Omega Products DP81C User Manual

Single- or Multi-Channel Digital
Process Indicators

For Panel or Benchtop Use

DP81 Series

Starts at

$

599

DP81T, $599,
shown smaller
than actual size.

Wireless

Conversion Receivers

Available. For Details

Visit omega.com/

mwtc-rec6

⻬ High Accuracy
⻬ 14 Thermocouple

Input Types

⻬ 6 RTD Inputs: 4 Platinum,

10 Ω Copper, and
120 Ω Nickel Types

⻬ Thermistor Inputs:

YSI 400 and 700 Series

⻬ Process Inputs:

4 Voltage and 2 Current

⻬ Modular Construction

Allows Options to Be
Field-Installed

⻬ Single- or Double-

Width

Panel

⻬ Multiple Inputs up to

24 Thermocouple
or 12 RTD Input

⻬ Latching or

Non-Latching Alarms

⻬ Isolated Analog Output
⻬ Fully Isolated RS232/

20 mA Digital Outputs

⻬ Math Expressions:

Display the Rate Change,
Max/Min or Timed
Average of Measurements

⻬ DC Power: Fully Isolated

12 or 24 Vdc Power Can
Be Used with Floating or
Grounded Sensors

The DP80 Series offers repeatability,
reliability, and compatibility with most
sensors. Temperature can be measured
from -273 to 2318°C (-460 to 4206°F),
or 0 to 2592 K, all with 0.1° resolution.
DC voltage can be measured to 1 µV
and ranges are available up to 100V.
Process voltage and current loops can
easily be scaled from the front panel,
within 99999 display counts. Strain­gage indicators measure load cells,
pressure, torque, thrust, and force with

0.01% precision. Whether you’re
measuring the temperature of molten
metal or testing jet

engine performance,
make your choice a DP80
Series digital indicator.

Convenience From the Front Panel

Just about everything can be done from
the front panel—even calibration. Simple
display instructions prompt you every
step of the way. Change sensor type
selection, change °F or °C, set alarm
points, or reset math options—from the
front panel. When an option is installed,
you’ll be prompted appropriately. Also,
all output options are fully isolated,
keeping unwanted ground loops from
affecting the instrument’s measuring
system. This further maintains the
instrument’s high accuracy and
increases your confidence in the
displayed value.

Unique Sensor Error Compensation

Compensate for sensor offset errors
such as those that commonly occur with
thermocouples. The DP80 Series
corrects offset errors inherent in
sensors, lead-wires, and deviations from
reference operating conditions. Use it to
optimize measuring systems at a single­measurement point, such as monitoring
a calibration bath.

Temperature Indicators

Thermocouple models accommodate
14 types of thermocouples (shown in the
range table). RTD models accommodate
6 types of RTD sensors, and thermistor
models accommodate both 400- and
700-type thermistors. They offer 0.1°
resolution with thermocouples and RTD
sensors and provide 0.01° to 0.02°
resolution for thermistors. The front
panel keypad is also used to select °F,
°C, or Kelvin display units and input
type. The DP80 Series can measure
and display 1 input point or, with the
multi-input option, as many as twenty­four inputs. The DP81 is a single-input
instrument for rack or panel mounting
and can accommodate up to 2 option
cards. The DP82 is an expanded,
double-width indicator that
accommodates up to 5 options. Both
are compatible with a wide selection
of temperature sensors.

DC Voltage Indicators

Functioning as a digital voltmeter,
the DP80 Series provides precision
measurement and display of dc
voltages. Four ranges, 100 mV, 1V,

M-65

KTSS-18G-12 molded
transition junction
probe, $19, sold
separately.
See page A-78.

