Thin DIN Signal Conditioners, Converters, Isolators, Transmitters

• 1 Year Warranty on K-Line Modules
• Hot-Swappable Design
• Economical
• Full I/O/Power Isolation

Click on PDF links below
for product information

Literature and Links
API K-Line product brochure
Seneca accessories and software
Reference Info
Ground Loops
RFI / EMI
Sink vs Source

Click to see ALL Seneca products

How to select your product

• Open pdf datasheet for your model
• Select model, range, units, options, accessories
• Contact us if you need assistance

Need a quote?

• Contact us at , or
• Get a quote via "Chat with us" below, or
• Call 800-942-0315 and ask for Sales

Ready to order?

• Send your order to
• If you don't have open terms with us,
  we'll call you for your credit card info

Other ways to order

• Click here to set up an account
• Click here to find your authorized dealer or
  if you are outside the USA
• Call us to find your local authorized distributor

DC to DC Isolated Signal Conditioner

Field Configurable

K109UI  $250 *stock item*

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  $250 *stock item*

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    $165 *stock item*

K121-C  $190 ranged to order

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

Field Programmable Input
Requires EASY-USB for configuration
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
• DIN rail mount without tools
• Powered by 4-20 mA loop

Thermocouple to DC Isolated Transmitter

Field Configurable

K109TC  $250 *stock item*

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

Field Configurable Input
Input: Thermocouple: J, K, T, E, R, S, N, B
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

100 Ω RTD to DC Isolated Transmitter

Field Configurable

K109PT  $250 *stock item*

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

Field Configurable Input
Input: One 100 Ω RTD, 385 Curve RTD, 2, 3, or 4 wire
–150 to 650°C, (–238 to 1202°F), 50°C min. span
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

RS-485 to RS-485 or
RS-232 to RS-485
Repeaters/Isolators/Amplifiers

K107A  $175
K107B  $175 *stock item*

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

K107A RS-485 to RS-485
Data X: One RS-485 half duplex
Data Y: One RS-485 half duplex
K107B RS-232 to RS-485
Data X: One RS-232 half duplex
Data Y: One RS-485 half duplex

• 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

USB - UART TTL Converter

EASY-USB  $140 *stock item*

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

Programming Kit for K121, T120, T121

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

K-SUPPLY and KBUS Power Supply
for K-Series Modules

K-SUPPLY  $99 *stock item*
KBUS  $17 *stock item*

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

Regulated Power Distribution
Input: 19.2 to 30 VDC
Output: 19.2 to 30 VDC

• Only 6.2 mm wide
• Power supply distribution
• Regulated and isolated
• Low cost
• DIN rail mount without tools
• Power: any 19.2-30 VDC supply

4 Digit 4-20 mA Loop Powered Display

Field Rangeable

S315  $150 *stock item*
S315-IP66  $310

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