WILKERSON INSTRUMENT CO., INC.

DIS874 Thermocouple Input Process Indicator
3.5 Digit Display With Optional Alarms
and Re-Transmit Output

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DIS874

DIS874
Thermocouple Input
Process Indicator
3.5 Digit Display
With Optional Alarms
and Re-Transmit Output

$463.00

The following information must be entered to complete your order:
See "Specifications" below for Input, Output and Display range limits.

Power:

Input:
Zero Scale
Full Scale
Units
  Thermocouple Type
Display: Zero Scale
Full Scale
Units (Optional)
  Display Action
Alarms: Alarm Option
Output: Output Action
(If Output Option
Selected, Enter
Output Values)
Zero Scale
Full Scale
Units

Quantity:

 

  • Features
  • Description
  • Specifications
  • Dimensions
  • Connections
  • Display Calibrated in Engineering Units (°C, °F, °K, etc.)
  • Proportional to any Thermocouple
  • Input Cold Junction Compensated
  • Fully Isolated Output and/or 0, 1, or 2 Alarms (Optional)
  • Alarm Setpoints Adjustable without Disturbing Transmitter Output
  • Fail-Safe Alarm Operation
  • LED Alarm Status Indicator
  • Adjustable Deadband
  • 5 mV Minimum Input Span
  • Unlimited Choice of Input / Output Ranges (Within specified range limits)
  • Upscale Burnout Protection (Downscale Available)
  • Analog and Digital Linearization Options Available
  • Fits Standard 1/8 DIN Cutout
  • Rated NEMA-4, Splashproof when Properly Installed
  • 5 Year Warranty

The DIS874 provides a display, optional isolated DC output voltage or current proportional to any thermocouple input signal, and optional alarm setpoints. All Wilkerson products are designed with RFI filters and lightning protection to reduce susceptibility to electrical noise and damage by lightning. 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 behaves as though the input goes offscale high. Option B provides downscale burnout protection (unit behaves as though the input goes low).

Standard DIS874 and DIS974 provide thermocouple linearization using analog circuitry, which has certain limitations. Its 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.

INPUT RANGE
select any type thermocouple (minimum span 5 mV)

OPTIONS SA, DA SETPOINT
each alarm 0 to 100% of span

DEADBAND
0.25% to 100% of span

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

OPTION TX 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 (1200 ohms max at 20 mA)

OUTPUT RIPPLE
(Peak-to-Peak) <0.1% of span

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

RESPONSE TIME
(Range Dependent) <100 ms

OPEN SENSOR INDICATION
> full scale

ACCURACY
±0.1% of span at endpoints

LINEARITY
Standard - See Table Below

COMMON MODE REJECTION
120 dB, DC to 60 Hz

DISPLAY
Digit Size .56" LED, 3½ digits, ±1999
Decimal Point ±1.9.9.9
Control Range
Zero ±1999
Span min span 10/max span 2000

DISPLAY
Update 3/sec

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

TEMPERATURE STABILITY
±(0.02% of span + 1.3 μV)/°C max

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

 

DIS874/974 STANDARD LINEARIZATION ACCURACY, BASE-METAL THERMOCOUPLES

T/C
TYPE

ZERO BASED RANGES

LOW TEMP RANGES (HIGH END = 0°C)

LIMIT FOR
±1% OF SPAN

LIMIT FOR
±2% OF SPAN

LIMIT FOR
±5% OF SPAN

E

0/500°C 32/392°F

0/1000°C 32/1832°F

-100/0°C -148/32°F

J

0/1000°C 32/1832°F

0/1200°C 32/2192°F

-100/0°C -148/32°F

K

0/800°C 32/1472°F
Cannot linearize Type K Above 800°C (1472°F)

-100/0°C -148/32°F

N

0/500°C 32/932°F

0/1200°C 32/2192°F

-100/0°C -148/32°F

T

0/400°C 0/752°F

0/400°C 0/752°F

-100/0°C -148/32°F

DIS874 AND DIS974 LINEARIZATION ACCURACY, PLATINUM THERMOCOUPLES

T/C
TYPE

ZERO BASED RANGES

ELEVATED-ZERO RANGES

B

- N.A.-

±3% of span for 500/1820°C (932/3308°F)
±1.5% of span for 800/1820°C (1472/3308°F)

R & S

±2.5% of span or better, any zero-based range

±1.5% of span or better, any range starting above 200°C (392°F)

DIN Mod Series Dimension Drawing

Terminal 1
Terminal 2
Terminal 3
Terminal 4
Terminal 5
Terminal 6
Terminal 7
Terminal 8
Terminal 9
Terminal 10
Terminal 11
Terminal 12
Terminal 13
Terminal 14
Output -
Output +
No Connection
T/C Input +
T/C Input -
Shield (Common)
Alarm 1 NC
Alarm 1 C
Alarm 1 NO
Alarm 2 NC
Alarm 2 C
Alarm 2 NO
Power AC L1
Power AC L2
Specifications    Manual

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