Texmate TM Series, TM-35 Series, TM-35XJC, TM-35XJF, TM-35XKC Operating

Texmate, Inc.Tel. [phone] • www.texmate.comSeptember 10, 2003 TM-35X DS (TM08) Page 1

Compatibility

Specifications

A low cost LCD temperature meter for 'J' or 'K' thermocouples,

˚C or ˚F, 5V DC powered with screw terminal or edge connector inputs.

TM-35XJC, TM-35XJF,

TM-35XKC & TM-35XKF

Panel Temperature Meters

3 1/2 Digit 0.48” LCD

in a Slim Bezel Case

Input Configuration:..........True differential and single-ended.

Thermocouple Ranges:....0 to 760˚C

0 to 1400˚F

0 to 1260˚C
0 to 1999˚F
(consult factory for other types)

Resistance Effect: ............20µV per 10Ω of lead resistance.

Compensation (RJC): ........Automatic, ±0.1˚C/˚C

Input Protection: ..............25V AC/DC

Normal Mode Rejection: ..>40dB above 50Hz
Common Mode Rejection:..±4V referred to power supply ground.

Conformity Error:..............±(2˚C + 1 Digit) typical

±(4˚C + 1 Digit) maximum

±(3˚F + 1 Digit) typical
±(5˚F + 1 Digit) maximum

Resolution: ........................1˚C or 1˚F

Warm-up Time: ..................One minute to specified accuracy.

Conversion Rate: ..............3 readings per second

Display:..............................0.48" Liquid Cr ystal Display (LCD)

"Display Hold" & ˚C/˚F descriptor.

Over-range Indication:......Most significant "1" digit and polar ity sym-

bol are displayed with all other digits
blank.

Power Supply: ..................+4.75 to +5.25V DC at 40mA

Operating Temperature:....-20˚C to +50˚C

Storage Temperature: ......-20˚C to +70˚C

Relative Humidity: ............95% (non-condensing)

Case Dimensions: ............Bezel 2.76” X 1.17” (69.75 X 29.7mm)

Depth behind Bezel 3.32” (84mm) plus

0.68” (17.27mm) for connector

Weight: ..............................156 gms (5.5 oz) when packed

'J' Thermocouple

'K' Thermocouple

TM-35JC..............3.5 digit LED-Type J °C Thermocouple, 5VDC Pwr

TM-35JF ..............3.5 digit LED-Type J °F Thermocouple, 5VDC Pwr

TM-35KC..............3.5 digit LED-Type K °C Thermocouple, 5VDC Pwr

TM-35KF ................3.5 digit LED-Type K °F Thermocouple, 5VDC Pwr

TM-35XJC ............3.5 digit LCD-Type J °C Thermocouple, 5VDC Pwr

TM-35XJF............3.5 digit LCD-Type J °F Thermocouple, 5VDC Pwr

TM-35XKC............3.5 digit LCD-Type K °C Thermocouple, 5VDC Pwr

TM-35XKF..............3.5 d ig i t LCD-Type K °F Thermocouple, 5VDC Pwr

General Features

Typical Application Connections

Texmate’ s popular TM-35 Series of 5V DC powered temper ature
meters are available with an LED or LCD display.

The meters are supplied factory-configured either for ‘J’ or ‘K’
thermocouples, and scaled for ˚C or ˚F. On site re-scaling for ˚C
or ˚F is possible. A selectable ˚C/˚F descriptor is included with
every meter. The unique differential input configuration facili­tates operation with both grounded and ungrounded probes and
allows several meters, operating with grounded thermocouples,
to be powered by the same non-isolated 5VDC supply.

The standard meter is provided with TB-KIT screw terminal
blocks and insulated quick- disconnects. For the greatest con­venience and ease of use, order the optional preconfigured
Push-On screw terminal connectors. (see Push-On Screw
Terminals and Ordering Information on pages 3 & 4)

Meter 1

Meter 2

Meter 3

Hot Junction 1 Hot Junction 2

Hot Junction 3

H/T

T+

T-

+5V

GND

5VDC

H/T

T+

T-

+5V

GND

H/T

T+

T-

+5V

GND

Vessel Wall

The unique differen­tial input of the TM­35 Series enables
the use of grounded
thermocouples by
several meters pow­ered from the same
5V DC supply.

Single-Ended Input

For optimum noise
reduction, either the
+ or - lead of the
thermocouple should
be connected to
power supply ground.

Differential Input with Grounded Thermocouples

For additional connection information see page 3.

