Omega 400B-TC, 400B-RTD, 402B-TC, 402B-RTD User guide

TABLE OF CONTENTS

Model: 400B-TC, 400B-RTD, 402B-TC, and 402B-RTD

M3777/0602

SECTION 1

1.1 GENERAL DESCRIPTION 1
OPTIONS 2

SECTION 2 SPECIFICATIONS 3
SECTION 3 INSTALLATION 4

3.1 UNPACKING and REPACKING 10

3.2 CONFIGURING 12

3.3 MOUNTING 18

3.4 WIRING 19

SECTION 4 OPERATION 22
SECTION 5 CALIBRATION 26

Note: This manual is for the enhanced version of the Model 400
and 402 units. For models 400 and 402 before 3-2002 with serial
numbers without the letter “N” please refer to manual part
number M0035.

SECTION 1 DESCRIPTION

1.1 DESCRIPTION.

This manual contains installation, operation, and calibration
information for Series 400 digital indicators. These solid-state
instruments digitally display a temperature of thermocouple,
RTD type of sensors. All instruments feature a dual-slope A/D
converter with multi-segment digital linearization, reference
junction compensation, and a large 0.8” (20mm) easy-to-read
4-digit LED display.

The displays are in-line, uniplanar, 7-segment RED

LEDS, easy to read through the front Plexiglas panel. A single
dash (-) displayed at the left of the read-out indicates a
negative polarity. Positive readings are inferred (no sign
displayed). All dashes (----) across the display indicate an
overload, over- range, or open thermocouple condition. Zeros
to the left of the decimal point or most significant digit are
suppressed. The indicator accepts NBS thermocouple types J,
K, T, E, S, R, and B; or 3-wire platinum resistance temperature
detectors (RTD) with α of .00385 or .00392. The instrument
can be configured to display 1° resolution throughout the
range in °F or °C. It can also be configured to display 0.1
resolutions in °F or °C up to 999°. It automatically switches to
1° resolution above 999.9°. R,S and B thermocouples are

1

fixed with 1 degree resolution. The instrument can be easily
converted between degrees C or degrees F.

All units operate from 100, 120, 220, or 240VAC 50-60

Hz power source. A power connector and ground screw for
shield are located at the rear of the instrument. The instrument
case is made of solid die-cast aluminum, which is rugged
enough to withstand the most hostile environments. It is
designed to mount in a panel. The optional rack mount can
accommodate up to 3 units. Bench mount option 400-W5
provides for convenient bench top use.

Multiple Input Options, Models 402, 405 and 409

Model 402 can accept five inputs of the same input type
thermocouple . Buttons numbered 1-5 are located below the
display. Individual input is selected by pressing the appropriate
button.
The Model 405A provide 10-switchable inputs to a single
indicator. The Model 405A is housed in the same rugged case
design as the basic indicator. Each unit may be rack-mounted
beside another 405A or indicator. Pushbuttons are in two rows
of five and are numbered 1-10, 11-20, etc. Each horizontal row
is interlocked to prevent simultaneous input selection.
However, top and bottom rows are not interlocked and errors
will occur if buttons on the top and bottom rows are pushed at

2

the same time. Model 405 is used for thermocouple ranges.
Model 409 is used for RTD models.

3

SECTION 2 SPECIFICATIONS
Operating Range:

Temperature: 0 to 50°C
Relative Humidity: 10-80% RH non-condensing

Storage Range:

-40 to 65°C

Power:

115VAC ± 10%, 50-60 Hz
230VAC ± 10%, 50-60 Hz
30mA Max input current @ 115VAC

Size:

Case: 144mm W x 72mm H x 173 mm D
(5.768” x 2.84” x 6.82”)

Maximum Weight:

1.7 kg / 2.5 lb

Panel cutout:

68mm H x 138mm W

2.68” H x 5.44” W

4

Input Impedance:

Thermocouple: 20MΩ (exclusive of break detect current
effects)
RTD: 16.9kΩ, V+ input; 16.9kΩ, I – input

Break Detection:

Upscale, ≈50 nanoamps

A/D Read Rate:

2 per second nominal, 1° reading; 1 per second
nominal, 0.1° readings

Reference Junction (Thermocouple):

