Seneca Signal Conditioners, Converters, Isolators, Transmitters
- 1 Year Warranty
- Hot-Swappable Design
- Economical
- Full I/O/Power Isolated Versions
*stock item* normally stocked, but call for number on hand
Quantities available may vary on a daily basisPlease call to confirm quantities and lead time

for product information
Literature and Links
Seneca product brochure
Seneca current sensors
Seneca accessories and software
Seneca declaration of origin
Seneca declaration of conformity
Seneca product brochure
Seneca current sensors
Seneca accessories and software
Seneca declaration of origin
Seneca declaration of conformity
How to Order
- Select a model
- See data sheet for ordering info and power options
- Request a price via phone, chat, or email
- Stock to 1-2 week typical lead time (USA customers)
- 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?
Model
Input/Output
Features
Product
DC to DC Isolated Signal Conditioner
Field Configurable
K109UI $169 *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
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



K109UI
DC to DC Isolated Transmitter
with Sink/Source Input
Field Configurable
K109S $169 *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
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



K109S
Universal Input to 4-20 mA Loop Powered Transmitter
Field Programmable
K121 $149 *stock item*
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
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



K121
Thermocouple to DC Isolated Transmitter
Field Configurable
K109TC $169 *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
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



K109TC
100 Ω RTD to DC Isolated Transmitter
Field Configurable
K109PT $169 *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
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



K109PT
RS-485 to RS-485 or
RS-232 to RS-485
Repeaters/Isolators/Amplifiers
K107A $159
K107B $159
*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
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




K107A K107B
K-SUPPLY and KBUS Power Supply
for K-Series Modules
K-SUPPLY $89
*stock item*
KBUS $15
*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
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



K-SUPPLY K-BUS
Strain Gauge/Load Cell/Bridge Input / RS485 Modbus and Analog Output
Z-SG $250 *stock item*
Open Z-SG datasheet
Download Z-SG datasheet
Open Z-SG installation
Download Z-SG installation
Open Z-SG user manual
Download Z-SG usr manual
Open Z-SG calibration procedure
Download Z-SG calibration procedure
Field Configurable Input
Input: One input channel connection for up to 4 (350 Ω) or
8 (1000 Ω) strain gauge load cells
4 or 6 wire
Excitation supply
Sensitivity: 1 to 64 mV/V
Switch I/O for either tare or alarm
Field Configurable Output
Output: 4-20 mA, 0-20 mA
0-5 V, 0-10 V
Modbus RTU with backplane connector system
Open Z-SG application note
Download Z-SG application note
Download Z-SG DWG CAD file
Download Z-SG 3D STP CAD file
Download Z-series LabView drivers
Input: One input channel connection for up to 4 (350 Ω) or
8 (1000 Ω) strain gauge load cells
4 or 6 wire
Excitation supply
Sensitivity: 1 to 64 mV/V
Switch I/O for either tare or alarm
Field Configurable Output
Output: 4-20 mA, 0-20 mA
0-5 V, 0-10 V
Modbus RTU with backplane connector system
Open Z-SG application note
Download Z-SG application note
Download Z-SG DWG CAD file
Download Z-SG 3D STP CAD file
Download Z-series LabView drivers
- Only 17.5 mm wide
- DIP switch configuration
- Calibration via S117P1 or push button
- 3-way isolation
- Low cost
- DIN rail mount without tools
- Power: 10-40 VDC, 19-28 VAC


