Status Instruments DM640P, DM640TC Quick Manual

DM640P & DM640TC

BATTERY POWERED DIGITAL

THERMOMETERS

Designed, manufactured and supported by:

Green Lane, Business Park, Green Lane

Tewkesbury Glos. G20 8DE. UK

Tel: [phone] Fax: [phone]

Every effort has been taken to ensure the accuracy of this specification, however we do
not accept responsibility for damage, injury, loss or expense resulting from errors and
omissions, and we reserve the right of amendment without notice

Stock code 52-314-2394-01

1.0 DESCRIPTION

The DM640 series is a range of battery powered temperature indicators.
The DM640P accepts an RTD sensor.
The DM640TC accepts a thermocouple sensor.

The sensor type, temperature units and other flexible configuration settings are
selectable via a simple to use menu system, which is navigated by the use of three push­button keys located on the rear of the display. This is described over the page in detail.

The entire assembly is sealed into a cap that fits directly onto the SCH4 series of
connecting heads. Please refer to the SCH4 data sheet for further information.
ATEX approved versions will be available for hazardous, dust and gas areas.

2.0 RECEIVING AND UNPACKING

Please inspect the packaging and instrument thoroughly for any signs of transit damage.
If the instrument has been damaged, please notify your supplier immediately.

3.0 SPECIFICATION @ 20 °C

DM640P

Accuracy ± 0.2 °C ± 0.1% of reading (plus sensor error)
Resolution 0.1 °C (User configurable)
Measuring range (-100 to +800) °C
Stability Zero 0.01 °C / °C

Sensor 3 wire Pt100 to BS EN 60751(adjustable), or Ni120
Lead effect 10 Ω per leg insignificant effect
Units °C (default) or °F
Sensor type Pt100 (default) or Ni120

D2394-01-02 CN4435 DM640P & TC User Guide.doc

Email: [e-mail]

Span 0.005 %/°C

DM640TC

Accuracy ± 0.1 % of FS ± 0.5 °C (plus sensor error)
Resolution 0.1 °C (User configurable)
Measuring range See table
Stability Zero 0.02 °C / °C

Cold Junction Tracking ± 0.05 °C / °C
Units °C (default) or °F
Sensor type K (default),J,T,R,S,E,L,N,B

* For type R, S and B sensors, accuracy only applies between 800 and 1760°C

DM640 General

Display 4 digit LCD
Battery Standard ANSI AA ER14505: IEC ER6
Dimensions Diameter 14.5 mm, length 50.5 mm
Type 3.6 V Lithium Thionyl Chloride (2.4 Ahr)
Operating Current 80 µA average
Battery Life > 1 year @ 20 ° C
Ambient Temperature (-10 to 70) °C [Storage (-20 to 85)°C]
EMC Approval Tested to BS EN 61326
Mechanical Low profile SCH4 Head ABS, IP67 rating when used with base

Connection Sensor three way screw terminal block to accept 18-22 AWG

4.0 INSTALLATION AND WIRING

4.1 Configuration

Fit the battery as described in section 4.4, then follow the simple
configuration menus printed on the reverse side of this sheet. This
procedure can be performed with or without the sensor connected. Fit the correct units
legend to the front panel face.

4.2 Enclosure

The SCH4 case offers various options for sensor entry. Please refer to the SCH4 data
sheet for further details. The sensor may be fixed directly to the SCH4 housing, or
remotely connected using cable and gland. Cable length must be no greater than 10
metres to comply with CE certification. All external cabling/sensor entries must maintain
IP67 rating.

4.3 Wiring

DM640P Connection DM640TC Connection

Span 0.01 %/°C

Sensor Range (°C)

K -200 to 1370
J -100 to 1200

T -210 to 400
R* -10 to 1760
S* -10 to 1760

E -200 to 1000

L -100 to 600

N -180 to 1300
B* 0 to 1800

unit

wire

Use correct compensating wire

4.4 Battery

BATTERY WARNING

• Fire, explosion and severe burn hazard, DO NOT recharge, crush,

disassemble, heat above 100 °C (212 °F), incinerate or expose contents to
water.

• Never short circuit the battery.

• Disposal of the battery may be regulated by national and local regulations.

Please follow the instructions of the proper regulator.

To install the battery, first gain access to the battery by unscrewing the SCH4 cap
retaining the nut and removing the cap from the base. To remove the old battery, ease
out the positive end of the battery from the holder, using a screw driver blade. To fit the
new battery, insert battery negative into the spring contact end of the battery holder BH1,
then press the battery into place. Replace the cap and secure the nut. Listed below are
suitable
battery types.

Manufacturer Part Number Capacity Ahr

Saft LS-14500, LS-14500C 2.25/2.75
Xeno Energy XL-060F 2.4
Maxell ER6 2.0
Tadiran Tl-2100 2.1
RS 596-602 2.1
Tekcell SBAA11-TC 2.2

The DM640 devices monitor their batteries. When the battery approaches the end of its
lifetime (over 1 year under normal conditions), the display will toggle the message "LO
BAT".