Internal, automatic

5

FUNCTIONAL SPECIFICATIONS

Input Range Table

INPUT TYPE

J Thermocouple

K Thermocouple

T Thermocouple

E Thermocouple

S Thermocouple

R Thermocouple

B Thermocouple

PT 100 RTD

.00385

PT 100 RTD

.00392

RANGE
(0.1 degree
resolution)

-99.9 to 761.8 C

-99.9 to 999.9 F

-99.9 to 999.9 C

-99.9 to 999.9 F

-99.9 to 401.4 C

-99.9 to 754.6 F

-99.9 to 999.9 C

-99.9 to 999.9 F

-99.9 to 862.6 C

-99.9 to 999.9 F

-99.9 to 850.8 C

-99.9 to 999.9 F

RANGE
(1.0 degree
resolution)

-205 to 762 C

-337 TO 1403 F

-202 to 1377 C

-331 to 2510 F

-210 to 401 C

-346 to 755 F

-205 to 1002 C

-338 to 1835 F
0 to 1769 C

32 to 3218 F

0 to 1769 C

32 to 3216 F

316 to 1829 F
601 to 3325 F

-200 to 863 C

-329 to 1585 F

-202 to 851 C
332 to 1563 F

6

PERFORMANCE SPECIFICATIONS

Reference Operating Conditions (ROC):

±10% line voltage
23 ±2 °C ambient temperature
<80% RH non- condensing

Accuracy (at ROC): +/- 1 count LSD

ACCURACY

SENSOR TYPE

1 Degree Resolution

0.1 Degree
Resolution

J, K, T, E Thermocouple

R, S, B Thermocouple

Pt .00385 and

Pt .00392 RTD

1 degree +/- .03%

1 degree +/- .05%

1 degree +/- .03%

7

RDG

RDG

RDG

+/- 0.5 degree C
+/- 1.0 degree F

+/- 0.5 degree C
+/- 1.0 degree F

Multi-Input Option Accuracy:

Add ± 0.5 °C / ± 1° F to accuracy specification when
Multi-Input option is used.

Noise Rejection:

NMRR: ≥ 60 db @ 50/60 Hz, ± 0.1Hz
CMRR: ≥ 120 db@ 50/60 Hz, ± 0.1Hz with 250Ω unbalance.

RTD Leading Error @ 150 µµA excitation current:

40 milliohms per Ohm of equal resistance in V+ and V- leads
1 Ohm per Ohm of unbalance in V+ and V- leads
Overload Protection:
Power lead to ground: 115VDC or AC RMS
Across inputs
T/C: Up to 250VDC or VAC for 1 minute, V+ to V­RTD: Up to 125VDC or VAC for I minute, V+ to V­Up to 62 VDC or VAC for 1 minute, V- to I

Stability With Temperature:

Zero: 1µV/°C
Span: 0.01% rdg /°C
Thermocouple Reference Junction: 0.03° per degree, 5 ­45°C

8

Stability With Time:

1°/year

Repeatability:

±1 count

9

SECTION 3 INSTALLATION

3.1 UNPACKING / REPACKING

The Series 400 indicators are rugged, but they must be
properly packed. Instruments are shipped in a custom­designed carton for shipping, but damage may occur. When
you receive your instrument, look for evidence of transit
damage. If damage is found, ask the carrier to prepare a
Damage Inspection Report and notify our Instrument Repair
Department immediately. If your instrument has arrived in
good condition, you may perform the functional test described
in 3.2.2 to verify proper operation.

REPACKING AND RETURNING THE INSTRUMENT

The original shipping container should be retained in case the
instrument must be returned for repair or modification. When
returning an instrument for any reason, advise us of the model
number, serial number, your name, billing address, shipping
address, phone number and a description of the problem.
This information will enable our Instrument Repair Department
to expedite the return of your instrument. Instruments being
returned to the factory are required to be shipped freight
prepaid.

Instruments being returned for warranty service must

also refer to the original purchase date on packing lists and

10

purchase orders. Instruments without this information will be
processed as a non-warranty repair at current service rates.

If the original shipping container has been discarded,
pack your instrument for shipping as follows:
Select a strong cardboard box of sufficient size to allow an
inch of packing material around all sides of the unit.

a. Ensure that the printed circuit boards are secured

and front and rear panels are firmly in place.

b. Wrap the instrument in plastic or strong paper.