10V, and 100V, are standard. Each
range is displayed to its highest
resolution within the full 99999 counts.
With 0.01% accuracy and 1-digit
repeatability, lab quality measurements
are possible with a panel mount or
benchtop indicator. For scaled DC
voltages, the DP80-SCL option can be
specified for use with models with V
input code (DC voltage input). All DC
input ranges shown in the DC voltage
range table can be scaled, offset, have
engineering units assigned, and have
decimal position changed (e.g., 1 to
5 Vdc input can be displayed as

200.0 and 750.0 psi).

Current Loop Indicators

The DP80 Series can accurately
measure and display process signals to
proportional engineering units. For
current loop measurements, models with
“C” input code (current input) allow
selection of either 4 to 20 mA or 10 to
50 mA. This input is pre-scaled and
displayed as 0.00 to 100.00%. To
display something other than 0 to 100%,
you can add the scaling and offset option
DP80-SCL. This option allows you to
scale the display within ±99999 counts,
change the engineering units, and
reposition the decimal point location
(e.g., 4 to 20 mA displayed as

0.00 to 560.0 gpm).

Strain Gage Indicators

The DP87 and DP88 Series of digital
strain gage indicators are compatible
with lower output-bonded foil-type
transducers and high-output semiconductor
transducers (up to 100 mV). Each
instrument allows selection from one of
4 full-scale voltage ranges to optimize
sensitivity. The measuring technique
used is a unique voltage-to-frequency

Thermocouple Input and Range Table

Input includes max
Code Sensor Type Range linearization error)

Iron- -336.0 to 2193.3°F 0.5°F
Constantan -204.4 to 1200.7°C 0.3°C

68.8 to 1473.9 K 0.3 K

CHROMEGA®– -299.9 to 2503.5 °F 0.6°F
ALOMEGA

Copper– -373.2 to 753.7°F 0.4°F
Constantan -225.1 to 400.9°C 0.2°C

CHROMEGA®– -358.6 to 1835.2°F 0.6°F
Constantan -217.0 to 1001.8°C 0.3°C

Platinum– 32.0 to 3219.1°F 1.2°F (above 79.0°F)
Pt13% Rhodium 0.0 to 1770.6°C 0.7°C (above 26.0°C)

Platinum– 32.0 to 3216.7°F 1.2°F (above 79.0°F)
Pt10% Rhodium 0.0 to 1769.3°C 0.7°C (above 26.0°C)

Pt30% Rhodium– 899.5 to 3309.6°F 2.0°F
Pt6% Rhodium 481.9 to 1820.9°C 1.1°C

T

Nicrosil– 32.0 to 2301.5°F 0.5°F
Nisil 0.0 to 1260.8°C 0.3°C

Tungsten 5% Re– -10 to 4200.4°F 1.1°F
Tungsten 26% Re -23.3 to 2315.8°C 0.6°C

Tungsten– 295.0 to 4206.0°F 1.1°F
Tungsten 26% Re 146.1 to 2318.9°C 0.6°C

W 3% Rhenium– -8.4 to 4203.8°F 1.1°F
W 25% Rhenium -22.4 to 2317.7°C 0.6°C

CHROMEGA
Gold .07% -273.4 to 7.2 °C 0.2°C
Atomic Iron 0.0 to 280.4K 0.2 K

Iron– -330.6 to 1654.7°F 0.9°F
Constantan -201.4 to 901.5°C 0.2°C

Copper– -331.3 to 1114.4°F 0.9°F
Constantan -201.8 to 601.3°C 0.5°C

Platinum 100 Ω at 0°C -332.3 to 1571.7°F 0.2°F
3- or 4-wire -202.4 to 855.4°C 0.1°C
␣ = 0.00385/ 70.8 to 1128.6 K 0.1K
DIN 43670 curve

Platinum 100 Ω at 0°C -401.0 to 1572.0°F 0.2°F
3- or 4-wire -240.6 to 855.4°C 0.1°C
␣ = 0.00392 32.6 to 1128.6 K 0.1K

Platinum 200 Ω at 0°C -330.1 to 1566.2°F 0.2°F
3- or 4-wire -201.2 to 852.3°C 0.1°C
␣ = 0.00392 72.0 to 1125.5 K 0.1K

