RTD Alarms and Transmitters

  • 6 Year 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
Links
Product brochure
Options & accessories
Regulatory compliance

Click on PDF links below
for product information
Reference Info
Ground Loops
RFI/EMI
LoopTracker and Output Test
Sink or Source

Applications
Dam Bubbler
Chiller Temperature
Bearing Temperature
Motor Temperature
Motor Overheating
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?
Ready to order?
Other ways to order
Model Input/Output Features Product

RTD or Thermistor Input Alarm Trips


Factory Configured

APD 1401  from $379
APD 1421  from $399

Open Datasheet
Download Datasheet
RTD: specify type, 2, 3 or 4 wire, and temperature range
Factory configured
10 Ω to 2000 Ω RTD including
100 Ω: 0.00385α, 0.003916α, 0.00392α,
10 Ω Cu, 1000 Ω Ni-Fe,
120 Ω Ni or Special

Thermistor: specify type and temperature range.
For other sensor types provide temperature-resistance chart.

Factory configured
44004/44033 2.252 kΩ at 25°C
44005/44030 3.000 kΩ at 25°C
44007/44034 5.000 kΩ at 25°C
44006/44031 10.00 kΩ at 25°C
44008/44032 30.00 kΩ at 25°C
YSI 400 2.252 kΩ at 25°C
Spectrum 1003k 1 kΩ

APD 1401 Single Alarm Trip
Dual DPST contact sets
Standard: HI alarm, non-latching, normal acting

APD 1421 Dual Alarm Trip
Two DPST contact sets
Standard: HI/LO alarms, normal acting,
two set/reset adjustments, non-latching

See data sheet for alarm options

  • New microprocessor-based version
    • Complete RTD or thermistor selection
    • Microprocessor controlled input linearization
    • More burnout options
    • Improved setpoint/reset point control
  • 2-, 3-, or 4-wire RTD
  • Lead wire compensation for 3-, or 4-wire
  • User adjustable set and reset point(s)
  • 8 Amp contacts
  • Removable plugs for easier installation
  • Input LoopTracker LED and output test button
  • Alarm status LEDs
  • Alarm options: LO, HI/HI, LO/LO, band alarm
  • Optional reverse acting, optional latching
  • DIN rail mount without tools
  • Universal power 85-265 VAC, 60-300 VDC
  • D option for 9-30 VDC, 10-32 VAC power


APD 1421
APD 1401, APD 1421

RTD Input Alarm Trips


Factory Configured

APD 1400  from $369
APD 1420  from $389

Open Datasheet
Download Datasheet
Specify RTD type and temperature range
Factory configured
10 Ω to 2000 Ω RTD including
100 Ω: 0.00385α, 0.00391α,
10 Ω Cu, 1000 Ω Ni-Fe,
120 Ω Ni or Special

APD 1400 Single Alarm Trip
Dual SPDT contact sets
Standard: HI alarm, non-latching, normal acting
See data sheet for alarm options

APD 1420 Dual Alarm Trip
2 independent SPDT contact sets
Standard: HI/LO alarms, non-latching, normal acting
See data sheet for alarm options

  • 2-wire or 3-wire RTD
  • Lead wire compensation for 3-wire
  • User adjustable setpoint(s)
  • User adjustable deadband(s)
  • 8 Amp SPDT contacts
  • Input LoopTracker LED
  • Alarm status LEDs
  • Alarm options: LO, HI/HI, LO/LO
  • Optional reverse acting
  • Optional latching alarms
  • Push to test/reset
  • Remote push to test/reset
  • Full I/O/power isolation
  • Removable plugs
  • DIN rail mount without tools
  • Universal power 85-265 VAC, 60-300 VDC
  • D option for 9-30 VDC, 10-32 VAC power

APD 1400UL approved
APD 1400, APD 1420

RTD Input Alarm Trips


Factory Configured

API 1400 G  from $309
API 1420 G  from $339

Open Datasheet
Download Datasheet
Specify RTD type and temperature range
Factory configured
10 Ω to 2000 Ω RTD including
100 Ω: 0.00385α, 0.00391α,
10 Ω Cu, 1000 Ω Ni-Fe,
120 Ω Ni or special

API 1400 G Single Alarm Trip
One DPDT contact set, adjustable deadband
Standard: HI alarm
Optional: LO alarm

API 1420 G Dual Alarm Trip
Two SPDT contact sets, 1% deadband
Standard: HI/LO alarms, normal acting
Optional: LO/HI, HI/HI, LO/LO alarms

  • User adjustable setpoint(s)
  • 2-wire or 3-wire RTD
  • Lead wire compensation for 3-wire
  • 8 Amp contacts
  • Hot-swappable plug-in design
  • Input LoopTracker LED
  • Alarm status LEDs
  • Alarm options: LO, HI/HI, LO/LO
  • Output test button
  • Uses API-011 11-pin socket
  • 115 VAC powered
  • A230 option for 230 VAC
  • P option: 85-265 VAC, 60-300 VDC power (+$60)
  • D option: 9-30 VDC power (+$60)

