Omega Products DRA-TCI-2 Installation Manual

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Contents

1. Procedure To Open The Housing

2. Calibration Instructions

2.1

Switch Setting

2.2

Calibration Tables

2.3

Calibration Instrumentation

3. Connection Diagram

4. Mechanical Dimensions

5. Specifications

1

1. Procedure to open the housing
Carefully insert a proper screwdriver tip into the side slots. By pressing

inward and rotating, the plastic locker will release.
Gently pull out the unit's front panel.

To close the unit, insert the printed
circuit board in the proper side guiding
slots and push it all the way until
the front panel clicks with the body box.

2. Calibration instructions

Fig.1

2.1 Switch Setting
Inside the enclosure are located six DIP switches for coarse range, and two

multiturn trimmers are located on the transmitter panel for fine tuning.
Notes:

-The DRA-TCI-2 is orderd for a specific T/C, and can not
be altered.

-The following tables indicate coerse ranges. at the
outer limits of range it might occur that the
desired range can be obtained with
the adjacent switch combination.

2

Fig.2

Calibrations steps:

Define the desired range limits:

a.

Tmin - the temperature at which the output current is 4mA.
Tmax - the temperature at which the output current is 20mA.
Tspan - the difference between Tmax and Tmin.

Open the transmitter according to para. #1.

b.
c.

According to the following tables, set switches no. 4 to 6 for the Zero
(Tmin), and set switches 1 to 3 for the Span (Tspan).

Note: "1" represent the switch "ON" state.

2.2 Calibrations tables
"Span" Table

SW

1-2-3
0 0 0
1 0 0
1 1 0
0 0 1
1 0 1
0 1 1
1 1 1

o

K (

C)....

90.....180

175.....360

250.....440

420.....850

820...1350

J (oC)....

50......95

85....150

140....250

240....490

480....760

T/C Type

T (oC)....

50.....80

60...105

90...165

155...325

310...400

E (oC)....

50......95

90....175

169....280

270....575

530....1100

B,R,S (oC)..

500....1100

1000....1700

3

"Zero" Table

SW

4-5-6
0 0 0
0 0 1
0 1 0
0 1 1
1 0 0
1 0 1
1 1 0
1 1 1

o

K (

C)....

0.....30

25.....60

45.....90

80...120

115...160

150...190

190...230

225...265

J (oC)....

0.....42

30.....85

70...125

110...175

165...215

200...265

250...320

300...350

T/C Type

T (oC)....

-40....-20

-25.......5

0.....30

25.....60

55.....85

80...110

105...135

130...160

2.3 Calibration instrumentation:

1. 24Vdc Power Supply

2. T/C calibrator

3. High accuracy DVM

4. Small screwdriver
Connect the transmitter to be

calibrated according to Fig #3.

a. Set the T/C calibrator to Tmin.
b. Adjust the Zero trimmer to 4.000mA.
c. Set the T/C calibrator to Tmax.
d. Adjust the Span trimmer to 20.000mA.
e. Repeat steps a. to d. until satisfactory
results are achieved.

4

E (oC)....

-100....-52

-52.....56

56...162

162...269

215...320

B (oC)....

100....465

460....870

865..1270

1270..1670

DRA–TCI–2

R,S (oC)..

0...180

120...280

240...380

340...480

440...580

540...680

640...800

Fig.3

Calibration example:
Needed: T/C Type K - 200...+500

o

C

Tmin: 200
Tspan: 500-200 = 300

1. Set the DIP switch to: 0,0,1,1,1,0 (SW1..SW6)

2. Set the calibrator for 200

3. Set for +500

4. Repeat steps 2,3 until satisfactory results are obtained.

o

C

o

C and calibrate "S" to 20.000mA.

o

C

o

C calibrate "Z" to 4.000mA.

3. Connection Diagram

DRA-TCI-2

Fig.4

5

4. Mechanical Dimensions

99

(3.9)

75

(2.95)

Dimentions are in mm (in)

5. Specifications

Input: Thermocouple type K, T, J, E, B, R, S
Burnout protection: Upscale
Minimum input span: 4mV
Output: 4–20mA, (25mA limited)
Loop resistance: Rmax(Ω) = (Vsupply - 10)/.02
Isolation: 1500 Vdc or peak ac
Response time: 160 msec (0-98%)

6

22.5

(0.9)

S
Z

82

(3.23)

Fig.5

Calibration:
Span Calibration: Three DIP switches and "Span" potentiometer
Zero Calibration: Three DIP switches and "Zero" potentiometer
Cold junction compensation error: Typical ±0.9OC for 0-60OC change
(±3OC for B, R and S)
Accuracy (linearity, hysteresis and repeatability):

± 0.08% of span for type K,
± 0.1% to ± 0.2% for other thermocouple types, typical

