Gems Sensors & Controls DM28 Operating Manual

Introduction

Your Gems Sensors DM28 DC Process is one model in a family of 1/8 DIN units
which offers breakthrough display technology as well as easy-to-program single-line
parameters. Designed to provide instant visual feedback regarding an application’s
key input value, the DM28 not only has a 0.71” high LED display (27% larger than
other 1/8 DIN units), but also the ability to change display color based on process
status (programmable parameter in Operation Mode). Easy programming is made
possible via a help function and a secondary legend display.

This manual will guide you through the installation and wiring of your DM28 unit
with information on proper panel mounting and rear ter minal layout and wiring
instructions. In addition, the instrument’s operation, programming, and
configuration modes are thoroughly explained. The Operation Mode provides day to
day operation and allows editing of preset values. The Program Mode enables the
configuration of various parameters prior to initial operation. These parameters
include those for basic configuration as well as other settable features which will
enhance the functionality
and usability of the device.
The Configuration Mode
allows selection of how
outputs and special
functions are utilized.

Technical Manual

This manual also provides
information on the DM28 DC
Process' alarms; transistor,
relay, and linear outputs;
product specifications; and
ordering and warranty
procedures.

Features

• 0.71” high digit LED display

• Programmable color change display based
on an event

• Programmable help function and secondary
legend display

• High and low alarm outputs

• mA inputs to 50mA, DCV inputs to ±10
Volts and ±100 mV

• Tare function

• Standard outputs: two NPN transistors &
one relay (optional 2nd relay)

• 100 ms sample time with 0.03% accuracy

• CE approved

Index

Installation

Panel Mounting page 2
Wiring page 3

Operation

Front Panel page 4
Operation Mode page 5-6

Programming

Program Mode page 7-10

Configuration

Configuration Mode page 11-14

Appendix A

Specifications page 15

General

Ordering Information page 16
Warranty page 16

182016

DM28-2XXXX
DC Process

INSTALLATION

PANEL MOUNTING

Gems Sensors

OP1
OP2

48mm

82344

100mm

Mounting Grooves

96mm

PGM

RST

92mm +0.5 -0.0

CUTOUT

14 15 16 17 18 19 20

10 11 12

10mm

PANEL

45mm

+0.5 -0.0

SIZE

The instrument can be mounted in a panel with a thickness of up to 6mm. The
cutout(s) should be made based on the recommended panel opening illustrated in the
drawing above.

Insert the unit in the panel through the cutout. Ensure that the
panel gasket is not distorted and the instrument is positioned
squarely against the panel. Slide the mounting clamp into place
on the instrument, as shown to the left, and push it forward until
it is firmly in contact with the rear face of the mounting panel and
the tabs on the bracket arm are seated in the mounting grooves
on the side of the unit.

22

23

24

2

345 678

The electronic components of the instrument can be removed from
the housing after installation without disconnecting the wiring.
To remove the components, grip the side edges of the panel and
pull the instrument forward. Take note of orientation of the unit
for subsequent replacement in the housing.

Bracket Arm

2

INSTALLATION

WIRING

REAR TERMINAL CONNECTIONS

Digital Input

B A

45678

Relay 1

3

22
23

24

2

Relay 2

Linear
Output

Power Supply

+

-

14 15 16 17 18 19 20

10 1 1 12

Control/Digital Inputs

A digital input board, which utilizes Terminals #16 &
#17, can be installed as an option. The input can be
programmed in Configuration Mode to perform one of
two functions:

NPN Out 2

Common

NPN Out 1

Aux. Po wer +

Aux. Power -

V +

mV / mA +

mV / V / mA -

- Tare: When activated, the unit will create an
automatic offset by referencing the currently

Transistor Outputs

Your unit comes standard with 2 NPN outputs which are activated by
each of the alarms. Transistor Output 1, which is tied to Alar m 1, is
on Terminal #7. T ransistor Output 2, which is tied to Alarm 2, is on
Terminal #9. Ter minal #8 serves as the common connection for both
transistor outputs.

