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  • 产品名称：PD138系列温度和工艺过程扫描仪

  • 产品型号：PD138: Temperature and Process Scanner
  • 产品厂商：PRECISION
  • 产品价格：0
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简单介绍：
Description: Temperature & Process Scanner Inputs: TC, RTD, AC Volts, DC Volts Number of Inputs: 8 Inputs per Unit, Eliminates Need for 7 Displays Case: 1/8 DIN, High Impact Plastic, Shallow Depth
详情介绍：
The MINIMUX II is a microprocessor-based eight channel analog input scanner/multiplexer and annunciator

Features



  • 8 Inputs per Unit, Eliminates Need for 7 Displays
  • Unlimited Number of Units per System
  • Free Custom Message Labels
  • Thermocouples, RTDs, Process, AC & DC 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)
  • Non-Interruptible 4-20 mA Inputs
  • Sunlight Readable Indication
  • NEMA 4X/IP65 Front
     
  • Shallow Depth 1/8 DIN Enclosure
  • -40 to 65°C Operating Temperature Range


 

 

SCAN MOST SIGNALS/SENSORS

The MINIMUX® II is a microprocessor-based eight channel analog input scanner/multiplexer and annunciator that provides low-cost automatic switching for multi-point display and alarm systems. Each MINIMUX® II can automatically switch up to eight inputs to another device such as a digital panel meter, controller, or PLC. Signal switching is done via reed relays making the MINIMUX® II ideal for switching thermocouples, RTDs, control loops, and AC & DC signals.  

USES FOR MINIMUX® II

Automatic Switching

In its most basic form, the PD138 is the electrical equivalent of a double-pole, eight position automatic switch. Whatever input is brought into the PD138 is dwelled on for a certain amount of time while being channeled/switched out to another device. For example, a typical application may involve channeling/switching eight type J thermocouples into a single digital panel meter.

Temperature Scanning

One of the most popular uses for the PD138 is temperature monitoring, especially the monitoring of bearing and stator winding temperatures. Any of the many different style thermocouples, RTDs, or thermistors can be used with the PD138 - right out of the box.

Automatic or Manual Scan

The PD138 automatically scans through each active channel, dwells on that channel for an independently programmed dwell time, while at the same time switching the signal to an external device. The scanning can be stopped, or scanned manually via the front panel stop/go pushbutton.

Alarm Annunciator

One of the key features of the PD138 is its ability to indicate and process alarms that are generated by an external device. Each channel of the MINIMUX® II has an independent ‘Alarm-in’ terminal that allows an external device to trigger an alarm on the MINIMUX® II. The external device may be the relays on a digital panel meter, such as the PD765, or the digital output from a PLC.

First-Out (Sequence F2A)

The PD138 can be configured to recognize first-out alarms. On the PD138, these are one or more alarms that occur during the first complete scan where an alarm is present on one or more channels.

 

FRONT PANEL

Microprocessor-based eight channel analog input scanner/multiplexer and annunciator LED panel

Self Test

When the PD138 is powered, the LEDs are turned on one channel at a time until all green and then all red LEDs have been tested. The internal horn will sound at the end of the LED test.  

APPLICATION

PD138 and PD765 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:
PD765-6R2 Trident alarm set and reset points
The MINIMUX® II scans each input and reflects the alarm state. The PD138 shown above is scanning input 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° is found to cause 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


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

Three-Wire RTD Inputs

Three-wire inputs such as thermistors and RTDs can be handled by switching the two common wires and connecting the third wire of each sensor to the RTD-TP terminal and to the temperature meter

  • Connect like color leads to terminals 1A & 1B, 2A & 2B, 3A & 3B, etc
  • Connect odd color leads to terminal TP
  • Connect outputs A, B and TP to the temperature meter

     
The example below shows three 3-wire RTDs multiplexed into 1 temperature meter
three 3-wire RTDs multiplexed into 1 temperature meter


Thermocouple Inputs

Thermocouple wire must be used between the MINIMUX® II and the meter. This example shows 3 type J thermocouples multiplexed into 1 temperature meter
This example shows 3 type J thermocouples multiplexed into 1 temperature meter


4-20 mA Inputs

A special version of the MINIMUX® II is used to switch 4-20 mA signals. The PD138-X-CL (X = power), has a built-in resistor network that eliminates loop interruptions. The process meter must be setup for 1-5 V input and the complete system should be calibrated together
Temperature and Scanner used with 4-20 mA eliminate interruptions


The PD6000's internal transmitter power supply may be used to power the transmitters. However, only the transmitter that is currently selected will be powered and all others will not be powered. Care should be taken to provide the transmitter with sufficient time to stabilize to provide an accurate output

PD6000’s internal transmitter power supply may be used to power the transmitter


 

MULTIPLE PD138 CONNECTIONS

Multiple MINIMUX® II can be connected together to increase multiplexing capacity for an unlimited number of points. When connecting several units together, one unit of the group is designated the master unit and all other units function as follower units. Multiple unit configuration is simply done by connecting the units together as shown below. The system will self-determine if there are two or more MINIMUX® II connected together