Test terminals: 40 to 200mV represent 4-20mA
Supply voltage: 10 – 40 Vdc reverse polarity protected
Supply and load variation effect: < ±0.03% of span for full change
CMR: 127db typical dc to 60 Hz
Temperture stability: ±0.01% of span /1OC
Operating temperture: -20 to +70OC (-4 to 158OF)
Storage temperture: -30 to +85OC (-22 to 185OF)
Humidity: 5 - 95% relative humidity, non-condensing
Housing: Plastic polycarbonate
Protection level:
Housing: According to IP-40
Terminals: According to IP-20
Mounting: Standard 35 mm DIN rail
Weight: 130 grams (4.6 oz)

7

WARRANTY/DISCLAIMER

OMEGA ENGINEERING, INC. warrants this unit to be free of defects in materials and
workmanship for a period of 13 months from date of purchase. OMEGA Warranty adds an
additional one (1) month grace period to the normal one (1) year product warranty to
cover handling and shipping time. This ensures that OMEGA’s customers receive maximum coverage
on each product. If the unit should malfunction, it must be returned to the factory for evaluation.
OMEGA’s Customer Service Department will issue an Authorized Return (AR) number immediately
upon phone or written request. Upon examination by OMEGA, if the unit is found to be defective
it will be repaired or replaced at no charge. OMEGA’s WARRANTY does not apply to defects resulting
from any action of the purchaser, including but not limited to mishandling, improper interfacing,
operation outside of design limits, improper repair, or unauthorized modification. This WARRANTY
is VOID if the unit shows evidence of having been tampered with or shows evidence of being
damaged as a result of excessive corrosion; or current, heat, moisture or vibration; improper
specification; misapplication; misuse or other operating conditions outside of OMEGA’s control.
Components which wear are not warranted, including but not limited to contact points, fuses, and
triacs.

OMEGA is pleased to offer suggestions on the use of its various products.
However, OMEGA neither assumes responsibility for any omissions or
errors nor assumes liability for any damages that result from the use of
its products in accordance with information provided by OMEGA, either
verbal or written. OMEGA warrants only that the parts manufactured by
it will be as specified and free of defects. OMEGA MAKES NO OTHER
WARRANTIES OR REPRESENTATIONS OF ANY KIND WHATSOEVER,
EXPRESSED OR IMPLIED, EXCEPT THAT OF TITLE, AND ALL IMPLIED
WARRANTIES INCLUDING ANY WARRANTY OF MERCHANTABILITY AND
FITNESS FOR A PARTICULAR PURPOSE ARE HEREBY DISCLAIMED.
LIMITATION OF LIABILITY: The remedies of purchaser set forth herein are
exclusive and the total liability of OMEGA with respect to this order,
whether based on contract, warranty, negligence, indemnification, strict
liability or otherwise, shall not exceed the purchase price of the component
upon which liability is based. In no event shall OMEGA be liable for
consequential, incidental or special damages.

CONDITIONS: Equipment sold by OMEGA is not intended to be used, nor shall it be used: (1) as
a “Basic Component” under 10 CFR 21 (NRC), used in or with any nuclear installation or activity;
or (2) in medical applications or used on humans. Should any Product(s) be used in or with any
nuclear installation or activity, medical application, used on humans, or misused in any way, OMEGA
assumes no responsibility as set forth in our basic WARRANTY / DISCLAIMER language, and
additionally, purchaser will indemnify OMEGA and hold OMEGA harmless from any liability or
damage whatsoever arising out of the use of the Product(s) in such a manner.

8

RETURN REQUESTS / INQUIRIES

Direct all warranty and repair requests/inquiries to the OMEGA Customer Service Department.
BEFORE RETURNING ANY PRODUCT(S) TO OMEGA, PURCHASER MUST OBTAIN AN AUTHORIZED
RETURN (AR) NUMBER FROM OMEGA’S CUSTOMER SERVICE DEPARTMENT (IN ORDER TO
AVOID PROCESSING DELAYS). The assigned AR number should then be marked on the outside
of the return package and on any correspondence.
The purchaser is responsible for shipping charges, freight, insurance and proper packaging to
prevent breakage in transit.

FOR WARRANTY RETURNS, please have the
following information available BEFORE
contacting OMEGA:

1. P.O. number under which the product
was PURCHASED,

2. Model and serial number of the product
under warranty, and

3. Repair instructions and/or specific
problems relative to the product.

OMEGA’s policy is to make running changes, not model changes, whenever an improvement is possible.
This affords our customers the latest in technology and engineering.
OMEGA is a registered trademark of OMEGA ENGINEERING, INC.

© Copyright 1996 OMEGA ENGINEERING, INC. All rights reserved. This document may not be copied,
photocopied, reproduced, translated, or reduced to any electronic medium or machine-readable form,
in whole or in part, without prior written consent of OMEGA ENGINEERING, INC.

FOR NON-WARRANTY REPAIRS, consult
OMEGA for current repair charges. Have the
following information available BEFORE
contacting OMEGA:

1. P.O. number to cover the COST
of the repair,

2. Model and serial number of product, and

3. Repair instructions and/or specific
problems relative to the product.

Where Do I Find Everything I Need for

Process Measurement and Control?

OMEGA…Of Course!

TEMPERATURE

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M2567