Input Power

For an AC powered unit, Terminal #13 serves as the line or Hot side

measured value as the new zero point.

- Security: When activated, the Program Mode
will not be accessible from the front
panel.

connection for AC powered units and as the positive side for DC

Relay Outputs

Your unit comes standard with a relay output which is tied to Alarm

powered units. The neutral side for AC powered units and the
negative side for DC powered units are connected to Terminal #14.

1. Terminal #19 is NC, Ter minal #20 is common, and Terminal #21
is NO. A second relay output tied to the operation of Alarm 2 can be
added as an option at the time of order or later installed in the field.
Terminal #22 is NC, Ter minal #23 is common, and Terminal #24 is
NO.

DC Inputs

Your unit accepts millivolt, Volt, or milliamp DC ranges. Terminal

Linear Output

An option board may be installed that provides a 10 bit linear output
signal relative to the Process Value. Terminal #12 is the positive side
of the connection, and Terminal #10 is the negative side. The default
range of the output is 4-20 mA, but can be changed via the
Configuration Mode to 0-20 mA, 0-10 VDC, 2-10 VDC, 0-5 VDC, or 1-

5 VDC.
#1 is used for mV, V, or mA negative inputs. Terminal #2 is used for
V positive inputs, while Terminal #3 is used for mV or mA positive
inputs.

Meter

Meter

6
2
5
1

6
3
1
5

Exc
Out

Common

Jumper

Jumper

3 -Wire

Voltage

Sensor

+

2 -Wire

­ 4-20 mA

Transmitter

Terminals 4, 11, & 15 are not used.

3

OPERATION

FRONT PANEL

Gems Sensors

Output Indicators

OP1
OP2

82345

PGM

Down Key Scroll Key Program Key Reset Key

Key Functions

Key

Down

Scroll

Program In Operation Mode: Used to move between the process

Reset In Operation Mode: Resets a latched alarm if pressed

Down &

4

Scroll

In Operation Mode: Used in Edit Operation to
decrement the digit highlighted by the Scroll key.

In Program & Config. Modes: Used in Edit Operation to
decrement the digit highlighted by the Scroll key, if the
setting is a numerical value, or present the next in the
series of choices for that parameter .

In All modes: Moves the unit into Edit Operation,
which is indicated by the left most digit flashing.
Successive presses of the key are used to move to the
digit to be edited. Wrap around will occur from least
significant digit to most significant digit.

value display & the presets and to enter an edited
preset value. Holding the key down for 3 seconds will
cause the unit to enter Program Mode if not
disabled by digital input.

In Program Mode: Used to move from one parameter
to the next and enter the edited parameter values.
Holding the key down for 3 seconds will cause the unit
to return to Operation Mode.

In Config. Mode: Used to move from one parameter to
the next and enter the edited parameter values.

while the process value is being viewed. Pressing this
key while viewing the max, min, or elapsed time
value will cause those values to be reset.

In Program & Config. Modes: No function.
In All modes: Will abort an Edit Operation and return

the preset/parameter to its previous value.

Function

H

Secondary Display

Primary Display

RST

Key Functions

Key

Down &
Program

Key

Primary In Operation Mode: Default display is the Process

Secondary In Operation Mode: Provides an alpha or numeric

Output
Indicators

In Config. mode: Holding down both keys for 3 seconds
will cause the unit to return to Operation Mode.

In Operation & Program Modes: Holding down both
keys for 3 seconds will cause the unit to enter to
Config. Mode.

Display Functions

V alue. Can be scrolled using the program key to
display other Operation Mode values. If the "Help"
function is enabled, this display will first show the
parameter description for 3 seconds (example - page 6).

In Program & Config. Modes: Displays the value or
selection for the current parameter . If the "Help"
function is enabled, this display will first show the
parameter description for 3 seconds (example - page 7).

indentification of the value on the primary display.
This display is blank when the Process Value is being
shown.