Master/Follower Connections

Power supply PB/PC PD PL PX terminal connections


Multiplexer output signal connections

Power Supply PF PM terminal connections


 

Silence, Acknowledge, & Stop/Go Connections

Silence, Acknowledge, & Stop/Go Connections


 
 

ALARM-IN CONNECTIONS

Each channel on the PD138 has its own Alarm-In line that provides independent alarm indication capability for each channel. The alarm input lines of the PD138 are normally high (pull-up to 5V). Relay contacts from a Precision Digital meter or a low level logic output from a PLC can be used to drive the PD138 alarm input lines>


ALARM-IN CONNECTIONS


 
 

PDS178 TEMPERATURE & PROCESS SCANNING & ALARM SYSTEM

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 MINIMUX® II in a PDA2821 NEMA 4X enclosure. The PDS178 is a Temperature or Process Scanning and Alarm System ready to wire into your application. You can’t beat the discounted package price!

 
TEMPERATURE & PROCESS SCANNING ALARM SYSTEM - PDS178


 
View the Vigilante Video Click here to see the
Minimux Application
video
Kit Components
PD765-6R2-00 Process & Temperature Meter with 2 Relays
PD138-3 MINIMUX® II 115 VAC Power
PDA2821 Plastic NEMA 4X Enclosure

For more information on the PDS178, click here


 
 

MOUNTING DIMENSIONS

Scanner and Temperature meter MOUNTING DIMENSIONS


 

CONNECTIONS

Scanner and Temperature meter Connections


 
 

SPECIFICATIONS

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

General

Number Of Channels: 8 double-pole channels per unit
Number Of Channels Per System: Unlimited
Signals Switching: DPST reed relays
Contact Resistance: 0.2 Ω maximum
Maximum Input Voltage: 200 V (switched or common mode)
Maximum Current Switched: 0.5 A
Maximum Power Switched: 10 W
Dwell Time: Each channel adjustable from 0.6 to 30 seconds
Non-Volatile Memory: All programming values are stored in non-volatile memory for ten years if power is lost
Scan Method: Internal or manually controlled
Channel Indication: Green LED on front panel
Disabling Channels: Any channel may be disabled during setup
Scan Stop: The scan may be stopped by pressing and holding the STOP/GO button for more than 0.5 seconds. The scan may be resumed by pressing and releasing the STOP/GO button quickly (less than 0.5 seconds)
Alarm Input: Independent alarm input for each channel. Input Impedance; 25 K Ω, typical pull-up to 5 V
Alarm Sequence: Sequence A or Sequence F2A (first out)
Alarm Outputs: Alarm condition indicated by:
   1. Front panel red LED for each channel
   2. Relay, 1 SPDT (form C); rated 2 Amp @ 30 VDC or 2 Amp 2. @ 250 VAC resistive load; 1/14 HP @ 125 /    250 VAC for inductive loads. For fail-safe operation, the relay is energized in the non-alarm state. In the case of a    power failure, the relay will go to the alarm state, (NC contact is connected to common)
   3. Built-in Horn, 85 dB
   4. Stop-on-alarmed-channel (user select)
Alarm Acknowledge: Front panel ACK and rear connector terminals
External Switch Functions: The functions of the front panel buttons are available at screw terminals at the rear of the instrument
Message Labels: Free, custom printed, 2 lines per message at 14 characters per line. Factory or field printable. See manual for details
Connections: Removable screw terminal connectors provided:
Power + Relay: 22 to 12 AWG; Alarm Input, Analog Signal, External Switches, I/O: 30 to 16 AWG
Operating Temperature: -40°C to 65°C
Storage Temperature: -40°C to 85°C
Relative Humidity: 0 to 95% non-condensing
Power Options: 115 VAC, ± 10%, 50/60 Hz, 4 VA; 230 VAC, ± 10%, 50/60 Hz, 4 VA; 12-24 VDC (9-18 VAC, 50/60 Hz) 2 W
Led Test: All LEDs are tested on power-up
Enclosure: 1/8 DIN, high impact plastic, UL94V-0
Front Panel: NEMA 4X, panel gasket provided
Warranty: 3 years parts & labor

 
Systems
Model Kit Components Price
PDS178 PD765-6R2-00 Process & Temperature Meter $599
PD138-3 MINIMUX® II
PDA2821 Plastic NEMA 4X Enclosure, 1 Vertical &; 1 Horizontal


 
 

ORDERING INFORMATION

Products


 
Model Description  

QuickShip Program Eligible Product Blue dot denotes item as a Quick Ship product

 
PD138-2        Minimux 8-Channel Temperature and Process Scanner; Powered from 24 VDC         
PD138-2-CL        Minimux 8-Channel Temperature and Process Scanner with Loop Resistor; Powered from 24 VDC         
PD138-3        Minimux 8-Channel Temperature and Process Scanner; Powered from 115 VAC         
PD138-3-CL        Minimux 8-Channel Temperature and Process Scanner with Loop Resistor; Powered from 115 VAC         
PD138-4        Minimux 8-Channel Temperature and Process Scanner; Powered from 230 VAC         
PD138-4-CL        Minimux 8-Channel Temperature and Process Scanner with Loop Resistor; Powered from 230 VAC         
  