Api 1400G
API 1400 G, API 1420 G

RTD to DC Isolated Transmitter


Factory Configured

APD 4001  from $449

Open Datasheet
Download Datasheet
Specify RTD type and temperature range
10 Ω to 2000 Ω RTD including
100 Ω: 0.00385α, 0.00391α,
10 Ω Cu, 1000 Ω Ni-Fe,
120 Ω Ni or special

Specify output range
0-1 V to 0-10 V
±1 V to ±10 V
0-1 mA to 0-20 mA, 4-20 mA
  • RTD linearization
  • Removable plugs
  • I/O LoopTracker LEDs
  • Output test button
  • Full I/O/power isolation
  • 2-wire or 3-wire RTD
  • Lead wire compensation for 3-wire
  • DIN rail mount
  • Universal power 85-265 VAC, 60-300 VDC
  • D option for 9-30 VDC, 10-32 VAC power

APD4001UL approved
APD 4001

Universal Input to DC Isolated Signal Conditioner


Field Programmable


APD 8000  from $529

*Free I/O Range Setup*
Include your I/O ranges on your order,
and we'll set it up for you!

Open Datasheet
Download Datasheet

Open Feature Summary
Download Feature Summary
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 sink/source output
  • 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

APD8000UL approved
APD 8000

RTD to DC Isolated Transmitter


Factory Configured

API 4001 G L  from $449

Open Datasheet
Download Datasheet
Specify RTD type and temperature range
Factory configured
10 Ω to 2000 Ω RTD including
100 Ω: 0.00385α, 0.00391α
10 Ω Cu, 1000 Ω Ni-Fe,
120 Ω Ni or special

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

  • RTD linearization
  • Hot-swappable plug-in design
  • I/O LoopTracker LEDs
  • Output test button
  • Full I/O/power isolation
  • 2-wire or 3-wire RTD
  • Lead wire compensation for 3-wire
  • Uses API-008 8-pin socket
  • 115 VAC powered
  • A230 option for 230 VAC
  • P option: 85-265 VAC, 60-300 VDC power (+$60)
  • D option: 9-30 VDC power (+$60)



Api 4001G L UL listed
API 4001 GL

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

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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

  • CE logo  EX
K121
K121

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

UL Listed   CE logo
K107A
K109PT

IsoSplitter® Signal Splitter
1 RTD Input to 2 DC Outputs


Factory Configured

APD 1393  from $609

Open Datasheet
Download Datasheet
Specify RTD type and temperature range
Factory configured
10 Ω to 2000 Ω RTD including
100 Ω 0.00385α
100 Ω 0.00391α,
10 Ω Cu
1000 Ω Ni-Fe
120 Ω Ni or special

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
  • One RTD input
  • Two independent DC output channels
  • 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

RTD IsoSplitterUL approved
APD 1393

DuoPak® 2 Channel Isolated Signal Conditioners


Factory Configured

APD 2000 Series  from $609

Specify input range for each channel

APD 2001 Ch1: DC mV/V/mA Ch2: RTD
APD 2011 Ch1: RTD Ch2: RTD
APD 2013 Ch1: RTD Ch2: Potentiometer
APD 2015 Ch1: RTD Ch2: Strain gauge
APD 2016 Ch1: RTD Ch2: AC mV/V/mA
APD 2017 Ch1: RTD 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

DuoPakUL approved
APD 2000 Series RTD

RTD to DC Isolator/Converter
2/3/4 wire RTD to mA/V output


Z109PT2-1  $259

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Open Installation Manual
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Download .dwg CAD Drawing
Download .stp 3-D Drawing

Input
One RTD
Selectable for Pt100, Pt500, Pt1000, Ni100
2/3/4 wire
Configurable range

Output
One isolated mA or Voltage
Sink or source mA
Configurable range

CE UL

Z109PT2-1
Z109PT2-1

Universal Input to DC Isolator/Converter
V, mA, Ohms, TC, RTD


Z109REG2-1  $289

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Download Brochure

Open Installation Manual
Download Installation Manual

Click to see ALL Seneca products


Download .dwg CAD Drawing
Download .stp 3-D Drawing

Configurable Input
mV, V, (Bipolar from 75 mV to 20 V)
mA (Bipolar up to 20 mA)
RTD: Pt100, Pt500, Pt1000, Ni100, KTY81, KTY84, NTC; 3-4 wire
Thermocouple: Type J, K, R, S, T, E, B, N,
Potentiometer: 500 Ω to 100 kΩ
Rheostat: 500 Ω to 25 kΩ
Strobe: Alternative to output relay

Output
One isolated mA or Voltage
Sink or source mA
Configurable range
1 relay output

CE UL

Z109REG2-1
Z109REG2-1

Analog To Resistance Converter


Factory Configured

ATR167  call for quote

Open Datasheet
Download Datasheet
Specify input type and range
RTD
Thermocouple
Frequency to 5kHz
Pulse input from proximity sensor
Millivolt/Volts
Potentiometer or resistance

