P8170 Danaher
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The Danaher P8170 is a valve motor drive controller in the Thermal Controllers series. It features a front size of 96 by 48 mm, a mounting depth of 100 mm, and panel sealing rated at IP66/NEMA4X. The controller offers 2 process alarms, a sample rate of 4 samples per second, and supports relay outputs with a rating of 2 Amps at 240 VAC.
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Product Description:
The P8170 is a valve motor drive thermal controller manufactured by Danaher within the Thermal Controllers series. It is intended for automated temperature regulation in ovens, baths, and HVAC mixing stations where a proportional or floating valve must be positioned instead of switching a heater on and off. By combining sensor feedback with its internal control algorithm, the device modulates a small AC motor to keep the process at the desired set point.
The instrument uses the 1/8 DIN format, presenting a faceplate that measures 96 × 48 mm for installation with standard panel hardware. Behind the bezel, it requires only 100 mm of clearance, so shallow cabinets can accommodate the controller. A rectangular 92 × 45 mm opening is sufficient for insertion, and once the clamps are tightened, the front provides IP66 / NEMA 4X protection against dust and water jets. Internally, the controller can deliver a direct-drive output of up to 120 VAC to a shaded-pole valve motor or supply a solid-state relay drive of 10 V at 20 mA when an external power block is preferred. Two process alarms are available, each selectable for high, low, or deviation modes. An SPDT mechanical relay rated at 2 A and 240 VAC provides additional control or fault signaling.
The analog 0–10 V input presents an impedance of 47 kΩ, while the 4–20 mA input loads the transmitter with only 5 Ω, minimizing voltage drop across long field cables. A digital command is accepted after a 0.25 s debounce interval, guarding against contact bounce. The microprocessor samples the selected input at 4 samples/s, so loop calculations remain synchronized with moderate-speed thermal processes. These input signals feed the valve motor control algorithm, which energizes the solid-state relay port or panel relay according to the selected proportional, integral, and derivative parameters. The two alarms can latch or track independently of the main control loop. This arrangement allows the alarm outputs to respond to process conditions without interrupting the primary valve positioning function.