R

Platinum 1000 Ω at 0°C
3- or 4-wire -204.4 to 1200.7°C 0.1°C
␣ =0.00375/HYCAL 68.8 to 1473.9 K 0.1K
Ultra 7 curve

Copper 10 Ω at 25°C -337.2 to 507.2°F 0.8°F
3- or 4-wire -205.1 to 264.0°C 0.4°C
per Minco table 16-9 68.1 to 537.2 K 0.4K

Nickel 120 Ω at 0°C -112.0 to 608.2°F 0.4°F
3- or 4-wire -80.5 to 320.1°C 0.2°C
per Minco table 7-120 192.7 to 593.3 K 0.2K

®

®

-184.4 to 1373.1°C 0.3°C

88.8 to 1646.3 K 0.3 K

48.1 to 674.1 K 0.2 K

56.2 to 1275.0 K 0.3 K

273.2 to 2043.8 K 0.7 K (above 299.2 K)

273.2 to 2042.5 K 0.7 K (above 299.2 K)

755.1 to 2094.1 K 1.1 K

273.2 to 1534.0 K 0.3 K

249.9 to 2589.0 K 0.6 K

419.3 to 2592.1 K 0.6 K

250.8 to 2590.9 K 0.6 K

-460.1 to 44.9°F 0.4°F

71.8 to 1174.7 K 0.5 K

71.4 to 874.5 K 0.5 K

-330.4 to 1025.6°F 0.2°F

Accuracy (all ±‚

M-66

Current Input Range Table

Input Input
Code Type Range Res.

4 to -5.00% to

20 mA 105.00% 0.01%

C

Note: Accuracy for voltage and current
inputs: 0.01% rdg ±1 digit.

Voltage Input and Range Table

Input Input
Code Type Range Res.

V

Thermistor and Range Table

Input Input
Code Type Range Acc. Res.

Y

Strain Gage Models
with Range Table

Model Input
No. Range Accuracy Res.

DP87 -15 to 1 µV/

DP88 -30 to 2 µV/

DP89 -75 to 5 µV/

10 to -15.00% to

50 mA 105.00% 0.01%

mVdc -15.000 to

99.999 mV 10 µV

mVdc -150.00 to

99.999 mV 100 µ

Vdc -1.5000 to

9.999 V 1 m

Vdc -15.000 to

99.999 V 10 mV

400 -42 to

Series 221°F 0.02°F 0.4°F
2252 Ω -42 to
@ 25°C 105°C 0.4°C 0.01°C

(77°F) 231 to
2-Wire 458 K 0.2 K 0.01

700

Series
3-Wire

Select

100 mV count

200 mV count

500 mV count

-150 to 5 µV/

1000 mV count

31 to

213°F 0.4°F 0.01°F

0 to

100°C 0.2°C 0.01°C

272.6 to

373.8 K 0.2 K 0.01 K

0.01% rdg
±1 digit

DP81T, $599, shown
smaller than actual size.

M

conversion, dual slope method with a
true, four-wire ratio measurement. This
method assures accurate and stable
readings even in noisy environments
that can occur with fluctuating excitation
power. Also, it allows these indicators to
be used with floating or grounded
transducers. Three alphanumeric LED’s
are supplied either for display of
engineering unit tables (e.g., psi, kg, lbs)
or as “0” for active display of dead zeros.

Dual Engineering Units

The primary and secondary engineering
unit displays are standard on all units
and easily toggled from the front panel.
For example, the primary could be
pounds (lb) while the secondary a
mathematically proportional kilograms
(kg). Because of their math equivalency,
all options function correctly, regardless
of display selection. System calibration
can be accomplished using a 3-point “live”
load, such as actual weight on a scale,
or via electronic instrument calibration
using a dc voltage source. To reduce
settling indications on the display or
option outputs, the display can be
rounded to count by 1, 2, 5, 10, or 100
counts via a simple program menu
selection. Auto zero (tare) can be
accomplished by the auto zero menu
command or while the process is
running. A simple, simultaneous push of
the “down” arrow and “enter” keys will
re-zero the indicator.