In Program & Config. Modes: Provides a 1 digit alpha or
numeric character to indicate which parameter value is
being shown on the primary display.

In Operation Mode: Illuminates when Alarm 1 and
or Alarm 2 is active.

In Program & Config. Modes: No function.

Function

Function

OPERATION

OPERATION MODE

CHANGING A PRESET VALUE

Gems Sensors

Default display is the process value.

OP1
OP2

34567

RST

PGM

PGM

Gems Sensors

Proc

PGM

PGM

Gems Sensors

Hi

PGM

RST

H

RST

Pressing the Program Key will cause the

OP1
OP2

display description to appear on the
main display.* If there is no key activity
for 3 seconds, the primary display will
switch back to the process value.

Maximum (High) Value: Displays the

OP1
OP2

maximum process value the unit has
received as an input. The value can be
reset (only while being displayed) by
pressing the Reset Key.

Gems Sensors

AL 1

PGM

PGM

Gems Sensors

AL 2

PGM

PGM

2

1

RST

RST

Alarm 1 Value: Defines the process

OP1
OP2

value at or above which Alarm 1 will
activate if set to Process High Alarm in
Configuration Mode or the process value
at or below which Alarm 1 will be active
if set to Process Low Alarm in
Configuration Mode. The default value
is 100.00

Alarm 2 Value: Defines the process

OP1
OP2

value at or above which Alarm 2 will
activate if set to Process High Alarm in
Configuration Mode or the process value
at or below which Alarm 2 will be active
if set to Process Low Alarm in
Configuration Mode. The default value
is 100.00

Gems Sensors

Lo

Gems Sensors

PGM

PGM

PGM

PGM

PGM

L

RST

EEL ti

RST

Minimum (Low) Value: Displays the

OP1
OP2

minimum process value the unit has
received as an input. The value can be
reset (only while being displayed) by
pressing the Reset Key.

Alarm 1 Elapsed Time: Displays the

OP1
OP2

accumulated amount of time the alarm
1 condition was present. This value will
continue to accumulate until it is reset
by pressing the Reset Key (while the
value is being displayed). The value is
displayed in mm:ss up to 99 min 59
secs., then changes over to mmm.m

Gems Sensors

PGM

Total: Displays the total value based

OP1
OP2

upon integratation of the input signal

ttotAL

RST

using a programmable time base. The
value can be reset (only while being
displayed) by pressing the Reset Key.

* Parameter descriptions will not
appear on the primary display if the
"Help" function has been disabled.

5

OPERATION

OPERATION MODE Continued

OTHER OPERATING DISPLAYS

Gems Sensors

OuEr

PGM

RST

Over Range Display: Appears if the

OP1
OP2

process value becomes higher than the
input full scale value.

Gems Sensors

brEA/

PGM

RST

Sensor Break Display: Appears if the

OP1
OP2

unit does not receive an input signal for
two seconds.

Gems Sensors

UndEr

PGM

RST

Under Range Display: Appears if the

OP1
OP2

process value becomes lower than the
input full scale value.

CHANGING AN ALARM VALUE

Gems Sensors

Default display is the the Process Value.

OP1
OP2

34567

RST

PGM

5 Times

PGM

Gems Sensors

AL 1

PGM

RST

From the Process Value display, scroll

OP1
OP2

through the other Operation Mode
values until Alarm 1 appears.*

Gems Sensors

PGM

Gems Sensors

190.00

PGM

1100.00

RST

1

RST

Use the Scroll Key to move from left to

OP1
OP2

right and highlight the digit that needs
to be changed. Wrap around will occur
from the least significant to the most
significant digit.

Use the Down Key to decrement the

OP1
OP2

digit until the desired value appears.
The display will wrap around from 0 to

9.