Enclosures


 
Model Description  
PDA2301-V        Economical Plastic NEMA 4X Vertical Enclosure for 1 Vigilante II Alarm Annunciator or Minimux® II Scanner         
PDA2302-V        Economical Plastic NEMA 4X Vertical Enclosure for 2 Vigilante II Alarm Annunciators or Minimux® II Scanner         
PDA2303-V        Economical Plastic NEMA 4X Vertical Enclosure for 3 Vigilante II Alarm Annunciators or Minimux® II Scanner         
PDA2304-V        Economical Plastic NEMA 4X Vertical Enclosure for 4 Vigilante II Alarm Annunciators or Minimux® II Scanner         
PDA2305-V        Economical Plastic NEMA 4X Vertical Enclosure for 5 Vigilante II Alarm Annunciators or Minimux® II Scanner         
PDA2306-V        Economical Plastic NEMA 4X Vertical Enclosure for 6 Vigilante II Alarm Annunciators or Minimux® II Scanner         
PDA2322        Economical Plastic NEMA 4X Enclosure for 1 Type D + 1 Type C Meter         
PDA2411        Plastic NEMA 4X Enclosure for 2 Meter (Any Type)         
PDA2414        Plastic NEMA 4X Enclosure for 1 Type D + 1 Type A, B, C or E Meter         
PDA2501-V        Plastic NEMA 4X Vertical Enclosure for 1 Vigilante II Alarm Annunciator or Minimux® II Scanner         
PDA2502-V        Plastic NEMA 4X Vertical Enclosure for 2 Vigilante II Alarm Annunciators or Minimux® II Scanners         
PDA2503-V        Plastic NEMA 4X Vertical Enclosure for 3 Vigilante II Alarm Annunciators or Minimux® II Scanners         
PDA2504-V        Plastic NEMA 4X Vertical Enclosure for 4 Vigilante II Alarm Annunciators or Minimux® II Scanners         
PDA2505-V        Plastic NEMA 4X Vertical Enclosure for 5 Vigilante II Alarm Annunciator or Minimux® II Scanners         
PDA2506-V        Plastic NEMA 4X Vertical Enclosure for 6 Vigilante II Alarm Annunciator or Minimux® II Scanners         
PDA2522        Plastic NEMA 4X Enclosure for 1 Type D + 1 Type C Meter         
PDA2601-V        Stainless Steel NEMA 4X Vertical Enclosure for 1 Vigilante II Alarm Annunciator or Minimux® II Scanner         
PDA2602-V        Stainless Steel NEMA 4X Vertical Enclosure for 2 Vigilante II Alarm Annunciators or Minimux® II Scanners         
PDA2603-V        Stainless Steel NEMA 4X Vertical Enclosure for 3 Vigilante II Alarm Annunciators or Minimux® II Scanners         
PDA2604-V        Stainless Steel NEMA 4X Vertical Enclosure for 4 Vigilante II Alarm Annunciators or Minimux® II Scanners         
PDA2605-V        Stainless Steel NEMA 4X Vertical Enclosure for 5 Vigilante II Alarm Annunciators or Minimux® II Scanners         
PDA2606-V        Stainless Steel NEMA 4X Vertical Enclosure for 6 Vigilante II Alarm Annunciators or Minimux® II Scanners         
PDA2622        Stainless Steel NEMA 4X Enclosure for 1 Type D + 1 Type C Meter         
PDA2701-V        Steel NEMA 4X Enclosure for Vertical Enclosure for 1 Vigilante II Alarm Annunciator or Minimux® II Scanner         
PDA2702-V        Steel NEMA 4X Enclosure for Vertical Enclosure for 2 Vigilante II Alarm Annunciators or Minimux® II Scanners         
PDA2703-V        Steel NEMA 4X Enclosure for Vertical Enclosure for 3 Vigilante II Alarm Annunciators or Minimux® II Scanners         
PDA2704-V        Steel NEMA 4X Enclosure for Vertical Enclosure for 4 Vigilante II Alarm Annunciators or Minimux® II Scanners         
PDA2705-V        Steel NEMA 4X Enclosure for Vertical Enclosure for 5 Vigilante II Alarm Annunciators or Minimux® II Scanners         
PDA2706-V        Steel NEMA 4X Enclosure for Vertical Enclosure for 6 Vigilante II Alarm Annunciators or Minimux® II Scanners         
PDA2722        Steel NEMA 4X Enclosure for 1 Type D + 1 Type C Meter         
PDA2801QuickShip Program Eligible Product        Low-Cost Plastic NEMA 4X Enclosure for 1 Type C Meter         
PDA2811        Low-Cost Plastic NEMA 4X Enclosure for 1 Meter (Type A, B, C or E)         
PDA2812        Low-Cost Plastic NEMA 4X Enclosure for 2 Meters (Any type)         
PDA2821        Low-Cost Plastic NEMA 4X Enclosure for 1 Type D Meter + 1 Type A, B, C or E Meter
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