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产品名称：PD178系列温度和工艺过程监测报警系统
产品型号：PDS178: Temperature & Process Scanning & Alarm Sy
产品厂商：PRECISION
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简单介绍：

We packaged our most popular PD138 product combination for you at a significant savings vs. buying these components separately. The PDS178 is a kit that includes a PD765-6R2-00 Trident and PD138 MINIM

详情介绍：

The MINIMUX II is a microprocessor-based eight channel analog input scanner/multiplexer and annunciator

PDS178

PDS178X2

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Kit includes

PD138-3 Minimux II Scanner
PD765-6R2-00 or PD765-6X2-00 Trident Meter
PDA2821 Plastic NEMA 4X Enclosure

Component Features

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

Component Features (cont.)

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

Plastic NEMA 4X Enclosure

NEMA 1, 4, 4X, 6, 12, and 13, IP66
Wall Mountable

SCAN 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.

APPLICATION

Using the PDS178 to scan Thermocouples

In the following application example, four oven thermocouples are scanned and channeled to a PD765 Temperature Meter where the PV is displayed and checked for low or high alarm conditions. All four ovens share the same low and high alarms, so the alarm inputs are joined together on the PD138

The PD138 MINIMUX II is programmed in the following manner to satisfy this application:

Select alarm Sequence A
Stop-on-alarm is off
Program dwell times:
- Channel 1 for ten seconds
- Channel 2 for five seconds
- Channel 3 for fifteen seconds
- Channel 4 for five seconds
- Channels 5-8 are disabled

The PD765-6R2-00 Trident is programmed in the following manner to satisfy this level application:

Select T/C
Select °F
Program alarm set and reset points:

The Minimux II scans each input and reflects the alarm state. The PD138 shown above is scanning channel 1 (Green LED) allowing the Trident to display the current temperature of 250°. No alarm is present since the temperature is within limits. The Minimux II only responds to new alarm conditions detected in the currently active channel. The PD138 also avoids false alarms by detecting alarm conditions only after dwelling on a channel for 2 seconds, or 0.05 seconds before it has been programmed to go onto the next channel if the dwell time had been programmed for less than 2 seconds. This gives the PD765 time to stabilize and accurately display the temperature and to check for alarm conditions.

PD765-6R2 Trident alarm set and reset points

The Minimux II switches to (scans) input 2, channeling it to the PD765-6R2-00 where a temperature of 345° triggers a high alarm condition. The PD138 is programmed for Sequence A, so the channel 2 LED alternately flashes yellow and green, the internal horn sounds, and the PD138’s alarm relay transfers causing an external horn to sound. After acknowledging the alarm the channel LED will glow a steady yellow (while selected), or steady red (when not selected) until reset.

The Minimux II switches to (scans) input 3, channeling it to the PD765-6R2-00 where a temperature of 220° is found to cause a low alarm condition 2 seconds into the dwell time. Channel 3 LED alternately flashes yellow and green (shown yellow), the internal horn sounds and the PD138's alarm relay transfers causing an external horn to sound.

SIGNAL CONNECTIONS

This example shows 3 type J thermocouples multiplexed into 1 temperature meter

Thermocouple Inputs

The example shown below has 3 type J thermocouples multiplexed by the PD138 into the PD765. Thermocouple wire must also be used between the PD138 and the PD765. The PD765 also accepts 100 Ω Platinum RTD sensors and process inputs.

SPECIFICATIONS

Except where noted all specifications apply to operation at +25°C

The partial list of specifications shown below are key to the PDS178 system. For complete specifications on both the PD138 Minimux II and the PD765 Trident, see the listed Documentation for more information.

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
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: 0.56" (14 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)

ORDERING INFORMATION Products
Model		Description
PDS178		Watchdog Scanner Kits contains the following: • One (1) PD765-6R2-00 Trident Temperature Meter; 2 Relays; Powered from 85-265 VAC • One (1) PD138-3 MINIMUX II Scanner • One (1) P
PDS178X2		Watchdog Scanner Kits contains the following: • One (1) PD765-6X2-00 Trident X2 Temperature Meter; 2 Relays; Powered from 85-265 VAC • One (1) PD138-3 MINIMUX II Scanner • One (1)

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产品名称：PD178系列温度和工艺过程监测报警系统