Place it centrally in the shipping container, and
pack poly foam, bubble pack, or rubberized hair
around all six sides of the instrument.

c. Tape the carton flaps securely and label the

container “FRAGILE, DELICATE INSTRUMENT”.
Ship the instrument, freight prepaid (do not ship by
U.S mail)

11

3.2 CONFIGURING THE INSTRUMENT

3.2.1 GENERAL

The instrument is configured at the factory for various power,
range sensor type, and display requirements as stated on the
initial order. However, the instrument can easily be
reconfigured to accommodate any future changes as required
by the user.
The following paragraphs describe input voltage selection,
sensor type (T/C), °C/°F selection and 1°/ 0.1° resolution.

3.2.2 INSTRUMENT CHECKOUT PROCEDURE

An instrument functional checkout may be made as follows:

a- Remove the rear cover.

b- For thermocouple type input short input sensor

terminals with copper wire

c- Apply power to the instrument. The display should

approximate the approximate readout in the table
on the following page.

12

INPUT TYPE

SIGNAL INPUT

TERMINALS

READOUT

Thermocouple

RTD

See Note 1

100 ohms 0 C to 32 F

room

temperature

Note1: For “B” thermocouple range, simulate the TC input with
a millivolt calibrator. Example: a 4.833mV input should
produce a display of about 1832°F(1000°C).

Note 2: For RTDs connect +V , –V and –I. Connect a resistor
equal to 100 ohms between +V and –V.

3.2.3 If the sensor type needs to be changed, refer to the

following instructions.

13

REMOVING THE ELECTRONICS FROM THE ENCLOSURE

1- Make sure to disconnect power from the unit

2- Remove the three back cover screws and remove

the rear panel

3- Remove the screw located directly above the AC

plug

4- Remove two screws from the front panel lens

and remove lens

5- Remove two screws from the front holding the

Board assembly and pull it out of the case.

6- Reinstall the assembly when finished.

14

Input Voltage Selection (requires removal)

Input voltage 115 or 220VAC, is selectable by cutting and
adding jumpers on the main board as shown in below. Locate
JP18 on the printed circuit board. Cut and make connection as
shown on table depending on input voltage.

Input Voltage JP18

120 VAC
220 VAC

1 2 3 4 5 6

JP18

15

1-2, 4-5
2-3, 5-6

3.2.4 Changing Sensor type

Locate the JP14, JP15, JP16 and JP17 located behind the front
panel lens. Remove and reinstall jumper blocks to select the type of
sensor. The following configuration change requires removal of

the front panel lens only. RTD units may be configured for RTD
only.

JP14 JP15 JP16 JP17

J

K

T

E

S

R

B

PT1
385

PT2
392

CAL

16

Table 3.2 CONFIGURATION CHART

3.2.5 The following configuration change requires removal
of the front panel lens only.

Changing form °F to °C or °C to °F and 1° to 0.1° or 0.1° to 1°
resolution.
Locate switch S4 on lower left comer of the assembly behind
the front lens.
Toggle the switch to the desire position as shown below.
Reinstall the front lens.

1 degdeg F

Dip Switch

0.1 degdeg C

17

3.3 INSTALLATION
Panel Mounting

Panel mounting hardware is supplied standard with the
instrument. The instrument bezel butts against the front of the
mounting panel; the mounting bracket fits over the instrument
rear panel. The bracket screws force it against the rear of the
mounting panel, locking the instrument in place. Panel cutout
dimensions are 68mm x 138mm (2.68” x 5.44”).

BRACKET

SCREW 2 PL

REAR COVER

SCREW

REAR PANEL

PANEL

MOUNTING

BRACKET

PLASTIC PLUG

18

3.4 WIRING THE INSTRUMENT.

All signal input connections are made to the instrument
using screw terminals. To gain access to the recessed
terminal strip, the rear cover panel must be removed. The four
signal input terminals are located in the upper-left corner, and
are labeled +V, -V, and -I.

REMOVE THE POWER CORD BEFORE WIRING

Basic Single Channel Wiring

+V -V -I

SENSOR INPUT TERMINALS

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SENSOR

GROUND

(IF NEEDED)

Model 402 Switching Unit Wiring

(Thermocouples)

OPTIONAL GROUND,
DEPENDING ON SENSOR WIRES

-I+V -V

T/C WIRE

+

-

+

-

-

+

+

SENSOR WIRES 402 5 PL

-

+

-

+

12345

-

20

Model 402 Switching Unit Wiring

(3-WIRE RTDs)

-I+V -V

12345

-

+

Buss all current legs to main board terminal

+

-

+

-

+

-

+

-

+

-

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SECTION 4 OPERATION

4.1 APPLYING POWER TO THE INSTRUMENT

Power is applied to the instrument as long as the
instrument is plugged into an active source. To remove power,
unplug the power cord from the instrument or AC outlet.