TM-35 Series LED Displays TM-35 Series LCD Displays

SLIM

BEZEL

The TM-Series is shipped in a standard Slim
Bezel case. The Slim Bezel case is compatible
with the CM, SM, PM, & SP Series of meters.
The TM-Series can be ordered in End Mount
cases for twin mounting or combinations of mul­tiple center mount cases and two end mount
cases for stack mounting.

TM-Series

5V DC

H/T

T+

T-

+5V

GND

TM-35

Zero Offset

Span

Linearity

Texmate, Inc.Tel. [phone] • www.texmate.comPage 2

September 10, 2003 TM-35X DS (TM08)

The Texmate TM-35X interconnects using the screw terminal blocks
supplied with the meter. Alternatively a standard PC board edge con­nector may be used, having two rows of 10 pins each, spaced on 0.156"
centers. Connectors are available from Texmate or from almost any
connector manufacturer.

Pins (A,B) & (1,2) - Display Test/Display Hold Input:All numeric dis­play segments will operate when Pins (A,B) & (1,2) are connected to
+5VDC System Power Input Pins (H,J) & (7,8).
CAUTION: This Display Test function is only intended for momentary
operation. Continuous operation of Display Test will in time damage the
display.
The function of this input may be re-configured to operate as Display
Hold by scraping off the fine track adjacent to Pin 1 (re-bridge, if
required, at the solder junction). To initiate Display Hold, connect Pins
(A,B) & (1,2) to +5VDC Power Supply Input Pins (H,J) & (7,8) and the
meter will latch up; A/D conversions will continue but the display will not
be updated until Pins (A,B) & (1,2) are released.
Pins (C,D) & (3,4) - Thermocouple Positive Input:The thermocouple
positive output is applied to these pins (refer to Table 2 for color codes).
Maximum overvoltage protection is 25V AC/DC.
Pins (E,F) & (5,6) - Thermocouple Negative Input: The thermocouple
negative output is applied to these pins (refer to Tab le 2 for color codes).
Maximum overvoltage protection is 25V AC/DC.
Pins (H,J) & (7,8) - +5VDC System Power Input: The meter requires
a regulated low-ripple 5VDC power supply applied to these pins.
Pins (K,L) & (9,10) - Power Supply Ground: Power supply ground
return.

H/T

H/T

T+

T+

T- T-

+5V +5V

GND

GND

1
2
3

4

5

6
7

8
9

A
B

C
D

E
F
H
J

K

L

1

2

3456789

ABCD

EFHJK

L

10

10

METER REAR WITH PCB EDGE CONNECTOR MOUNTED

Display Test/

Hold Input

Thermocouple

Positive Input

Thermocouple

Negative Input

+5VDC System

Power Input

Power Supply

Ground

Display Hold/
Test Input

Thermocouple
Positive Input

Thermocouple
Negative Input

+5VDC System
Power Input

Power Supply
Ground

Fine "Scrape Off" Tracks Solder Junction

Zero Offset

Span Linearity

COMPONENT SIDE PINS

SOLDER SIDE PINS

Ω

C13

0.1

µ

COMPARATOR

R7, 100k C8, 100pF

Ω

ZERO
OFFSET

R14

2.49k

ΩR92.49k

Ω

SPAN

Ω

BUFFER

C12

+5V

T-

0.1µC5,

R4

1M

F

0.2 Fµ

C6,

1

µFC4

+1.2V Ref.

R10

Ω

R6, 270k

Ω

R1A, 309

R1B, 309

Ω

Ω

R18
R19

R20

VR1

1.2V

R15
2k

-10mV/˚KRJC Sensor

Ω

Ω

0.1µF

R23

R22

R32

R31

R29

R28

R27

R26

R30

R24

R25

R17
200

R16
619

DISPLAY

END

˚C/˚F

HEADER

(Bias and power supply connections

have been omitted for clarity)

LINEARIZATION CIRCUITRY - 'J' TYPE

(Dashed lines represent connections for 'K' type)

CLOCK OSCILLATOR

A/D CONVERTER

DC/DC CONVERTER

LCD DRIVER

OPEN

HOLD

CLOSED TEST

+5V

Power

Power

GND

H/T

↔

↔

T+

C11

0.22

µF

+1.2V Ref.