Gems Sensors

100.00

6

PGM

1

RST

To change the Alarm value, press the

OP1
OP2

Scroll Key. If there was no key activity
for 3 seconds, the Alarm value will
appear (one digit description shown on
secondary display); however, press the
Scroll Key in order to edit. The unit will
now be in Edit Operation as signified by
the most significant digit flashing.**

PGM

Gems Sensors

190.00

PGM

PGM

1

RST

After the desired digits have been

OP1
OP2

changed, press the Program Key to enter
the new value. The new value will
appear on the main display without any
flashing digits. Press the Progam Key
again and the parameter description will
appear on the main display.*

* Parameter descriptions will not
appear on the primary display if the
"Help" function has been disabled.

** Edit Operation cannot be
accessed if the Alarm Lock
has been enabled in Program
Mode.

PROGRAMMING

PROGRAM MODE

ENTERING PROGRAM MODE AND BASIC OPERATION

The Program Mode can be accessed from the
Operation Mode by holding the Program Key
for 3 seconds.

The name of the first parameter will appear
on the primary display.*

Gems Sensors

34567

PGM

for 3 seconds

PGM

Gems Sensors

RST

ScA 1

RST

PGM

PGM

Successive presses of the Program Key will
scroll the display through the remaining
parameters in the Program Mode. To exit
Program Mode, hold the Program Key for 3
seconds.

Gems Sensors

* Parameter names will not appear on the
main display if the "Help" function has been
disabled in Program Mode.

Gems Sensors

diS 1

PGM

RST

OP1
OP2

Edit Operation

OP1
OP2

3 secs. or

PGM

Gems Sensors

0.00

PGM

1

RST

OP1
OP2

Pressing the Scroll Key or no key activity for
3 seconds will display the value for that
parameter. The secondary display will

OP1
OP2

indicate the one digit identifier for the
parameter . The digit in the secondary
display will flash to indicate the unit is in
Program Mode. If the Scroll Key was
pressed (instead of waiting 3 seconds), the
unit is in Edit Operation, as indicated by the
MSD flashing. If there had been no key
activity for 3 seconds, press the scroll key to
enter Edit Operation (MSD flashing). Use
the scroll and edit buttons to change the
value as in Operation Mode, described on
page 6. Press the Program Key to enter any
changes.

PARAMETER SEQUENCE

1

PGM

PGM

1

1

1.

ScA

diS

Scaling Point 1

Function: Sets the first sensor input value point (expressed as a % of input) which will be used in
establishing a curve for scaling sensor inputs into engineering unit values. Pressing the Reset Key will
serve as a teach function and input the sensor value currently being read

Adjustment Range: 0.00 to 100.00%
Default V alue: 0.00

Display Point 1

Function: Provides the engineering unit value that will be displayed corresponding to the sensor input value
set in the Scaling Point 1 parameter

Adjustment Range: -19999 to 99999
Default V alue: 0.00

7

PROGRAMMING

PROGRAM MODE Continued

Scaling Point 2

2

PGM

PGM

2

2

Function: Sets the second sensor input value point (expressed as a % of input) which will be used in
establishing a curve for scaling sensor inputs into engineering unit values. Pressing the Reset Key will
serve as a teach function and input the sensor value currently being read

Adjustment Range: 0.00 to 100.00%
Default Value: 100.00

Display Point 2

2.

Function: Provides the engineering unit value that will be displayed corresponding to the sensor input value
set in the Scaling Point 2 parameter

Adjustment Range: -19999 to 99999
Default Value: 100.00

ScA

diS

The scaling process can be repeated up to a total of 10 scale and display points.

Scale and display points will continue to be offered (up to 10 total) so long as 100.00 (the maximum adjustment range) has
not been selected as a scaling point value.

Application Example

Programming Scale and Display Points

Situation: The number of gallons contained in a cylindrical
tank with vertical sides is linearly related to the surface level.
The desired range of levels in the tank is 0 gallons minimum
and 400 gallons maximum. A 4-20 mA sensor is used to
indicate liquid level (the sensor provides a changing current
as the level changes). When the liquid level is at the 0 gallon
minimum, the sensor outputs 4 mA, and when the liquid level
is at the 400 gallon maximum, the sensor outputs 20 mA.