Specify output range
Potentiometer: 1k, 2k, 5k, 10k, 20k, 50k, 100k, 200k, custom
  • High resolution true analog output
  • 3-wire pot or 2-wire variable resistor output simulation
  • Front zero and span pots
  • Output level LED
  • Full I/O/power isolation
  • Universal power options: 8 VDC to 280 VAC
Typical applications include
  • Convert a thermocouple to RTD signal to
    match dissimilar equipment
  • Automatic gain control
Analog To Resistance Converter ATR167
ATR167

Analog To Potentiometer Converter


Factory Configured

ATP 168  call for quote

Open Datasheet
Download Datasheet
Specify input type and range
RTD
Thermocouple
Frequency to 5kHz
Pulse input from proximity sensor
Millivolt/Volts
Potentiometer or resistance

Specify output range
Potentiometer: 1k, 2k, 5k, 10k, 20k, 50k, 100k, 200k, custom
  • Convert a signal to a potentiometer output
  • 3-wire pot or 2-wire variable resistor output simulation
  • 8 bit output resolution (255 count)
  • Front zero and span pots
  • Output level LED
  • Full I/O/power isolation
  • Universal power options: 8 VDC to 280 VAC
Typical applications include
  • Replace mechanical pot used for control of
    existing machinery
  • Automatic control of instrument gain or offset
  • Provide programmable adjustment for delays,
    filters or time constants.
Analog To Potentiometer Converter ATP168
ATP168

ThermoPro®
Battery Powered RTD Temperature Indicator


Field Configurable


T16B   $409
T16BBL: Backlit display  $439

Open Datasheet
Download Datasheet
T16BBL: Backlit display
  • Specify RTD length
  • Specify fixed or spring-loaded RTD
  • Use spring-loaded for a thermowell
  • Specify default temperature units
    • –58.0°F to 392.0°F or
    • –50.0°C to 200.0°C or
    • 223.0 K to 473.0 K
  • Choose auto shutoff time
    • -5 five minutes (default if not specified)
    • -10 ten minutes
    • -30 thirty minutes
    • -ON on/off only
  • See data sheet for complete model numbers
  • Battery life to 1000 hrs
  • BL red LED display backlight battery life up to 750 hrs
  • Includes 2 AA batteries
  • Configurable auto shutoff time
  • Selectable °F, °C or K
  • Selectable auto shutoff time
  • Configurable min/max memory
  • Able to retain min/max if power is off
  • Pass code protected setup and calibration

ThermoPro battery powered
T16B

ThermoPro®
Loop Powered Indicating RTD Transmitter


Field Configurable


T16L   $409

Open Datasheet
Download Datasheet
  • Specify RTD length
  • Specify fixed or spring-loaded RTD
  • Use spring-loaded for a thermowell
  • Specify temperature range of output
    • –58.0°F to 392.0°F or
    • –50.0°C to 200.0°C or
    • 223.0 K to 473.0 K
  • See data sheet for complete model numbers
  • 2-wire design
  • Powered by 8-32 VDC 4-20 mA current loop
  • User-programmable 4-20 mA output range
  • Selectable °F, °C or K
  • Pass code protected setup and calibration
  • Old model number: F16LT

ThermoPro loop owered temperature transmitter
T16L

ThermoPro®
Indicating RTD Temperature Alarms


Field Configurable


T16ADA   $499
T16ADABL: Backlit display  $529

Open Datasheet
Download Datasheet
  • Specify RTD length
  • Specify fixed or spring-loaded RTD
  • Use spring-loaded for a thermowell
  • Specify default temperature units
    • –58.0°F to 392.0°F or
    • –50.0°C to 200.0°C or
    • 223.0 K to 473.0 K
  • See data sheet for complete model numbers
  • User-programmable alarms
    • User-programmable alarm logic
    • User-programmable setpoints
    • 2 SPDT relays
    • 1A@24 VDC, or 0.5A@115VAC, non-inductive
  • Selectable °F, °C, or K temperature units
  • Powered by 8-32 VDC, 10-32 VAC
  • User configurable relay operation
  • Push to test alarms
  • Pass code protected setup and calibration

ThermoPro alarm
T16ADA

Head-Mount RTD Transmitter, Non-Isolated


Field Programmable


Fits DIN Form B Heads

T120  $89 *stock item*

T120-C  $109 pre-programmed to order

Open Datasheet
Download Datasheet

Open Installation Manual
Download Installation Manual

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Programmable
Requires EASY-USB for configuration

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
  • DIN B mount with 5.8 mm (0.228" dia) center hole
  • Power: 19.2 to 30 VDC current loop

T121  CE logo

T120

Head-Mount Universal Transmitter, Isolated


Field Programmable


Fits DIN Form B Heads

T121  $159 *stock item*

T121-C  $179 pre-programmed to order

Open Datasheet
Download Datasheet

Open Installation Manual
Download Installation Manual

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Programmable
Requires EASY-USB for configuration

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
  • I/O isolation
  • DIN B with 5.8mm (0.228"dia) center hole
  • Power: 7 to 30 VDC current loop

T121   CE logo

T121

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)
EASY-USB
EASY-USB

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

CE logo
S315
S315