LINEARITY

CALIB. PT. 'A'

Close For
Hold/Test
Activation

INTEGRATOR

F

R8

40.2k

50k

Ω

Functional Diagram

Connector Pinouts

'J' Thermocouple Shown Below

Additional Components for 'K' Thermocouple Are Shown Shaded

ZERO OFFSET

SPAN

LINEARITY

R16 R31

R24

R28

R14

R9

R27

Calib. Pt. 'A' (R25)

R7 C8

R29

R26

R4

R32

R30

C5

R8
R6
C4

R22

C6

R23

VR1C13

R18

C12

R1A

C11

R1B

R20

R17

R19

R10

R15

Component Layout

Calibration Instructions

POINTS TO NOTE

The TM-35X has been factory calibrated for optimum performance and
should not normally require further calibration or adjustment.
If the need for on-site re-calibration is determined, follow the procedure
below and verify that the voltage and meter display are incorrect before
disturbing potentiometer settings.

Note: The potentiometer settings are sealed at the factory. Any
user modification of these settings may, at the discretion of
Texmate, void the warranty.

Re-calibration requires either a thermocouple simulator or a precision

GND

+5V

T-

T+

H/T

5V DC

THERMOCOUPLE

WIRES

COPPER

WIRES

MILLIVOLT

SOURCE

DISTILLED ICE WATER BATH

OR

ELECTRONIC ICE POINT REFERENCE

Signal Conditioning Components

Turn Clockwise to
Increase Reading

To the

Left Front

ZERO Potentiometer (Pot)

The ZERO pot is on the left (as viewed from the
back of the meter).Typically it enables the input
signal to be offset ±5% of full scale.

Turn Clockwise to
Increase Reading

To the

Right Front

SPAN Potentiometer (Pot)

The 15 turn SPAN pot is middle pot (as viewed
from the back of the meter).Typical adjustment is
20% of the input signal range.

Use to set voltage at
Calibration Point " A"

To the

Right Front

LINEARITY

LINEARITY Potentiometer (Pot)

The Linearity pot is used to set the voltage at
the calibration Point “A” and is located on the
right (as viewed from the back of the meter).
The Linearity Pot is adjusted at the factory and
does not normally need to be re-adjusted by
the user.

Normal
Disabled
Reverse

Polarity Display Header

This header allows the Polarity indication to be
displayed normally, displayed reversed or to be
disabled completely.

CAUTION:This meter employs high impedance CMOS inputs.Although inter-

nal protection has been provided for several hundred volt overloads, the meter
will be destroyed if subjected to the high kilovolts of static discharge that can be pro­duced in low humidity environments.Always handle the meter with ground protection.

Cut to disable “+” polarity indication

Texmate, Inc.Tel. [phone] • www.texmate.comSeptember 10, 2003 TM-35X DS (TM08) Page 3

'J'

'K'

Positive
Negative

Negative

Positive

BRITAIN

BS 1843

FRANCE

NF C42-323

GERMANY

DIN 43714

U.S.A.
ANSI/

MC964

JAPAN

JIS C 1610-

1981

Yellow

Yellow

Yellow

Yellow

Red

Black

Brown

Blue

Purple GreenBlue

Blue
Red

Red

Red

Red

Red

White

White

White

Yellow
Sheath

Blue

Sheath

GB

F

D

USA

JPN

Thermocouple Color Codes

The TM-35X may be configured for
single-ended operation by connect­ing the thermocouple positive or
negative input to power supply
ground.This configuration is recom­mended for operation using an
ungrounded (isolated) thermocou­ple.Note: This circuit is also suitable
for use with a grounded thermocou­ple, provided that the supply power­ing the meter is isolated with respect
to ground. In this case, a separate
5V supply should be used for each
meter, or the meter should be used
in a differential configuration.

The differential input feature of the TM-35X facilitates tempera­ture measurement using grounded thermocouples. In this con­figuration, an indirect ground return path is still required to pre­vent the common mode range of the inputs from being exceed­ed, but the circuit differs from the single-ended configuration in
that the power supply ground is connected to the thermocouple
junction common point, rather than to the thermocouple positive
or negative input on the meter. This avoids the introduction of
circulating currents in the thermocouple wires arising from
ground loops, which may otherwise result in erroneous or noisy
readings. Several meters may be cascaded in this configuration
all powered by the same 5V DC supply, as shown above.