Parameter Entries:

Configuration Mode: Input - Select "2300"
Program Mode: Decimal Point - Select 0.00
Scaling Point 1: 0.00 (= 0% which corresponds to the 4 mA level)
Display Point 1: 0.00 (= 400 gallons which corresponds with Scaling Point 1)
Scaling Point 2: 100.00 (= 100% which corresponds to the 20 mA level)
Display Point 2: 400.00 (= 5 gallons which corresponds with Scaling Point 2)

400 GAL

200 GAL

0 GAL

➙

➙

20 FT

10 FT

➙

0 GAL

(4 mA)

(12 mA)

200 GAL

(20 mA)

400 GAL

Result: As the sensor output changes from 4 mA to 20 mA, the display will linearly read from 0 to 400.00 - indicating the amount of liquid in
the tank at any given moment. If under no load the meter does not read exactly zero, enter a process variable offset (Program Mode) value.
For example: Meter reads "3.2" enter "-3.2".

8

PROGRAMMING

PROGRAM MODE Continued

dEc

PGM

rt

rt

Lo

PGM

Hi

PGM

P

Decimal Position

d

L

H

Function: Sets the position of the decimal point for use in displaying the process and alarm values
Adjustment Range: 0 to 0.000
Default Setting: 0.00

Retransmission Scale Minimum

Configuration mode)
Function: Defines the lower end of the linear scale for the retransmission output by defining the value equated

to the minimum output signal

Adjustment Range: -19999 to 99999
Default V alue: 0.00

Retransmission Scale Maximum

Configuration mode)
Function: Defines the upper end of the linear scale for the retransmission output by defining the value equated

to the maximum output signal

Adjustment Range: -19999 to 99999
Default V alue: 100.00

(Appears only if a retransmission output has been enabled in

(Appears only if a retransmission output has been enabled in

oFF

PGM

Filt

PGM

Process Variable Offset

O

F

Function: Corrects a known offset of the input in order to more accurately display the process value
Adjustment Range: -19999 to 99999
Default V alue: 0.00

Input Filter Time

Function: Filters the input over a user definable time period to minimize the effect on the Process Value of

any extraneous impulses

Adjustment Range: 0.0 (Off) to 100.0
Default V alue: 2.0

9

PROGRAMMING

PROGRAM MODE Continued

Display Color Change

Color

o

Function: Defines the color of the display for prior to and after the preset value is reached
Adjustment Range:

PGM

Loc/

PGM

HELP

rEd

Red: The display will
always be red

Default Value: Gr een to Red

Alarm Lock

/

h

Function: Determines whether the Alarm Values can be changed via the front panel
Adjustment Range:

En

Enable: Alarm values are read only

Default Value: Disable

Help Prompt

Function: Determines whether the multi-character parameter name will appear on the main display for 3
seconds prior to the parameter value appearing

Adjustment Range:

GrEEn

Green: The display will
always be green

Gn_rd rd_Gn

Green to Red: The
display will be green
when no alarm condition
is present. It will turn
red when either alarm is
active

Disabled: Alarm values can be viewed and changed.

Red to Green: The
display will be red when
no alarm condition is
present. It will turn green
when either alarm is
active

diS

10

HLP

Help - Yes: Multi-character parameter descriptions will
appear on the primary display. The value associated
with that parameter will appear by pressing the scroll
key or waiting for 3 seconds

Default V alue: Help - Yes

Y

Help - No: Only the parameter values will appear on the
primary display. The parameter can be identified by a
single digit in the secondary display

HLP

N

CONFIGURATION

CONFIGURATION MODE

ENTERING CONFIGURATION MODE AND BASIC OPERATION

The Configuration Mode can be accessed
from the Operation Mode by holding the
Down and Program Keys for 3 seconds.
To exit do the same.