5.0 MAINTENANCE

Apart from battery replacement this equipment requires no user
maintenance. If re-calibration is required, please contact your supplier for further
information. Under certain circumstances, it may be possible to
re-calibrate the device while it is in an application.

6.0 GENERAL RECOMMENDATIONS

Please observe the battery warning.

Ensure the instrument is installed with adequate protection against the
environment. IP67 rating must be maintained.

Avoid installing the equipment close to sources of extreme temperature and electrical or
electromagnetic interference.

Any cleaning of the instrument should be carried out using a mild detergent and a soft
cloth. No solvents or abrasive cleaner should be used.

7.0 ME CHANIC AL DET AIL

The example below shows an in-head indicator with rotating head
temperature sensor assembly.

8.0 CONFIGURATION MENUS

The two sections overleaf describe the menus accessible on (1) the DM640P, and (2) the
DM640TC.

85.0 mm

There are three buttons, which the operator must press in various

V

V

B

combinations in order to configure and/or calibrate the device. These
buttons are located on the underside of the indicator's circuit board.

CYC INC

8.8.8.8

DEC

8.1 DM640P CONFIGURATION MENU GUIDE

iewed from the front, the three buttons (CYCle ,
INCrement and DECrement ) are shown in
black and located as shown in the diagram to the
left. Pressing 2 buttons simultaneously causes
ENTer or ESCape actions.

Run-time

8.8.8.8

then

If no buttons are pressed for a minute or more, the device
assumes run-time mode. The LCD shows the temperature (if
the input is in range) or shows or to indicate
over/under range . In order to access menu configuration
mode, the user must press ENTer followed immediately
by CYCle . In order to exit the menu and return to run­time, a user must press ESCape .

tyPE

P100
NI20

USER

Choose RTD type. If

User is chosen, PT100

BS EN30751

linearisation is used, but

the 0ºC & 100ºC

calibration points are

shifted by a user-

configurable amount.

There are three buttons, which the operator must press in various
combinations in order to configure and/or calibrate the device. These
buttons are located on the underside of the indicator's circuit board.

CYC INC

8.8.8.8

DEC

When cycling around the menu, the title
(e.g. type, UNIT , etc.) is displayed for
some time. To edit the chosen
parameter, the user should press
INCrement
or DECrement

UNit

de9C
de9F

Choose

temperature

units

See application note (available from www.status.co.uk) for more details regarding Pt100 offset/scale

adjustment, in-the-field re-calibration, resetting to factory default, and bypassing a forgotten menu passcode.

PTO for details of device specification, wiring connections and other important information.

processing stage where
electrical input has been

temperature is offset by

8.1 DM640TC CONFIGURATION MENU GUIDE

iewed from the front, the three buttons (CYCle ,
INCrement and DECrement ) are shown in
black and located as shown in the diagram to the
left. Pressing 2 buttons simultaneously causes
ENTer or ESCape actions.

OFSt

88.88

After the input

linearised to produce a

temperature, the

the number entered

here.

then

CYCle around menu

Choose the position of

the decimal place in

Run-time

8.8.8.8

dECP

8888.

888.8

88.88

8.888

run-time.

INCrement menu entry

DECrement menu entry

ENTer to confirm entry, or:

CYCle to reject and move on.

PASS

88.88

tOUt

60S
HOUr

If non-zero, the user
will be prompted for
this number in order

to enter the menu

from run-time.

If no buttons are pressed for a minute or more, the device
assumes run-time mode. The LCD shows the temperature (if
the input is in range) or shows or to indicate
over/under range . In order to access menu configuration
mode, the user must press ENTer followed immediately
by CYCle . In order to exit the menu and return to run­time, a user must press ESCape .

The device will return

from menu- mode to

run-time if no button is

pressed for the time

selected here.

When cycling around the menu, the title
(e.g. type, UNIT , etc.) is displayed for
some time. To edit the chosen
parameter, the user should press
INCrement
or DECrement

tyPE

Ca

J
T
R
S
E
L
N

Choose TC type.

D2394-01-02 CN4435 DM640P & TC User Guide.doc

CYCle around menu

UNit

de9C

OFSt

88.88

de9F

Choose

temperature

units

See application note (available from www.status.co.uk) for more details regarding Pt100 offset/scale

adjustment, in-the-field re-calibration, resetting to factory default, and bypassing a forgotten menu passcode.

PTO for details of device specification, wiring connections and other important information.

After the input
processing stage where
electrical input has been

linearised to produce a

temperature, the

temperature is offset by

the number entered

here.

dECP

8888.

888.8

88.88

8.888

Choose the position of

the decimal place in

run-time.

INCrement menu entry

DECrement menu entry

ENTer to confirm entry, or:

CYCle to reject and move on.

PASS

88.88

If non-zero, the user
will be prompted for
this number in order

to enter the menu

from run-time.

tOUt

60S
HOUr

The device will return

from menu- mode to

run-time if no button is

pressed for the time

selected here.