RTD Alarms and Transmitters

• Lifetime Warranty on API Modules
• LoopTracker ^® LEDs
• Hot-Swappable Plug-In Design
• Zero and Span Transmitter 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

Sink or Source
LoopTracker and Output Test
Signal Conditioner Terminology
Industry Terminology
RFI & EMI
Ohm's Law
What is a Ground Loop?
Installation FAQs

Applications

Dam Bubbler
Measure Heat Exchanger Δ Temperature
Control Heat Exchanger Δ Temperature
Chiller Temperature
Bearing Temperature
Motor Temperature
Motor Overheating
Motor Bearings

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?

RTD or Thermistor Input Alarm Trips

Factory Configured

APD 1401  from $289
APD 1421  from $309

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

RTD Input Alarm Trips

Factory Configured

API 1400 G  from $279
API 1420 G  from $299

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 for 85-265 VAC, 60-300 VDC power
• D option for 9-30 VDC power

RTD to DC Isolated Transmitter

Factory Configured

APD 4001  from $409

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

Universal Temperature Input to DC Isolated Transmitter

Field Programmable

APD 4000

Special order, see APD 8000
Open Datasheet
Download Datasheet
Open Feature Summary
Download Feature Summary

Field programmable inputs
Thermocouples: J, K, T, E, R, S, N, B, C, D, G, M, P
RTDs: 2, 3, or 4 wire, 10Ω to 8000Ω RTDs
Thermistors: 44000 series, YSI 400, Spectrum
Custom input available
18 field selectable 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

• Covers all common temperature sensors
• 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

Universal Input to DC Isolated Signal Conditioner

Field Programmable

APD 8000  from $419

*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 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

Universal RTD to DC Isolated Transmitter

Field Programmable

APD 4151

Special order, see APD 8000
Open Datasheet
Download Datasheet

Field programmable input
RTD: 2, 3, or 4 wire, 10 Ω to 8000 Ω RTD
Custom input available
18 field selectable 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

• Covers all common RTD sensors
• 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

RTD to DC Isolated Transmitter

Factory Configured

API 4001 G L  from $409

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 for 85-265 VAC, 60-300 VDC power
• D option for 9-30 VDC power

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

• 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

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

• 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 Temperature to DC Isloated Transmitter

Field Programmable

Sineax V624

Open Datasheet
Download Datasheet
Open Installation Manual
Download Installation Manual
Download Software

T/C types
J, K, T, E, R, S, N, B, W5, W3, L, U
RTD, 2-, 3-, or 4-wire
100 Ω 0.00385α
100 Ω 0.003916α
Thermistor
Software for custom input linearization
Specify if Current or Voltage Output
0-2 mA to 0-20 mA, 20-0 mA
0-1 V to 0-10 V, 10-0 V

• PC Programmable
• Reverse Output Programmable
• Custom Input Linearization
• Programmable Sensor Fault Response
• Removable Plugs
• 3.7 kV Input/Output/Power Isolation
• 24-60 or 85-230 VAC/VDC Powered
• 3 Year Warranty

IsoSplitter ^® Signal Splitter
1 RTD Input to 2 DC Outputs

Factory Configured

APD 1393  from $499

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

DuoPak ^® 2 Channel Isolated Signal Conditioners

Factory Configured

APD 2000 Series  from $519

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

Process Signal to Bi-Polar DC Signal Converter

Factory Configured

BSC133  call for quote

BSC133 Data Sheet
BSC133 More Information

Specify input type and range
AC/DC current/millivolt/volts
pH/ORP
RTD
Thermocouple
Frequency to 5kHz
Pulse input from proximity sensor
LVDT
Potentiometer or resistance
Specify output type and range
Bi-polar volts; ±1V to ±20V
Bi-polar mA; ±1mA to ±20mA
Output Options

• Output ramp
• External ratio 0.5 - 1.5
• High current output
• Auxiliary supply 24VDC/25mA max
• External bipolar supply
• Peak hold (max. hold 120 min)
• Track and hold (max. hold 120 min)

• Load independent bi-polar output
• High power output & dither options for hydraulic applications
• Adder or subtractor options
• Output ramp, external ratio peak hold and track & hold options
• Sensor excitation
• Full I/O/power isolation
• Universal power options: 8 VDC to 280 VAC

Typical applications include

• Signal conversion
• Hydraulic drive and solenoid actuation

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 existing equipment
• Automatic gain control

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 instrumentation gain or offset
• Provide programmable adjustment for delays, filters or time constants.

ThermoPro ^®
Battery Powered RTD Temperature Indicator

Field Configurable

T16B   $389
T16BBL: Backlit display  $419

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 ^®
Loop Powered Indicating RTD Transmitter

Field Configurable

T16L   $389

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 ^®
Indicating RTD Temperature Alarms

Field Configurable

T16ADA   $479
T16ADABL: Backlit display  $499

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

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

• 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

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

• 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 *stock item*

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 *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

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