The name of the first parameter will appear
on the primary display.*

Gems Sensors

34567

PGM

PGM

Gems Sensors

OP1
OP2

RST

for 3 seconds

OP1
OP2

1nPut

RST

PGM

PGM

Successive presses of the Program Key will
scroll the display through the remaining
parameters in the Configuration Mode. To
exit Configuration Mode, hold the Down and
Program Keys for 3 seconds.

* Parameter names will not appear on the
main display if the "Help" function has been
disabled in Program Mode.

Gems Sensors

FrEQ

PGM

RST

OP1
OP2

3 secs. or

PGM

Edit Operation

Gems Sensors

2300

PGM

i

RST

OP1
OP2

Pressing the Scroll Key or no key activity for
3 seconds will display the value for that
parameter. The secondary display will
indicate the one digit identifier for the
parameter . The digit in the secondary
display will flash to indicate the unit is in
Configuration Mode. If the Scroll Key was
pressed (instead of waiting 3 seconds), the
unit is in Edit Operation, as indicated by the
MSD flashing. If there had been no key
activity for 3 seconds, press the scroll key to
enter Edit Operation (MSD flashing). Use
the scroll and edit buttons to change the
value as in Operation Mode, described on
page 6. Press the Program Key to enter any
changes.

PARAMETER SEQUENCE

1nPut

PGM

i

Input Range

Function: Selects the DC input range
Adjustment Range:

2200

2300

0-20 mA 4-20 mA 10-50 mA 0-5 Volts DC

3400

0-10 V olts DC

3500

2-10 V olts DC ±100 mV ±1 V olts DC

2400

2900

3200

3100

3300

1-5 V olts DC

3600

±10 V olts DC

11

CONFIGURATION

CONFIGURATION MODE Continued

Frequency

FrEQ

PGM

AL

1

1

Function: AC Power Supply frequency for the meter.
Adjustment Range:

Alarm 1 Type

Function: Sets the action of the alarm to one of the following choices:
Adjustment Range:

6050

AL

PGM

2

PGM

P_Hi

Process High: Alarm will
activate when the process
value equals or exceeds
the Alarm 1 setting

Default V alue: Process High Alarm

Alarm 2 Type

2

Function: Sets the action of the alarm to one of the following choices:
Adjustment Range:

P_Hi

Process High: Alarm will
activate when the process
value equals or exceeds
the Alarm 2 setting

Default V alue: No Alarm

P_Lo

Process Low: Alarm will
activate when the process
value equals or is less
than the Alarm 1 setting

P_Lo

Process Low: Alarm will
activate when the process
value equals or is less
than the Alarm 2 setting

nonE

No Alarm: Alarm 1 will
be inactive

nonE

No Alarm: Alarm 2 will
be inactive

12

CONFIGURATION

CONFIGURATION MODE Continued

Output 1 Usage

Out

1

U

Function: Determines how the transistor and relay for output 1 will operate
Adjustment Range:

Out

PGM

2

A1nd

Alarm 1, Non latching,
Direct Action: The output

will be On when Alarm 1
is active, and turn Off
once the Alarm 1
condition is no longer
present

012d

Logical OR of Alarm 1 & 2,
Direct Action: The output

will be On when a logical
OR condition between
Alarm 1 and Alarm 2 is
present

Default V alue: Alarm 1, Non latching, Direct Action

Output 2 Usage

u

Function: Determines how the transistor and relay for output 2 will operate
Adjustment Range:

A1nr

Alarm 1, Non latching,
Reverse Action: The

output will be On when
Alarm 1 is inactive, and
turn Off when the Alarm
1 condition is present

012r

Logical OR of Alarm 1 &
2, Reverse Action: The

output will be Off when
a logical OR condition
between Alarm 1and
Alarm 2 is present

A1Ld

Alarm 1, Latching, Direct
Action: The output will be

On when Alarm 1 is
active, and turn Off only
when reset via the front
panel

Alarm 1, Latching,
Reverse Action: The

output will be Off when
Alarm 1 is active, and
turn On only when reset
via the front panel

