Thermocouple,Input,Process,Indicator,Model DIS974,Wilkerson Instrument

Thermocouple Input Process Indicator Model DIS974


CONNECTIONS

Output - (Optional)
Output + (Optional)
NC
Input +
Input -
Shield
Alarm 1 NC (Optional)
Alarm 1 C (Optional)
Alarm 1 NO (Optional)
Alarm 2 NC (Optional)
Alarm 2 C (Optional)
Alarm 2 NO (Optional)
Power AC L1
Power AC L2
(Terminal Labeled)

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Thermocouple,Input,Process,Indicator,Model DIS974,Wilkerson Instrument

Thermocouple,Input,Process,Indicator,Model DIS974,Wilkerson Instrument Catalogue
Thermocouple,Input,Process,Indicator,Model DIS974,Wilkerson Instrument Manual


Thermocouple,Input,Process,Indicator,Model DIS974,Wilkerson Instrument


Features

Thermocouple,Input,Process,Indicator,Model DIS974,Wilkerson Instrument Provides 4 1/2 Digit Display, Red or Green LEDs
Thermocouple,Input,Process,Indicator,Model DIS974,Wilkerson Instrument Display Calibrated in Engineering Units (C,F,K, etc.) Proportional to any Thermocouple Output
Thermocouple,Input,Process,Indicator,Model DIS974,Wilkerson Instrument Input Cold Junction Compensated
Thermocouple,Input,Process,Indicator,Model DIS974,Wilkerson Instrument Fully Isolated Output and/or 0, 1, or 2 Alarms (Optional)
Thermocouple,Input,Process,Indicator,Model DIS974,Wilkerson Instrument Alarm Setpoints Adjustable Without Disturbing Transmitter Output
Thermocouple,Input,Process,Indicator,Model DIS974,Wilkerson Instrument Fail-Safe Alarm Operation
Thermocouple,Input,Process,Indicator,Model DIS974,Wilkerson Instrument LED Alarm Status Indicator
Thermocouple,Input,Process,Indicator,Model DIS974,Wilkerson Instrument Adjustable Deadband
Thermocouple,Input,Process,Indicator,Model DIS974,Wilkerson Instrument 4 mV Minimum Input Span
Thermocouple,Input,Process,Indicator,Model DIS974,Wilkerson Instrument Unlimited* Choice of Input/Output Ranges
Thermocouple,Input,Process,Indicator,Model DIS974,Wilkerson Instrument Upscale Burnout Protection (Downscale Available)
Thermocouple,Input,Process,Indicator,Model DIS974,Wilkerson Instrument Analog and Digital Linearization Options Available
Thermocouple,Input,Process,Indicator,Model DIS974,Wilkerson Instrument Fits Standard 1/8 DIN cutout
Thermocouple,Input,Process,Indicator,Model DIS974,Wilkerson Instrument Rated NEMA-4X, Splashproof and Corrosion Resistant When Properly Installed
Thermocouple,Input,Process,Indicator,Model DIS974,Wilkerson Instrument 5 + 5 Year Warranty


Description

The DIS974 provides a display, optional isolated DC output voltage or current proportional to any thermocouple input signal, and optional alarm setpoints.  The units include filtering and conditioning to reduce susceptibility to transients and noisy operations.  The digital display utilizes an auto-zero dual-slope integrating A/D converter for accuracy and stability.

All controls are accessible by removing the gasketed front access panel.  The display controls are wide ranging so that they can be calibrated to display engineering units.  Decimal point selection is made with a switch, also accessible from the front.  A complete set of engineering unit labels is sent with each DIS.  Once the display has been adjusted to read the correct engineering units, the alarm setpoints can be adjusted without test equipment and without disturbing the output voltage or current.

Either setpoint may be displayed by use of the SP CAL switch. Each setpoint has an LED to indicate alarm status.  The alarms have adjustable deadbands.  Terminations are made to a screw terminal connector on the rear of the case.

