DTM 995
LCD Type K Thermocouple Indicator
This meter will give a direct reading in °C from a K type (chromel-alumel) thermocouple sensor. The circuit uses a converter/amplifier
which has Cold Junction Compensation. Calibration is by two 20-turn cermet potentiometers which allow sensitive adjustment of the
instrument. The meter can also operate without a thermocouple to read room temperature. The meter is housed in a robust carrier,
which can be bolted in place or panel mounted using the low profile bezel, window and clips provided. The meter can also be backlit for
use in poor visibility.
19mm (0.75“) Digit Height
Cold Junction Compensation
Simple Connection
LED Backlighting
CALIBRATION
1.
Place thermocouple at 0°C and adjust OFFSET to
read 000.
Place thermocouple at known reference
temperature, eg. 100°C and adjust CAL
to read 100.
Repeat steps 1 and 2 until there are no more
adjustments of CAL and OFFSET required to
give desired readings.
Standard Meter
Stock Number
DTM 995
Specification
2.
Accuracy (overall error)
***
Thermocouple measurement range
Power supply voltage (V+ to V-)**
Operating temperature range *
Temperature stability
Supply current
Supply current with backlighting
Min.
-50
-58
7.5
0
Typ.
1
Max.
+600
+1112
24
50
0.05
Unit
% (±1 count)
°C
°F
V
°C
°C/°C
mA
mA
9.0
3.
3.5
55
In room temperature application adjust CAL to give the
same reading as a known temperature reference.
* Module temperature
** 5V supply option available - Contact Sales for details
*** To ensure maximum accuracy, re-calibrate periodically
CONNECTOR SOURCING GUIDE
SAFETY
METHOD
Screw Terminals - No Connector Required
The user must ensure that the incorporation of the DPM into the user’s equipment conforms to the relevant sections of BS EN 61010 (Safety Requirements
for Electrical Equipment for Measuring, Control and Laboratory Use).
DIMENSIONS
All dimensions in mm (inches)
76.0 (2.99)
72.5 (2.85)
a
a. 1.0 (0.04)
b. 2.0 (0.08)
c. 6.5 (0.26)
d. 11.5 (0.45)
e. 13.0 (0.51)
44.0 (1.73)
40.5 (1.59)
51.0 (2.01)
b c
24.0 (0.94)
Panel cut-out 72 x 40 (2.83 x 1.57)
Maximum panel thickness 3mm (0.12).
61.5 (2.42)
51.0 (2.01)
d
Ø5.7
(0.22)
e
CAL OFFSET
39.0 (1.54)
24.0 (0.94)
24.5 (0.96)
T- (blue)
T+ (brown)
REAR
VIEW
2
LP+
LP-
71.5 (2.81)
Ø3.0
(0.12)
ON-BOARD SOLDER LINKS
www.lascarelectronics.com
V+
3
V-
LASCAR ELECTRONICS LTD.
MODULE HOUSE, WHITEPARISH,
WILTSHIRE SP5 2SJ UK
TEL: +44 (0)1794 884567 FAX: +44 (0)1794 884616
E-mail: sales@lascar.co.uk
LASCAR ELECTRONICS INC.
LASCAR ELECTRONICS (HK) LIMITED
PO Box 770, Londonderry, NH 03053
LUCKY FTY. bldg., 63-65 HUNG TO ROAD
1-800-821-0023
3750 West 26th Street,
FLAT C, 5/FL.,
Erie, PA 16506 USA
KWUN TONG, KOWLOON, HONG KONG
www.martelcorp.com
838 8141
TEL: +1 (814) 835 0621 FAX: +1 (814)
TEL: +852 2797 3219 FAX: +852 2343 6187
E-mail: us-sales@lascarelectronics.com
E-mail: b4lascar@samsongroup.com.hk
PIN FUNCTIONS
1.
2.
3.
4.
5.
6.
V+
V-
T+
T-
LP+
LP-
Positive power supply connection.
Negative power supply connection.
Connection for positive (Ni-CR) part of thermocouple Green (Brown).
Connection for negative (Ni-AL) part of thermocouple White (Blue).
Positive power supply for backlighting.
Negative power supply for backlighting.
Note
- When connecting thermocouples, ensure that the wires are carefully cleaned and are connected directly to the module and not to some
intermediate connector other than a proper K type thermocouple extension cable.
ROOM TEMPERATURE METER
To use the internal temperature sensor, simply apply a short circuit to T+/T- (LK2).
VARIOUS OPERATING MODES
ON-BOARD LINKS: In order to quickly and easily change operating modes for
different applications, the meter has several on-board links. They are designed
to be easily opened (cut) or shorted (soldered).
Ensure thermocouple probes are isolated.
Normally
SHORT
Cut to OPEN
Normally
OPEN
Solder to
SHORT
BACKLIGHTING
There are two ways to power the LED backlight. Either use a 5V (±10%) supply on LP+/LP- or use the internal meter 5V supply. If the internal
supply is used, the power supply voltage is limited to 7.5 - 15V D.C.
THERMOCOUPLE MEASUREMENT
7.5 - 24V d.c.
7.5 - 15V d.c.
ROOM TEMPERATURE
MEASUREMENT
1
V+
T+
3
7.5 - 15V d.c.
1
V+
+5V
5
LP+
1
V+
T+
3
3
+
3
k-type
thermocouple
6
LP-
+
3
k-type
thermocouple
6
LP-
T+
3
Wire
Link
0V
6
LP-
T-
0V
2
0V
4
-
0V
2
T-
4
-
0V
2
T-
4
0V
0V
With external backlight supply.
With internal (continuous) backlight
supply. Short link 3.
With internal (switched) backlight
supply. Short link 3.
Note:
For thermocouple colour coding, refer to FAQ on our website.
PANEL FITTING
Specifications liable to change without prior warning
DTM 995
Issue 9
August/2002
M.C.
Applies to DTM 995/2
Embedded System
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