Seneca products

Field Configurable Input
Input: 4-20 mA, 0-20 mA, 20-4 mA, 20-0 mA,
0-5 V, 1-5 V, 0-10 V, 10-0 V
Field Configurable Output
Output: 4-20 mA, 0-20 mA, 20-4 mA, 20-0 mA,
0-5 V, 1-5 V, 0-10 V, 10-0 V

• Only 6.2 mm wide
• DIP switch configuration
• Full 3-way isolation
• Low cost
• DIN rail mount without tools
• Power: 19.2-30 VDC or K-SUPPLY+KBUS

Universal Input to 4-20 mA Loop Powered Transmitter

Field Programmable

K121  $149 *1 in stock*

Open Datasheet
Download Datasheet
Open Installation Manual
Download Installation Manual
Click to see ALL Seneca products

Field Programmable Input
Input: –150 mV to +150 mV
–30 V to +30V
–24 mA to 24 mA
RTD: Pt100, Pt500, Pt1000, Ni100
Thermocouple: J, K, T, E, R, S, B, N
Potentiometer: 500 Ω to 10 KΩ
Resistance: 1750 Ω
Output: 4-20 mA loop powered
Powered by the output loop

• Only 6.2 mm wide
• PC programmable configuration
• Full 2-way isolation
• Low cost
• DIN rail mount without tools
• Powered by 4-20 mA loop

DuoPak ^® 2 Channel Isolated Signal Conditioners

Factory Configured

APD 2000 Series  from $519

Specify input range for each channel
APD 2000 Ch1: DC mV/V/mA Ch2: DC mV/V/mA
APD 2001 Ch1: DC mV/V/mA Ch2: RTD
APD 2003 Ch1: DC mV/V/mA Ch2: Potentiometer
APD 2005 Ch1: DC mV/V/mA Ch2: Strain gauge
APD 2006 Ch1: DC mV/V/mA Ch2: AC mV, V, mA
APD 2007 Ch1: DC mV/V/mA Ch2: Frequency
Specify output range for each channel
2 independent channels
0-1 V to 0-20 V
±1 V to ±10 V
0-1 mA to 0-25 mA, 4-20 mA

• Optional I/O reversal
• I/O LoopTracker LEDs
• Selectable sink/source mA output
• 20 V output loop power supplies
• Output test buttons
• Full I/O/power isolation
• Removable plugs
• DIN rail mount
• 45 mm wide
• Universal power 85-265 VAC, 60-300 VDC
• D for 9-30 VDC, 10-32 VAC power

DC to DC Signal Conditioners
Math Functions

Factory Configured

API 4400 G - API 4408 G  from $329

Open Datasheet
Download Datasheet
API 4400 G: (A+B+C+D)/4
API 4401 G: (A+B+C)/3
API 4402 G: (A+B)/2
API 4403 G: (A+B+C–D)/3
API 4404 G: (A+B–C–D)/2>
API 4405 G:  A–B–C–D
API 4406 G: (A+B–C)/2
API 4407 G:  A–B–C
API 4408 G:  A–B

Specify input ranges
Factory configured
Input negative is common
0-100 mV to 0-10 V
±100 mV to ±10 V
0-1 mA to 0-20 mA, 4-20 mA
Specify output range
Factory configured
0-1 V to ±10 V
0-2 mA to 0-20 mA, 4-20 mA

• Hot-swappable plug-in design
• Direct replacements for Action AP 4400 series
• I/O LoopTracker LEDs
• Output test button
• Full I/O/power isolation
• Uses API-011 11-pin socket
• 115 VAC powered
• A230 option for 230 VAC
• P option for 85-265 VAC, 60-300 VDC power
• D option for 9-30 VDC power

Head-Mount Universal Transmitter, Isolated

Field Programmable

Fits DIN Form B Heads

T121  $159 *in stock*

Open Datasheet
Download Datasheet
Open Installation Manual
Download Installation Manual
Click to see ALL Seneca products

Programmable
Input: Pt100 or Ni100, Pt500, Pt1000
J, K, R, S, T, B, E, N
Potentiometer
mVDC, VDC
Selectable Output
Output: 4-20 mA, 20-4 mA

• Order T121-C for pre-programmed I/O
• 44 mm dia
• EASY-USB configuration
• I/O isolation
• Low cost
• DIN B with 5.8mm (0.228"dia) center hole
• Power: 7 to 30 VDC current loop

USB - UART TTL Converter

EASY-USB  $109

Open Datasheet
Download Datasheet
Open Installation Manual
Download Installation Manual
EASY-USB Software Link

Programming kitK121
K121

Includes
Converter
Software mini CD (or download latest)
Adapter cable (std USB cable not included)

4 Digit 4-20 mA Loop Powered Display

Field Rangeable

S315  $139 *in stock*
S315-IP66  $300

Open Datasheet
Download Datasheet
Open Installation Manual
Download Installation Manual
Click to see ALL Seneca products

Loop Powered Display
Input: 4-20 mA
Display: 4 digit red LED

• 1/8 DIN panel mount or IP66 housing
• Scaleable 4 digit display