Meter 1

Meter 2

Meter 3

Hot Junction 1 Hot Junction 2

Hot Junction 3

H/T

T+

T-

+5V

GND

5VDC

H/T

T+

T-

+5V

GND

H/T

T+

T-

+5V

GND

Vessel Wall

GND

+5V

T-

T+

H/T

5V DC

Single-Ended Meter

Differential-Input Meter

'J' Type

'K' Type

CF

760

42.922mV
0

0.000mV

760

42.922mV

1400

42.922mV
0

-0.885mV
1400

42.922mV

1260

50.990mV
0

0.000mV
1260

50.990mV

2300

50.990mV
0

-0.701mV
1990

44.645mV

T/C Simulator

Millivolt Source

Linearity (R17)

Calib. Pt.'A' = 1.000V

Zero Offset (R15)

Zero Adjustment

Span (R10)

Full Scale Adjustment

T/C Simulator

T/C Simulator

Millivolt Source

Millivolt Source

CF

°

°

°°

Calibration Instructions Continued

millivolt source, thermocouple reference junction, and an ice point ref­erence. A digital voltmeter is also required. The calibration arrange­ment used should completely simulate normal thermocouple connec­tions to the meter.The drawing below illustrates the connection details
when using a millivolt source and an ice point reference.

Before calibration, determine the values for linearity, zero offset, and
span adjustment from the table.As an example, the values appropriate
for a TM-35XJC ('J' thermocouple, °C scaling) are: 760° (linearity), 0°
(zero offset), and 760° (span). Having determined these values, follow
the steps described below:

NOTE: For re-scaling between ˚C/˚F,linearity re-calibrated (Step 1)
may be omitted.

1. Calibrate the LINEARITY

Apply the linearity calibration voltage to the TM-35X.Connect the volt­meter to calibration point 'A' (shown on the component layout). Adjust
the LINEARITY potentiometer (R17) until the voltage at point 'A' is
exactly 1.000V.

2. Calibrate the ZERO OFFSET

Apply the zero offset calibration voltage to the TM-35X . Adjust the zero
offset potentiometer (R15) to make the meter display zero. The optimal
setting is achieved when the polarity sign alternates between '+' and '-'.

3. Check the Calibration

Apply the span calibration voltage to the TM-35X. Adjust the span
potentiometer (R10) until the meter display matches the value shown in
table one.

4. Program the °C/°F Descriptor

Refer to the "Descriptor Re-Programming" procedure below. This
should only be necessary if the meter is re-scaled between °C and °F.

CALIBRATION

Separate potentiometers are provided for adjustment of linearity, zero
offset, and span.Calibration involves the application of various voltages
representing temperatures according to the thermocouple type and
meter scaling.These values are summarized in the table below in terms
of temperature and equivalent thermocouple voltage output.

Push-On Screw Terminals

They provide the greatest convenience and ease of use

Texmate’s exclusive optional Push-On Connectors combine an
edge card connector and a 10 position screw terminal block.
Push-On Connectors are ordered preconfigured for each spe­cific power supply voltage and each optional power supply
available for the TM-Series.

Part Number: CN-PUSH/TM

TB-Kit Screw Connectors

Texmate’s individual screw terminal
blocks offer a con v enient alternative
to edge connectors for many appli­cations, allowing complete installa­tion, configuration and calibration
without the need for soldering.

Slide each terminal block over the

PCB until the hole aligns. Inser t the retaining screw to secure.
Each kit includes: 3 plastic blocks with metal contacts, 4 screws

with spade connectors, 1 metal contact and 3 quick disconnects.

TB-KIT
included

Texmate, Inc.Tel. [phone] • www.texmate.comPage 4

September 10, 2003 TM-35X DS (TM08)

Ordering Information

TM Case Dimensions and Panel Cutouts

OPTIONAL TWIN MOUNTING OR
MULTIPLE ARRAY CASES

The Slim Bezel Case is supplied as standard. If specified at time of ordering, any combination of Twin Mounting and
Multiple Array Cases may be substituted at no additional cost. Extra cases may be ordered separately.

Insert DPM through cutout hole from front of
panel.Attach mounting brackets and screws as
shown, using second slot when panel thick­ness is greater than 1/4 inch. Tighten screws
against rear of panel.

CENTER MOUNT CASE

Any number of Center Mount cases
may be fitted between two End Mount
cases for multiple arrays.
Par t No. CM-CASERED for LED's

CM-CASECLR for LCD's

SLIM BEZEL CASE

Standard Black ABS case with matte finish bezel for single
unit mounting.
Par t No. SL-CASERED for LED's

SL-CASECLR for LCD's

END MOUNT CASE

Same styling as Slim Bezel case but with bottom edge of
bezel removed.Two End Mount cases can be twin mounted
in a single cutout.
Par t No. EM-CASERED for LED's

EM-CASECLR for LCD's

1.17"

(29.7mm)

1.07"

(27mm)

0.97"

(24.5mm)

STANDARD SLIM BEZEL CASE

Standard Options for this Model Number

Part Number Description List

BASIC MODEL NUMBER Includes plug in type screw terminals,

standard display and standard power supply.

