Precision Digital PDS178 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 # | Descriptions | Type | Kit Components |
| PDS178 | Temperature Scanning & Alarm System | Watchdog Temperature Scanning and Alarm System | PD765-6R2-00 PD138-3 PDA2821 Temp. Meter, 0.56” Display Minimux II Scanner Plastic NEMA 4X Enclosure |
| PDS178X2 | Temperature Scanning & Alarm System with Large Display | Watchdog Temperature Scanning and Alarm System | PD765-6X2-00 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) | ||
