• Provides DC Output Proportional to an RTD Input
• 3-Wire or 2-Wire, 10 ohms to 1000 ohms RTDs
• Test Points for Loop Current Monitoring without Breaking Loop Circuit
• Linearized for Platinum RTDs
• Unlimited Choice of Input Ranges via Interchangeable Range Cards (Within specified range limits)
• Reverse Polarity-Protected
• 50 mm Diameter Case - 33 mm Mounting Hole Spacing
• NEMA-4 Connection Head and Explosion-Proof Housing Available
• Low Cost
• 5 Year Warranty

The SR2300 is a low-cost, reliable, RTD input two-wire transmitter for field or panel mounting in various industrial housings and enclosures. It provide a DC output current (4/20 mA) proportional to an RTD input.

All Wilkerson products are designed with RFI filters and lightning protection to reduce susceptibility to electrical noise and damage by lightning. Ranging is accomplished via plug-in card which characterizes the input for the desired RTD type and sets the temperature range. Linearization is provided for platinum RTDs.

The SR2300 utilizes a single constant current source to excite the RTD. An accurate and stable leadwire compensation circuit uses the third lead of a 3-wire RTD to compensate for the RTD lead resistance. The output ZERO and SPAN controls are accessible through the top of the case. A Zero is adjustable ±20% and Span ±15%. Terminations are made to screw terminal connectors on the top of the case.

Test points located on the SR2300 front panel allow verification of loop current value, using a millammeter, without breaking the loop current.

TYPICAL APPLICATIONS

Remote temperature data acquisition

RTD INPUT 3-Wire or 2-Wire, 10 ohms to 1000 ohms Pt, Ni, Cu INPUT RANGE select any range from -100°C to +850°C (min span 20°F/10°C) EXCITATION CURRENT 2.4 mA (10 ohms to 500 ohms) 0.24 mA (> 500 ohms) OUTPUT RANGE 4/20 mA Current limited = 35 mA MAX LOAD RESISTANCE = [(V supply - 10)/20 mA] kilohms RESPONSE TIME Step Change 150 ms for 99% of final value ACCURACY ±0.1% of span or 0.02 ohms, whichever is greater

LINEARITY (Pt RTD, output vs. temp) ±0.03% of span (fullscale temp < 400°C) ±0.075% of span (fullscale temp > 400°C) (Others, output vs. resistance) ±0.01% of span COMMON MODE REJECTION 120 dB, DC to 60 Hz OPERATING TEMPERATURE -13°F to 176°F / -25°C to 80°C TEMPERATURE STABILITY ±0.02% of span per °C POWER 10 to 36 VDC, polarity-protected SUPPLY VOLTAGE EFFECT 0.02% of span max, 10 to 36 V