TM-35XJC..........3.5 digit LCD-Type J °C Thermocouple, 5VDC Pwr . . . . . .$104

TM-35XJF ..........3.5 digit LCD-Type J °F Thermocouple, 5VDC Pwr . . . . . .$104

TM-35XKC..........3.5 digit LCD-Type K °C Thermocouple, 5VDC Pwr . . . . . .$104

TM-35XKF..........3.5 digit LCD-Type K °F Thermocouple, 5VDC Pwr . . . . . .$104

Special Options and Accessories

Part Number Description List

ACCESSORIES

CN-L10 . . . . . . . . . .Edge Connector with Solder eyelet, 10 Pin Dual . . . . . . . . . .$3

TB-KIT . . . . . . . . . . . . . .Replacement Terminal Block Connector Kit (3) . . . . . . . . . . . . . . . . . . .$1

SL.CASECLR . . . . . .Slim Bezel Case, Clear Faceplate w/Mtg Hrdwre . . . . . . . . . .$6

CM.CASECLR . . . . .Ctr. Mount Case, Clear Faceplate w/Mtg Hrdwre . . . . . . . . . .$6.50

EM.CASECLR . . . . .End Mount Case, Clear Faceplate w/Mtg Hrdwre . . . . . . . . . .$6.50

Prices subject to change without notice.

PCB Edge Connector

A standard 20-pin edge connector (two rows of 10 pins on

0.156" centers) is used to connect all TM-35X meters. Order
part no. CN-L10.

Optional PCB Edge Connector

WARRANTY

Texmate warrants that its products are free from defects in material and workmanship under
normal use and service for a period of one year from date of shipment. Texmate’s obligations
under this warranty are limited to replacement or repair, at its option, at its factory, of any of the
products which shall, within the applicable period after shipment, be returned to Texmate’s facil­ity, transportation charges pre-paid, and which are, after examination, disclosed to the satis­faction of Texmate to be thus defective. The warranty shall not apply to any equipment which
shall have been repaired or altered, except by Texmate, or which shall have been subjected to
misuse, negligence, or accident. In no case shall Texmate’s liability exceed the original pur­chase price. The aforementioned provisions do not extend the original warranty period of any
product which has been either repaired or replaced by Texmate.

USER’S RESPONSIBILITY

We are pleased to offer suggestions on the use of our various products either by way of print­ed matter or through direct contact with our sales/application engineering staff. However, since
we have no control over the use of our products once they are shipped, NO WARRANTY
WHETHER OF MERCHANTABILITY, FITNESS FOR PURPOSE, OR OTHERWISE is made
beyond the repair, replacement, or refund of purchase price at the sole discretion of Texmate.
Users shall determine the suitability of the product for the intended application before using,
and the users assume all risk and liability whatsoever in connection therewith, regardless of any
of our suggestions or statements as to application or construction. In no event shall Texmate’s
liability, in law or otherwise, be in excess of the purchase price of the product.

Texmate cannot assume responsibility for any circuitry described. No circuit patent or software
licenses are implied.Texmate reserves the right to change circuitry, operating software, speci­fications, and prices without notice at any time.

For product details visit www.texmate.com

Local Distributor Address

995 Park Center Drive • Vista, CA 92081-8397
Tel: [phone] • USA 1-800-839-6283 • That’s 1-800-TEXMATE
Fax:[phone] • Email: [e-mail] • Web: www.texmate.com

Texmate has facilities in Japan, New Zealand, Taiwan, and Thailand. We also have
authorized distributors throughout the USA and in 28 other countries.

(84mm)

0.68"

(17.22mm)

(101.6mm)

3.32"

2.26"

(57.4mm)

(69.75mm)

2.55"

(64.8mm)

0.97"

(24.6mm)

Front Panel Cutout

4"

0.96"

(24.4mm)

1.17"

(29.7mm)

0.95"

(24.23mm)

0.304"

(7.72mm)

0.19"

(4.88mm)

(64.2mm)

2.76"

0.58"

(14.71mm)

2.52"

Copyright © 2003 Texmate Inc. All Rights Reserved.