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 model numbers below
for data sheets
Literature and Links

API K-Line product brochure

Seneca accessories and software

Reference Info

Ground Loops
RFI / EMI
Sink vs Source



Seneca

Seneca Instruments, Italy


Call API today for information and pricing!
How to Order
  1. Select a model
  2. See data sheet for ordering info and power options
  3. See Price list
  4. Stock to 3 week typical lead time (USA customers)
  5. To place your order
Model Input/Output Features Product
DC to DC Isolated Transmitter
Thin DIN Style

K109UI datasheet

K109UI installation
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

UL Listed   CE logo 
K109UI
K109UI
DC to DC Isolated Transmitter
with Sink/Source Input

Thin DIN Style

K109S datasheet

K109S installation
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


UL Listed CE logo 
K109S
K109S
Universal Input to 4-20 mA Loop Powered Isolator
Thin DIN Style

K121 datasheet

K121 installation
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

  • 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

  • CE logo 
K121
K121
Thermocouple to DC Isolated Transmitter
Thin DIN Style

K109TC datasheet

K109TC installation
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

UL Listed   CE logo 
K109TC
K109TC
100 Ω RTD to DC
Isolated Transmitter

Thin DIN Style

K109PT datasheet

K109PT installation
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

UL Listed   CE logo 
K107A
K109PT
RS-485 to RS-485 or
RS-232 to RS-485
Repeaters/Isolators/Amplifiers

Thin DIN Style

K107A datasheet
K107B datasheet


K107A, K107B installation
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

UL Listed   CE logo 
K107A K107B
K107A            K107B

K-SUPPLY and KBUS power supply
for K-series modules

Thin DIN Style

K-SUPPLY, KBUS datasheet

K-SUPPLY, KBUS installation
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

CE logo
K107A
K-SUPPLY                 K-BUS
S315 and S315-IP66
4 Digit 4-20 mA Loop Powered Display

1/8 DIN

S315 and S315 datasheet

S315 and S315 installation
Loop Powered Display
Input: 4-20 mA
Display: 4 digit red LED

  • 1/8 DIN panel mount or IP66 housing
  • 4-20 mA scalable to any 4 digit engineering units

CE logo 
S315
S315