3 Strain Gage Models

There are 3 basic models of strain gage
indicators from which you can select.
The models vary by panel or benchtop
design, isolated excitation power supply
and the availability of option slots. The
DP87, available with 1 option slot,
includes a built-in excitation supply
capable of driving 2 parallel 350 bridges.
The excitation supply is switchable for
5, 10, or 15 Vdc. The DP88 and DP89
series have a larger double-width
chassis which allows up to 4 option
boards, and they include a higher output
excitation power supply. This excitation
supply is switchable for 5, 10, 15, or
20 Vdc with the capability to drive up to
8 parallel 350 Ω bridges.

Available Options Slot Summary:
DP87: 1, DP81: 2, DP88: 4,
DP89: 4, DP82: 5, DP85: 5, DP86: 5

Multiple Input Options
(DP80-206 and DP80-403)

Monitor as many as 24 inputs.
The first multiple-input card provides an
additional 5 channels of thermocouple
or voltage, or 2 channels of RTD or
thermistor input. Additional cards add
6 more thermocouple or voltage, or
3 more RTD or thermistor, inputs. The
DP81 can use 1 card while the DP82,
DP85, DP86 models can have a
maximum of 4 cards. The multiple input
options are not for use with “C”-current
loop input or DP87 or DP88
strain gage versions.

DC Power Options
(DP80-DC1 and DP80-DC2)

For automotive, marine, aviation, or
plant DC power loops, the DP80 Series

can be configured for 12 or 24 Vdc
power operation. DP87 and DP88
models cannot be used with Vdc power.

Differential Measurement
(DP80-2DI and DP80-4DI)

This card provides an additional input
channel and the capability to display the
differential (sT) between the 2 channels.
The DP80-2DI card is used with
thermocouple and voltage input models.
The DP80-4DI option is specifically for
use with RTD or thermistor configurations.
This function can be combined with the
DP80-MTH for maximum, minimum, and
average deltas, or used with DP80-AOC
or DP80-AOV for scaled analog output of
differentials and alarm points based on
differential limits. (The DP80-2DI and
DP80-4DI cannot be used with the
DP80-206 and DP80-403 options or
with current loop or strain gage versions.)
Order option DP80-2DI for DELTA and
2 thermocouple or voltage inputs, and
DP80-4DI for DELTA and 2 RTD or
thermistor inputs.

Alarms (DP80-ALM)

Each DP80-ALM option card provides
2 alarms with separate limits and relays.
Up to 2 cards can be ordered per unit.
Any combination of high, low, or ± values
can be used to trigger the alarm from
either actual or math processed inputs.
Trigger delay and a programmable
deadband are included standard.

Analog Output
(DP80-AOC and DP80-AOV)

For output to recorders or other analog
input instruments, you can choose from
2 fully isolated linearized analog outputs.
Both output types, 4 to 20 mA or 0 to
10 Vdc, can be fully scaled. Output can
be assigned to direct measurements or
math values.

Math Expressions (DP80-MTH)

This card provides display of maximum,
minimum, rate of change, or timed
average value of measurements. Front
panel keys allow you to view the math
value or switch back to view the actual
measured value.

Scaling and Offset Option
(DP80-SCL)

Specifically designed for use with
“V”-voltage and “C”-current loop versions
of the DP81 and DP82 Series, the
DP80-SCL option provides wide-range
user scaling of the display for process
units. With this option, you can re-scale
and offset inputs for display in direct
engineering units to ±99999 counts. In
addition, you can assign alphanumeric
labels or dead zeros to the displayed
units. For example, 4 to 20 mA could be
scaled to display “0.00-255.00 PSI”,
“LBS”, “KG”, “GPM”, etc. It's that easy.
Unlike other instruments, you need not
perform any computations or enter any
formulas. Simply enter upper and lower
input and output values. The DP80
Series does the rest, adjusting the
optimum slope and offset for you
automatically. Since digital scaling is
built-in, this option is not for use with
Models DP87, DP88 or DP89.