Z-SG
Strain Gauge/Load Cell/Bridge Input
Modbus RTU and Analog Output
Advanced Features
Z-SG2 $260
Open Z-SG/Z-SG2 datasheet
Download Z-SG/Z-SG2 datasheet
Open Z-SG/Z-SG2 installation
Download Z-SG/Z-SG2 installation
Open Z-SG2 user manual
Download Z-SG2 user manual
Field Configurable Input
Input: One input channel connection for up to 4 (350 Ω) or
8 (1000 Ω) strain gauge load cells
4 or 6 wire
Excitation supply
Sensitivity: 1 to 64 mV/V
Switch I/O for either tare or alarm
Field Configurable Output
Output: 4-20 mA, 0-20 mA
0-5 V, 0-10 V
Modbus RTU requires backplane connector system
Configure with EASY SETUP software and standard micro-USB cable
0.01% FS accuracy class
24 bit analog-digital conversion
Upgradeable firmware
Settable sampling rate
Alarm with programmable hysteresis
Configurable resolution
Settable floating-point value
Stabilized measurement with noise filter
Download EASY SETUP software
Download Z-series LabView drivers
Download Z-SG2 DWG CAD file
Download Z-SG2 3D STP CAD file
Input: One input channel connection for up to 4 (350 Ω) or
8 (1000 Ω) strain gauge load cells
4 or 6 wire
Excitation supply
Sensitivity: 1 to 64 mV/V
Switch I/O for either tare or alarm
Field Configurable Output
Output: 4-20 mA, 0-20 mA
0-5 V, 0-10 V
Modbus RTU requires backplane connector system
Configure with EASY SETUP software and standard micro-USB cable
0.01% FS accuracy class
24 bit analog-digital conversion
Upgradeable firmware
Settable sampling rate
Alarm with programmable hysteresis
Configurable resolution
Settable floating-point value
Stabilized measurement with noise filter
Download EASY SETUP software
Download Z-series LabView drivers
Download Z-SG2 DWG CAD file
Download Z-SG2 3D STP CAD file
- Only 17.5 mm wide
- EASY SETUP software and DIP switch configuration
- Calibration via software or push button
- 3-way isolation
- Low cost
- DIN rail mount without tools
- Power: 10-40 VDC, 19-28 VAC



Z-SG2
Load Cell, Strain Gauge, Bridge
Sum Board / Sum Box
SG-EQ4 $85
Board onlySG-EQ4-BOXPG7 $345
Board in boxOpen SG-EQ4 instructions
Download SG-EQ4 instructions
Open SG-EQ4 installation
Download SG-EQ4 installation
Input
Up to 4 strain gauges
Output
Summed signal from up to 4 strain gauges
Up to 4 strain gauges
Output
Summed signal from up to 4 strain gauges
- Connect up to 4 strain gauges
- For 4-wire / 6-wire load cells
- Internal jumpers for configuration
- Trim pots for equalized 4 wire signal

SG-EQ4

SG-EQ4-BOXPG7
Z-Series Backplane Connector
Z-PC-DINAL1-35 $40
Open Z-PC-DINAL datasheet
Download Z-PC-DINAL datasheet
Open Z-PC-DIN overview
Download Z-PC-DIN overview
Head terminal + 1 slot
For one 17.5mm or one 35mm wide Z-PC module
Connect power
Connect Modbus
Required for Modbus connection
For one 17.5mm or one 35mm wide Z-PC module
Connect power
Connect Modbus
Required for Modbus connection
DIN rail mount with screw terminals, 1 slot
Connect one 17.5 or 35mm Z-PC series module
Connect one 17.5 or 35mm Z-PC series module

Z-PC-DINAL1-35
Z-Series Backplane Connector
Z-PC-DINAL2-17.5 $47.50 *stock item*
Open Z-PC-Z-PC-DINAL datasheet
Download Z-PC-DINAL datasheet
Open Z-PC-DIN overview
Download Z-PC-DIN overview
Head terminal + 2 slots
For one or two 17.5mm wide Z-PC modules
Connect power
Connect Modbus
Required for Modbus connection
For one or two 17.5mm wide Z-PC modules
Connect power
Connect Modbus
Required for Modbus connection
DIN rail mount with screw terminals, 2 slots
Connect one or two 17.5mm Z-PC series modules
Connect one or two 17.5mm Z-PC series modules

Z-PC-DINAL2-17.5
Z-Series Backplane Extender
Z-PC-DIN2-17.5 $30 *stock item*
Open Z-PC-DIN2 datasheet
Download Z-PC-DIN2 datasheet
Open Z-PC-DIN overview
Download Z-PC-DIN overview
2 slot extension terminal
For one or two 17.5mm wide Z-PC modules
Connect power
Connect Modbus
Required for Modbus connection
For one or two 17.5mm wide Z-PC modules
Connect power
Connect Modbus
Required for Modbus connection
DIN rail mount with 2 slots
Add one or two 17.5mm Z-PC series modules
Add one or two 17.5mm Z-PC series modules

