• Push Button Calibration
• RTD Sensor Input
• Drift Free Digital Linearization
• Re-Rangeable Without a PC
• LED Over-Range Indication
• One Spare Transmitter
 Can Cover Entire Range
• Reverse Polarity Protection

The RdF 2910 in-head RTD temperature transmitter incorporates the latest in digital technology accuracy ensuring drift free operation. The transmitter connects to any
standard RTD and draws 4 to 20 mA linear with temperature. Since the zero and span
are set to conform to a particular sensor type, the sensor temperature coefficient of
resistance (“a = 0.00385, 0.003916, 0.003923, etc...”) has negligible effect on accuracy.


Sensor Temperature Range
–200°C to 850°C
–328°F to 1562°F

RTD Sensing Element
3 Wire 100Ω Platinum RTD DIN 43760;
IEC 751 (a = 0.00385 Ω/Ω/°C)
JIS1604 (a = 0.003916 Ω/Ω/°C)

Calibrated Accuracy and Linearity
±0.1°C ±0.1% from –100°C to 510°C
±0.2°C ±0.1% from –150°F to 950°F
±0.2°C ±0.2% from –200°C to 840°C
±0.4°C ±0.2% from –320°F to 1550°F

Minimum Span
20°C (40°F)

Excitation Current
1 mA maximum

Sample Rate
500 mS per sample

Red LED indicates open RTD
or over-range
Maximum current: 22 mA

Thermal Drift
Zero = ±0.12mA /°F
Span = ±0.28mA /°F

Warm Up Time
2 minutes to full accuracy

Programming Switch
Momentary push button

Lead Resistance
Maximum 10Ω/leg
Effect 0.02% full range output
(plus lead resistance mismatch)


Teflon® is a registered trademark
of the DuPont Corporation.

Output Range 

Supply Voltage 

Voltage Effect 



4-20 mA 2 wire loop powered
(can be ranged 20-4 mA)
Maximum 3.8 to 22 mA

8 to 30 VDC



Up-Scale 22 mA
(Downscale to order)

Thermal Drift 

Response Time 

Loop Resistance 

Loop Noise 

Ripple Rejection 

Zero: ±0.12mA/°F
Span: ±0.28mA/°F

500 mS to reach 70% of Value

Max. 800R at 24 VDC

±0.1mA p-p

(measured @ 50 Hz 1 volt p-p)

Mechanical Details

    2910     Model Number, 2 Wire 4-20 mA RTD Transmitter
 Minimum Temperature, 4 mA Zero Temperature
 Maximum Temperature, 20 mA Span Temperature
 Temperature (°C or °F)
Without Connection Head
Head DIN B Cast Aluminum
Typical write-up for 2910
Calibrate with a small (3 mm) diameter screwdriver and an RTD simulator (or decade resistor).
1. Simulate the RTD resistance at the 4 mA temperature.
2. Press the programming switch (using the small   screwdriver)
     until the RED programming LED flashes.
3. Simulate the RTD resistance at the 20 mA temperature.
4. Press the programming switch (using the small   screwdriver)
     momentarily and the RED programming LED flashes quickly.