3 Digital Output Modes are available
for output to digital equipment.

RS232C/20 mA Serial Output Options
(DP80-SER) RS232 serial output or

20 mA interface sends display
information in serial ASCII format. 300
to 9600 baud rates are user-selectable.

Specifications

Display: 8-digit, 14-segment alphanumeric

red LED’s 13.7 mm H (0.54"), and
1 negative “-” LED at left of the array

Display Resolution:

DP81, DP82, DP86, DP87, DP88, DP89:

5-digit 0.1° resolution;

DP85: 4-digit 1° resolution
Repeatability: ±1 digit
Zero Stability: 0.5 µV/˚C
Span Stability: 0.005% rdg/°C
Normal Mode Noise Rejection:

NMRR: 60 dB at 50 Hz/60 Hz ±0.1 Hz
Common Mode Noise Rejection:

120 dB at 50 Hz/60 Hz ±0.1 Hz

Overload Protection:

Power Lead to Ground:

1500 Vdc or Vac RMS

Input to Ground:

270 Vdc or Vac RMS

Across Inputs: 270 Vdc or

Vac RMS continuous

4 to 20 mA Range: 80 mA

10 to 50 mA Range: 200 mA
Input Impedance:

Thermocouples: 22 MΩ (with 20 nA

of break detect current)

RTDs: I1 to VinLo (10 MΩ), I2 to

VinLo (12.3 kΩ), depending on range

VinHi to VinLo (500 MΩ)

Thermistors: I1 to VinHi (3.2 kΩ),

I1 to I2, (9.45 kΩ)

Voltage: 10 to 500 MΩ

(depending on range)

Current: <15 Ω

Strain Gage: 10 to 500 MΩ

(depending on range)

Environmental Ranges

Operating Temperature: 0 to 50°C

(32 to 122°F)
Storage Temperature: -40 to 65°C
(-40 to 149°F)

Humidity: <90% RH, non-condensing

Input Connections

Sensors: Screw terminal blocks
Multi-Input (Quick-Connect AC
Power, Plug-in DC Power): Screw

terminal blocks

Alarm Option (DP80-ALM):

2 alarm settings per alarm option—up to
2 alarm options per instrument, form “C”
(SPDT) relay output (1 A at 120 Vac)
reset auto, manual, remote, and over­ride selectable alarm delay and deadband

Multi-Input Options Accuracy
(DP80-206) Thermocouple: ±10 µV

to ±70 µV depending on thermcouple
type and measurement point

M-67

(DP80-403) RTD:

Extended Warranty

Program

SM

Cu10: ±10 mΩ
All Others: ±50 mΩ
Current Loop and Thermistor: No effect

Point Update Rate: 2 readings/s,

1 reading/s for R, S, B, C, G, D, and
CGI thermocouples

Program Storage: EEPROM
Case Construction: Metal, black

anodized, extruded aluminum
Panel Mounting: Installation panel

mounting from front, secured at sides by
rail clamps supplied with each indicator

Power: 90 to 132 Vac, 48 to 400 Hz
Optional 220 Vac Power:

190V to 262V: 48 to 400 Hz

Optional Low-Voltage Power:

9 to 16 Vdc and 18 to 32 Vdc

Excitation Supply

Model DP87: 5, 10, and 15 Vdc, switch

selectable isolated, will drive two parallel
350 Ω strain gages at 15 Vdc (90 mA)

Models DP88 and DP89: 5, 10, 15, and
20 Vdc, switch selectable, isolated, will
drive eight parallel 350 Ω strain
gages at 15 Vdc (350 mA)