Z-PC-DIN2-17.5
24 VDC Loop Power Supply
Z-SUPPLY $199 *stock item*
Open Datasheet
Download Datasheet
Open Installation Manual
Download Installation Manual
Click to see ALL Seneca products
Download CAD Drawing
Input Power
110 VAC to 230 VAC, 47-63 Hz, 0.7 A, or
110 VDC to 315 VDC, 0.7 A
Output
24 VDC ±2%, 1.5 A max.
110 VAC to 230 VAC, 47-63 Hz, 0.7 A, or
110 VDC to 315 VDC, 0.7 A
Output
24 VDC ±2%, 1.5 A max.
- 1 year warranty
- 1.5 kV isolation
- LEDs for input power and status
- "Power good" status relay
- Short-circuit and over-load protection


Z-SUPPLY
Z110 Loop Powered Isolators
1 Channel or 2 Channel
Z110S $139
*stock item*
Z110D $190
*stock item*
Open Datasheet
Download Datasheet
Open Installation Manual
Download Installation Manual
Click to see ALL Seneca products
Download CAD Drawing
Input
Z110S: One 4-20 mA loop
Z110D: Two 4-20 mA loops
Output
Z110S: One isolated 4-20 mA loop
Z110D: Two isolated 4-20 mA loops
Z110S: One 4-20 mA loop
Z110D: Two 4-20 mA loops
Output
Z110S: One isolated 4-20 mA loop
Z110D: Two isolated 4-20 mA loops
- Replaces API LPI-1
- Replaces API LPI-2
- Replaces API DPI-2
- Powered by the input loop
- 1 year warranty
- DIN rail mount
- 17.5 mm wide

Z110S


Z110D
RS232/USB, TTL/USB, RS485/USB Isolated Serial Converter
Seneca S117P-1 $260 *stock item*
Open S117P-1 datasheet
Download S117P-1 datasheet
Open S117P-1 installation
Download S117P-1 installation
S117P-1 Software
Download S117P-1 Software
Programming kit for
T120
T121
Z-SG
T120
T121
Z-SG
Includes
Converter box
Software mini CD (or download latest)
Adapter cable
Converter box
Software mini CD (or download latest)
Adapter cable

S117P1
4 Digit 4-20 mA Loop Powered Display
Field Rangeable
S315 $139
*stock item*
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
Input: 4-20 mA
Display: 4 digit red LED
- 1/8 DIN panel mount or IP66 housing
- Scaleable 4 digit display


S315
USB - UART TTL Converter
EASY-USB $109 *stock item*
Open Datasheet
Download Datasheet
Open Installation Manual
Download Installation Manual
EASY-USB Software Link
Programming kitK121
K121
K121
Includes
Converter
Software mini CD (or download latest)
Adapter cable (std USB cable not included)
Converter
Software mini CD (or download latest)
Adapter cable (std USB cable not included)

EASY-USB
Head-Mount RTD Transmitter, Non-Isolated
Field Programmable
Fits DIN Form B Heads
T120 $89 *stock item*
Open Datasheet
Download Datasheet
Open Installation Manual
Download Installation Manual
Click to see ALL Seneca products
Programmable
Input: Pt100 or Ni100 RTD
2, 3, or 4 wire
Selectable Output
Output: 4-20 mA, 20-4 mA
Input: Pt100 or Ni100 RTD
2, 3, or 4 wire
Selectable Output
Output: 4-20 mA, 20-4 mA
- Order T120-C and specify I/O for pre-programmed model
- 44 mm dia
- EASY-USB configuration
- Low cost
- DIN B mount with 5.8 mm (0.228" dia) center hole
- Power: 19.2 to 30 VDC current loop


T120
Head-Mount Universal Transmitter, Isolated
Field Programmable
Fits DIN Form B Heads
T121 $159 *stock item*
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
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


