Series-32A

Supported Applications

The Dwyer Series 32A is a compact, microprocessor-based temperature and process controller designed for panel mounting in industrial automation environments. As the world's first dual display 1/32 DIN temperature/process controller, it supports universal input selection including thermocouple, RTD, DC voltage, or DC current signals.

Key functional capabilities documented for this series include:

• Dual Display Operation: Simultaneous display of Process Value (PV) and Setpoint (SV).
• Advanced Control Logic: Self-tune, fuzzy logic control algorithms.
• Ramp/Soak Profiles: 16-segment ramp/soak function for precise thermal cycling.
• Status Indication: Peak and valley indication with percent output display.

Operating Conditions & Performance

The Series 32A operates within an ambient temperature range of 14 to 131°F (-10 to 55°C). The unit features a front panel rating of NEMA 4X (IP66), providing protection against dust and water ingress. Power consumption is rated at 5 VA maximum.

Performance specifications for the series include:

• Accuracy: ±0.25% of span, ±1 least significant digit.
• Display Resolution: Two 4-digit, 7-segment LEDs with a height of 0.259 in (6.35 mm).
• Memory Backup: Nonvolatile memory requiring no batteries.

The controller incorporates loop break protection and four password-protected security levels to safeguard configuration parameters.

Control Output Ratings

• Relay (SPST): 3A @ 240 VAC resistive; 1.5A @ 240 VAC inductive. Pilot duty rating: 250 VA, 2A @ 120 VAC or 1A @ 240 VAC.
• Switched Voltage (Non-isolated): 5 VDC @ 20 mA.
• Proportional Current: 0 to 20 mADC, scaleable into a maximum of 600 Ohms load resistance.

Power Supply Options

• Standard Input: 100 to 240 VAC nominal (+10% -15%), 50 to 400 Hz single phase; or 132 to 240 VDC nominal (+10% -20%).
• Option 9502: Low voltage input of 12-24 VDC/VAC, 50-400Hz.

Physical Dimensions & Installation

The unit weighs 4 oz (114 g). The required panel cut-out is 1.772 x 0.874 in [45 x 22 mm], with a maximum supported panel thickness of 0.25 in [6.35 mm].

Configuration Options

The Series 32A is available in multiple configurations defined by alarm programming and output combinations. The model number structure follows the format: `32A<MODEL>` (e.g., 32A020, 32A123, 32A153). Available variants include:

• No Alarm / Single Output: Models such as 32A020 (5 VDC), 32A050 (Current), and 32A030 (Relay).
• Alarm / Dual Output: Models such as 32A123 (5 VDC + Relay) and 32A133 (Dual Relay).
• Alarm / Current & Relay: Model 32A153.

The series supports optional RS-485 serial communication (-992) for remote reading and writing of control parameters. Accessories include the MN-1 Mini-Node™ USB/RS-485 converter, LoveLinks III configuration software, and A-600 R/C snubber.

Snubber Protection (Relay Outputs)

To protect relay output devices from electrical noise generated by contactors or solenoids, the series documentation recommends using a snubber. The general purpose snubber part number is 541-0014. Alternatively, a custom assembly may be constructed using a 0.5 µF capacitor (600V) in series with a 100 Ω resistor (1/4 W), connected as close to the coil terminals as possible.

Key Product Differences

Variants within the Series 32A differ primarily by their alarm capability and output signal configuration. The standard model selection table defines six distinct configurations:

• Model 32A020: No Alarm, Output A = 5 VDC, Output B = None.
• Model 32A123: Yes (Alarm), Output A = 5 VDC, Output B = Relay.
• Model 32A133: Yes (Alarm), Output A = Relay, Output B = Relay.
• Model 32A153: Yes (Alarm), Output A = Current, Output B = Relay.
• Model 32A050: No Alarm, Output A = Current, Output B = None.
• Model 32A030: No Alarm, Output A = Relay, Output B = None.

The series also offers an optional low-voltage power supply (-9502) and RS-485 communication (-992). Note that only Option 9502 may be combined with another option; no other options are combinable.