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Precision Digital PDS178 Watchdog temperature Scanning & alarm Systems

Watchdog temperature Scanning & alarm Systems

Scans most Signals/Sensors The Watchdog Temperature Scanning & Alarm System brings together a popular combination of Precision Digital products: the Trident meter, the Minimux II Scanner, and a PDA2821 NEMA 4X enclosure.

The scanner provides low-cost automatic switching for multipoint display and alarms. Signal switching is done via reed relays making the Watchdog (as configured) ideal for switching up to eight thermocouple or RTD inputs. The Watchdog can be used in a variety of temperature monitoring applications. A very common application for this system is to monitor bearing temperatures (as shown above).

Because of the popularity of this combination, we can offer this system at a price significantly below what it would cost to buy these components separately

PD765-6R2-00 & PD765-6X2-00 Trident Temperature & Process Meter
• 4-20 mA, ±10 V, TC & RTD inputs
• 4-digit display
• Two relays for alarm Signal to PD138
• NEMA 4X, IP65 Front
• Sunlight readable display

PD138-3 Minimux® II Temperature / Process Scanner
• 8 inputs per unit
• Thermocouples, RTDs, and process inputs
• Adjustable dwell time for each channel
• Independent alarm input for each channel
• First-out alarm indication
• Alarms indicated by LEDs, Built-in horn, and relay
• Built-in 85 dB horn with Silence pushbutton
• Stop-on-alarmed channel (Field Select)
• Sunlight readable indication
• NEMA 4X/IP65 Front

PDA2821 plastic NEMA 4X Enclosure
• NEMA 1, 4, 4X, 6, 12, and 13, IP66
• Wall mountable

Select a link under the "item" tab below to order.

Cat #DescriptionsTypeKit Components
PDS178Temperature Scanning & Alarm SystemWatchdog Temperature Scanning and Alarm SystemPD765-6R2-00 PD138-3 PDA2821 Temp. Meter, 0.56” Display Minimux II Scanner Plastic NEMA 4X Enclosure
PDS178X2Temperature Scanning & Alarm System with Large DisplayWatchdog Temperature Scanning and Alarm SystemPD765-6X2-00 PD138-3 PDA2821 Temp. Meter, 1.20” Display Minimux II Scanner Plastic NEMA 4X Enclosure
Input Channels: Up to 8 channels
Signal Switching: DPST relays
Contact Resistance: 0.2 Ω maximum
Dwell Time: Each channel adjustable from 0.6 to 30 seconds
Scan Stop: Hold STOP/GO button for 0.5 seconds
Alarm Acknowledge: Front panel ACK button
PD138 Message labels: Free, custom printed. See PD138 manual
for complete details.
Alarm output: Relay, 1 SPDT rated 2 Amp @ 30 VDC or 250 VAC
Temperature Inputs: J, K, E, T thermocouples, 100 Ω platinum RTD
Digital Display: PDS178: 0.56" (14 mm) high, red LED, 4 digits.
PDS178X2: 1.20" (30 mm) high, red LED, 4 digits
Accuracy: Temperature ±1°C/±2°F, Process ±0.05% of span ±1count
Operating Temperature: 0 to 65°C
Storage Temperature: -40 to 85°C
Power: 115 VAC, ±10%, 50/60 Hz, 22 W max
Compliance: NEMA 4X
Enclosure Dimensions: 7.38" x 11.00" x 7.13" (H x W x D)

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