Upscale burnout protection is provided as standard.  In the event the thermocouple opens, the unit responds as thought the input is offscale high.  Option B provides downscale burnout protection (unit responds as though the input is low).

The standard DIS874 and DIS974 provide thermocouple linearization using analog circuitry, which has certain limitations.  Analog linearization specifications are summarized in Table 1.  Option LL, digital linearization, provides superior performance as listed under the specifications.

Typical Applications

Temperature indication, monitoring, control, data acquisition, HI/LO control, etc.

Mounting

The DIS is designed to be mounted from the front of a panel through a standard horizontal 3.62 x 1.77 inches (1/8 DIN) cutout.  Two mounting cam-screws secure the DIS to the panel.

Specifications

INPUT RANGE
select any type thermocouple
  (minimum span 4 mV)

OUTPUT RANGE
Voltage
  select any range between 10 V
    10 mA max load
    (min span 0.2 V)
Current
  select any range from 0 to 20 mA max
    24 V compliance**
    (min span 1 mA)

OPEN SENSOR OUTPUT
>= full scale

RELAY CONTACTS (spdt)
Resistive Load:
  5 A max, 150 W max,
  240 VAC max, 30 VDC max
Inductive Load:
  1/8 HP max at 120/240 VAC

SETPOINT
each alarm 0 to 100% of span

DEADBAND
0.25% to 100% of span

RESPONSE TIME
<= 100 ms
  (range dependent)

ISOLATION
Output/Input
  >500 megohms
Breakdown Voltage
  >600 VAC rms

POWER
115 VAC 10%, 50/60 Hz
  (4 W max)
230 VAC 10%, 50/60 Hz
  (4 W max)

DISPLAY
Digit Size
  .56 inch LED, 4 1/2 digits, 19999

Decimal Point
  1.9.9.9.9

Control Range
  Zero
    19999
  Span
    min span 10
    max span 20000

Display Update
  3/sec

ACCURACY
0.1% of span

LINEARITY
Standard
  See Standard Linearization Tables Below

Option LL 
  2C (3.6F) or better
  0.05C (0.9F) for types 
  J, K, T, E or N if range is
  between -200 and +200C
    (-328 and +392F)

OUTPUT RIPPLE
<0.1% of span
  (peak to peak)

COMMON MODE REJECTION
120 dB, DC to 60 Hz

OPERATING TEMPERATURE
 14F to 140F
-10C to 60C

TEMPERATURE STABILITY
(0.02% of span +30 V)/C max


STANDARD LINEARIZATION ACCURACY, BASE-METAL THERMOCOUPLES
ZERO-BASED RANGES LOW-TEMP RANGES 
(HIGH END 0C)
T/C
TYPE
LIMIT FOR
1% OF SPAN
LIMIT FOR
2% OF SPAN
LIMIT FOR
0.5% OF SPAN
E 0/500C
32/932F
0/1000C
32/1832F
-100/0C
-148/32F
J 0/1000C
32/1832F
0/1200C
32/2192F
-100/0C
-148/32F
K 0/800C
32/1472F
  -100/0C
-148/32F
Cannot Linearize Type K Above 800C (1472F) See Option LL above
N O/500C
32/932F
0/1200C
32/2192F
-100/0C
-148/32F
T 0/400C
0/752F
0/400C
0/752F
-100/0C
-148/32F

STANDARD LINEARIZATION ACCURACY, PLATINUM THERMOCOUPLES
 T/C
TYPE
ZERO-BASED RANGES ELEVATED-ZERO RANGES
B -N.A.- 3% of span for 
500/1820C (932/3308F)
1.5% of span for
800/1820C (1472/3308F)
R 2.5% of span or better,
any zero-based range
1.5% of span or better, any
range starting above 200C (392F)
S 2.5% of span or better,
any zero-based range
1.5% of span or better, any
range starting above 200C (392F)

       
* Within specified range limits.

** Compliance:  The sum of the voltage drops in the output loop cannot exceed 24 V at rated current 
    (1200 ohms at 20 mA).