To eliminate shock hazard or possible instrument
damage, always remove the power cord either from the
instrument or power source before calibrating or configuring
the indicator.

4.2 USING BASIC UNITS MODELS 400

Models 400 indicators are single range indicators with
a single input. Once the instrument is configured for the
desired range, measurements can be made by connecting the
appropriate sensor to the rear input terminals

22

Front Panel Model 400 Basic indicator

23

4.3 USING THE 5 INPUT SWITCHING UNITS MODELS 402

The 5 input switching units accommodate five inputs of
the same range as determined by the analog program model.
Inputs are selected by a row of pushbuttons directly below the
display. The pushbuttons are number 1-5 Pressing a particular
pushbutton selects that input point for display. The
pushbuttons are interlocked so that only one pushbutton is
selected at one time.

FRONT PANEL, 5 INPUT UNIT (MODEL 402 SHOWN)

1 3 4 52

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4.5 USING THE EXTERNAL SWITCHING UINTS (MODELS
405/409) AND SWITCH ERROR BOARD (OPTION 001A)

The External Switching Units provide 10 switchable
inputs to a single indicator. Inputs are selected by two rows of
front panel pushbuttons labeled 1-10. For special numbering
contact factory. Pressing a particular pushbutton selects that
input point for display. Each row of pushbuttons is interlocked
so that only one pushbutton within that row is selected at once
time.

1 3 4 52

6 8 9 107

25

SECTION 5 CALIBRATION

Calibrating your indicator once a year is recommended to
assure specified accuracy. Be sure to calibrate your indicator
whenever you change between thermocouple and RTD type
sensors.

Locate JP14 – JP17 behind the front lens as shown below.
Remove the jumper blocks (from JP14-JP17) and install
across JP15 and JP16 to enter the CAL mode. Refer to the
table on page 16. Remember the original jumper block
configuration before removing.

zero span

JP14-17

F/C and 1 deg/0.1deg switch

26

PROCEDURE: Thermocouple Input
Equipment Required:

A Precision DC voltage source with a resolution to

1µV; accuracy ±0.01%(±2µV)

Interconnecting copper wire from the DC source to the

unit

Trimmer adjusting tool (blade type)

Make sure the AC power to the unit is turned OFF

1- Observing contact polarity, connect the voltage

source to the Thermocouple inputs as show in the
wiring diagram on page 20.
Turn power ON.
Locate the Zero and Span control pot on the

display board.
2- Adjust the voltage source output to 0.00mV.
3- Adjust the ZERO control for a display reading of

0.0(±0.1).

(Note: display readings take up to 3 seconds to

respond to change in control setting.)
4- Adjust the voltage source output to 39.000mV.
5- Adjust the SPAN control for a display reading of

560.0(±0.1) (Note: display reading take up 3

second to respond to changes in condition setting.)

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6- Turn OFF the AC power. Reinstall the jumper

blocks to the desired thermocouple type and install

the front panel lens. This completes calibration for

thermocouple input.

PROCEDURE: RTD Input For RTD 3- wire Input
Equipment Required:

A precision resistance decade box with a resolution of

0.01Ω and an accuracy of ±0.02%
Interconnecting copper wire from the resistance

source to the unit

Trimmer adjusting tool (blade type)
1- Connect a decade resistance box to the RTD input

(+V, -V and I) 3 wires as shown in the wiring

diagram on page 20. (Be sure the power is OFF

when making connection.)
2- Adjust the decade box to 0.00Ω.
3- Adjust the ZERO control for a display reading of

0.0(±0.1).

(Note: display readings take up to 3 seconds to

respond to change in control setting.)
4- Adjust the decade box to 265.00Ω.

28

5- Adjust the SPAN control for a display reading of

543.8 (±0.1). (Note: display readings take up 3

seconds to show changes in control setting.)
6- Turn OFF the AC power. Set the jumper blocks to

the desired RTD range (PT1=α. 00385 PT2=α.

00392), install the front panel lens. This completes
calibration for RTD input.

29