Dimensions

DP81, DP87: 67 H x 136 W x 250 mm D

(2.63 x 5.34 x 9.87")
DP82, DP88: 67 H x 272 W x 250 mm D

(2.63 x 10.69 x 9.87")

Panel Cutout:

DP81, DP87: 68 H x 138 mm W

(2.68 x 5.44")
DP82, DP88: 68 H x 274 mm W
(2.68 x 10.79")

OMEGACARE
extended warranty
program is available for
models shown on this
page. Ask your sales
representative for full
details when placing an
order. OMEGACARE
covers parts, labor and
equivalent loaners.

SM

SM

MOST POPULAR MODEL HIGHLIGHTED!

To Order (Specify Model Number)

Model No. Price Description Resolution Total Input Boards
DP81(*) $599 Panel meter, single width 0.1° 21
DP82(*) 679 Panel meter, double width 0.1° 54

Comes complete with operator’s manual.

Specify Input Type: “T” temperature, “V” voltage, “Y” thermistor, “C” current, “R” RTD.

*

For 220 Vac power, add suffix “-220”; no additional charge.
Ordering Examples: DP82T-206-206-206-ALM-AOV-220, DP82 configured for 18 channels of thermocouple input, with alarms and

0 to 10 Vdc analog input with 220 Vac power. Ranges and accuracies for signal conditioner boards on previous pages.
$679 + 179 + 179 + 179 + 169 + 189 = $1574.

OCW-3, OMEGACARESMextends standard 1-year warranty to a total of 4 years ($350), $1574 + 350 = $1924.

Max No. of Plug-In

Option Boards

Max Multi-Channel

Strain Gage Indicators

Max Number of Plug-In

Max Multi-Channel

Model No. Price Description Total Input Board

Excitation Supply Specifications

DP87 $729 Panel meter 1 N/A 2 parallel 350 Ω gages @ 150 Vdc (90 mA)

single width switchable 5, 10, 15 Vdc power

DP88 899 Panel meter 4 N/A 8 parallel 350 Ω gages @ 150 Vdc (90 mA)

double width switchable 5, 10, 15, 20 Vdc power

Comes with an excitation power supply which uses 1 option board slot.

Other Option Boards (Field Installable)

Option Availability

DP81 DP82 DP87

Model No. Price Description DP85 DP86 DP88, DP89
DP80-DC1†$129 9 to 16 Vdc power ⻬⻬ —

DP80-DC2†129 18 to 32 Vdc power ⻬⻬ —
DP80-2DI* 129 2-wire delta input,

differential 2-wire input ⻬⻬ —

DP80-4DI* 129 4-wire delta input,

differential 4-wire input ⻬⻬ —

DP80-ALM 169 Alarms, dual limits

Multiple Input Board
(Field Installable)

Model No. Price Description
DP80-206 $179 6-channel input

board for
thermocouple,
voltage, current
inputs

DP80-403 179 3-channel input

board for RTD and
thermistor inputs

(up to 2 per unit) ⻬⻬ ⻬

DP80-AOC* 189 Analog output, 4 to 20 mA ⻬⻬ ⻬
DP80-AOV* 189 Analog output, 0 to 10 Vdc ⻬⻬ ⻬
DP80-MTH 99 Math, min, max,

average, rate of change ⻬⻬ ⻬

DP80-SCL 99 Scaling/offset, ⻬⻬ —

user selectable

DP80-SER 189

†

,*Mutually exclusive options.

RS232C/20 mA serial output

⻬⻬ ⻬

Rack Mount Accessories

Model No. Price Qty. Use With
DP80-RK1 $75 1 DP81

DP80-RK2 75 2 DP81
DP80-RK3 75 3 DP81
DP80-RKM 150 1 DP82

M-68

M

One Omega Drive | Stamford, CT 06907 | 1-888-TC-OMEGA (1-888-826-6342) | [e-mail]

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