Martel Electronics DTM995 User Manual
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.
Standard Meter DTM 995
Stock Number
Specification Min. Typ. Max. Unit
2. Place thermocouple at known reference
temperature, eg. 100°C and adjust CAL
to read 100.
3. Repeat steps 1 and 2 until there are no more
adjustments of CAL and OFFSET required to
give desired readings.
In room temperature application adjust CAL to give the
same reading as a known temperature reference.
Accuracy (overall error) *** 1 % (±1 count)
Thermocouple measurement range
-50 +600 °C
-58 +1112 °F
Power supply voltage (V+ to V-)** 7.5 9.0 24 V
Operating temperature range * 0 50 °C
Temperature stability 0.05 °C/°C
Supply current 3.5 mA
Supply current with backlighting 55 mA
* Module temperature
**
5V supply option available - Contact Sales for details
*** To ensure maximum accuracy, re-calibrate periodically
CONNECTOR SOURCING GUIDE
SAFETY
The user must ensure that the incorporation of the DPM into the user’sequipmentconformstothe 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)
Screw Terminals - No Connector RequiredMETHOD
44.0 (1.73)
39.0 (1.54)
40.5 (1.59)
24.0 (0.94)
24.0 (0.94)
51.0 (2.01)
61.5 (2.42)
51.0 (2.01)
71.5 (2.81)
Ø5.7
(0.22)
24.5 (0.96)
Ø3.0
(0.12)
c
b
Panel cut-out 72 x 40 (2.83 x 1.57)
Maximum panel thickness 3mm (0.12).
d
e
OFFSET
CAL
www.lascarelectronics.com
REAR
VIEW
2
V-
V+
T+ (brown)
T- (blue)
LP-
LP+
ON-BOARD SOLDER LINKS
3
LASCAR ELECTRONICS LTD.
MODULE HOUSE, WHITEPARISH,
TEL: +44 (0)1794 884567 FAX: +44 (0)1794 884616
WILTSHIRE SP5 2SJ UK
E-mail: sales@lascar.co.uk
PO Box 770, Londonderry, NH 03053 1-800-821-0023
www.martelcorp.com
LASCAR ELECTRONICS INC.
3750 West 26th Street,
TEL: +1 (814) 835 0621 FAX: +1 (814) 838 8141
Erie, PA 16506 USA
E-mail: us-sales@lascarelectronics.com
LASCAR ELECTRONICS (HK) LIMITED
FLAT C, 5/FL., LUCKY FTY. bldg., 63-65 HUNG TO ROAD
KWUN TONG, KOWLOON, HONG KONG
TEL: +852 2797 3219 FAX: +852 2343 6187
E-mail: b4lascar@samsongroup.com.hk
PIN FUNCTIONS
1. V+ Positive powersupplyconnection.
2. V- Negative powersupplyconnection.
3. T+ Connection for positive (Ni-CR) part of thermocouple Green (Brown).
4. T- Connection fornegative(Ni-AL)part of thermocouple White (Blue).
5. LP+ Positivepower supply for backlighting.
6. LP- Negative power supply for backlighting.
- When connecting thermocouples, ensure that the wires are carefully cleaned and are connected directly to the module and not to some
Note
intermediate connector other thanaproper K type thermocouple extension cable.
ROOM TEMPERATURE METER
Touse 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 ROOM TEMPERATURE
7.5 - 24V d.c.
1
V+
5
+5V
LP+
6
0V
LP-
With external backlight supply.
Note: For thermocouple colour coding, refer to FAQ on our website.
3
+
T+
3
4
T-
-
0V
2
0V
k-type
thermocouple
6
LP-
With internal (continuous) backlight
supply. Short link 3.
7.5 - 15V d.c.
1
V+
T+
3
T-
0V
2
0V
3
+
k-type
thermocouple
4
-
With internal (switched) backlight
supply. Short link 3.
MEASUREMENT
7.5 - 15V d.c.
1
V+
3
T+
3
6
LP-
4
T-
0V
2
0V
Wire
Link
PANELFITTING
Specifications liable to change without prior warning DTM 995 Issue 9 August/2002 M.C. Applies to DTM 995/2
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