T121
AC Current Transmitter Loop Powered
Field Selectabe Ranges
Open Current Sensor Overview
Download Current Sensor Overview
T201 to 40A $99 *stock item*
Open Installation ManualDownload Installation Manual
Input T201
5, 10, 15, 20, 25, 30, 35, 40 Amps AC
Output
4-20 mA
Power
5-28 VDC current loop
- Measures AC Current
- DIP-switch selectable ranges
- Solid core design



T201
DC Current Transmitters Loop Powered
Field Selectabe Ranges
Open Current Sensor Overview
Download Current Sensor Overview
T201DC to 40A $159 *stock item*
Open T201DC Installation ManualDownload T201DC Installation Manual
T201DC100 to 100A $219
Open T201DC100 Installation ManualDownload T201DC100 Installation Manual
Input T201DC
5, 10, 20, 40,
±5, ±10, –5-20,
–10-40 ADC
Input T201DC100
10, 25, 50, 100,
±5, ±10, –5-20,
–10-40 ADC
Output
4-20 mA
Power
5-28 VDC current loop
- Measures DC Current
- DIP-switch selectable ranges
- Solid core design



T201DC 40 Amp DC

T201DC 100 Amp DC
AC/DC Hall Effect Current Transmitters 0-10V Output
Field Selectable Ranges
Open Current Sensor Overview
Download Current Sensor Overview
T201DCH 50A $109 *stock item*
Open T201DCH Installation ManualDownload T201DCH Installation Manual
T201DCH100 100A $149
Open T201DCH100 Installation ManualDownload T201DCH100 Installation Manual
T201DCH300 300A $159 *stock item*
Open T201DCH300 Installation ManualDownload T201DCH300 Installation Manual
Input T201DCH
25, 50 ADC/AAC
Input T201DCH100
50, 100 ADC/AAC, ±50, ±100 ADC
Input T201DCH300
150, 300 ADC/AAC, ±150, ±300 ADC
Output
0-10 VDC
Powered by
10-28 VDC
- Hall Effect measures AC or DC
- DIP-switch selectable ranges
- Solid core design



T201DCH 50 Amp

T201DCH 100, 300 Amp
AC/DC Hall Effect Current Transmitters Loop Powered
Field Selectable Ranges
Open Current Sensor Overview
Download Current Sensor Overview
T201DCH50-LP 50A $109
Open T201DCH50-LP Installation ManualDownload T201DCH50-LP Installation Manual
T201DCH100-LP 100A $149
Open T201DCH100-LP Installation ManualDownload T201DCH100-LP Installation Manual
T201DCH300-LP 300A $159
Open T201DCH300-LP Installation ManualDownload T201DCH300-LP Installation Manual
Input T201DCH50-LP
50 ADC/AAC, ±50 ADC
Input T201DCH100-LP
50, 100 ADC/AAC, ±50, ±100 ADC
Input T201DCH300-LP
150, 300 ADC/AAC, ±150, ±300 ADC
Output
4-20 mA
Power
9-28 VDC current loop
- Hall Effect measures AC or DC
- DIP-switch selectable ranges
- Solid core design



T201DCH 50 Amp

T201DCH 100, 300 Amp
AC to DC Isolated Current Measurement
Field Configurable
Z201-H $179
Module power: 85-265 VAC/VDCZ201 $179
Module power: 19-40 VDC, 19-28 VACOpen Datasheet
Download Datasheet
Open Z201-H manual
Download Z201-H manual
Open Z201 manual
Download Z201 manual
Field selectable input ranges
0-5 Amps AC
0-10 Amps AC
Selectable via wiring terminal
Field selectable output ranges
0-1 V, 0-5 V, 0-10 V, 2-10 V
0-20 mA, 4-20 mA sink or source
0-5 Amps AC
0-10 Amps AC
Selectable via wiring terminal
Field selectable output ranges
0-1 V, 0-5 V, 0-10 V, 2-10 V
0-20 mA, 4-20 mA sink or source
- Full I/O/power isolation
- Selectable sink/source mA output
- Mount to 35 mm DIN rail
- Z201-H power: 85-265 VAC/VDC
- Z201 power: 19-40 VDC, 19-28 VAC



Seneca Z201-H and Z201