A1Lr

PGM

A2_d

Alarm 2, Direct Action:

The output will be On
when Alarm 2 is active,
and turn Off once the
Alarm 2 condition is no
longer present

Default V alue: Alarm 2, Direct Action

A2_r

Alarm 2, Reverse Action:

The output will be On
when Alarm 2 is inactive,
and turn Off when the
Alarm 2 condition is
present

012d

Logical OR of Alarm 1 & 2,
Direct Action: The output

will be On when a logical
OR condition between
Alarm 1 and Alarm 2 is
present

Logical OR of Alarm 1 &
2, Reverse Action: The

output will be Off when
a logical OR condition
between Alarm 1and
Alarm 2 is present

012r

13

CONFIGURATION

CONFIGURATION MODE Continued

Retransmission Output

rt

En

t

Function: Selects the range of the retransmission output
Adjustment Range:

PGM

OPtn

tot

nonE

None

Default Value: None

Option Selection

o

t

Function: Determines the function of the board installed in the option slot
Adjustment Range:

nonE

No Input Security: When the

Default V alue: None

Totalizer Scale Factor

Function: Sets the time base used for the totalization calculation. This value should be set the
same as the time base used for the engineering units which appear on the display. Ex: If the
display is calibrated to display GPM, set the Totalizer scale factor to minutes

Adjustment Range:

0-5u

0-5 V olts DC

0-20A

0-20 mA

SctY

digital input is active, the
Program and
Configuration Modes
cannot be accessed

1-5u

1-5 Volts DC

4-20A

4-20 mA

tArE

Tare: When the digital
input is activated the
currently measured value
is zeroed out and will
remain as a constant
offset

0-10u

0-10 V olts DC

2-10u

2-10 Volts DC

14

SEc

Seconds

Default Value: Seconds

<>in

hr

HoursMinutes

APPENDIX A

SPECIFICATIONS

Process Input

Range: To 50 mA, ±10 Volts DC, ±100 mV
Accuracy: + 0.01% of span
Sample Rate: 100 ms
Resolution: 14 bits
Sensor Break: Detected within 2 seconds

Control Inputs

Type: Sourcing, Edge Sensitive
Logic: Low < 2.0 VDC, High > 3.0
Impedance: 4.7 KΩ to +Voltage - Sourcing
Response Time: 25 ms
Function: Programmable

Outputs

Solid State: NPN open collector, 30 VDC max, 100 mA max.
Relay: SPDT, 5A resistive @ 110VAC
Latency: 75 µ seconds, plus 8 ms for relay pull-in

Linear Outputs

Ranges: 0-20mA, 4-20mA, 0-10V, 2-10V, 0-5V, 1-5V
Accuracy: ±0.25% (mA at 250Ω, V at 2kΩ);

degrades linearly to ±0.5%
Resolution: 8 bits in 250ms (10 bits in 1s typ.)
Update: Approximately 4/s
Load Impedence: mA Ranges: 500Ω max.; V Ranges: 500Ω min.

Electrical

Supply Voltage: 90-264 VAC, 50/60 Hz, or 20-50 VAC/VDC
Power Consumption: 4 Watts
Access. Power Supply:24 VDC @ 30 mA

Display

Type: Red/Green, 7 segment LED, 5 digits primary
Height: 0.71" (18mm) primary display,
Annunciators: Output 1 & 2 status

Physical

Dimensions: 48mm x 96mm, 110mm deep
Mounting: Panel mount (mounting bracket supplied),

Terminals: Screw type - combination head
Front Panel Rating: NEMA 4X/IEC IP65
Case Material: GE Lexan 940
Weight: 0.56 lbs.

Environmental

Operating Temp.: 0° to 55° Celsius, 32° to 131° Fahrenheit
Storgage Temp.: -20° to 80° Celsius, -4° to 176 ° Fahrenheit
Relative Humidity: 20% to 95% non-condensing

display, single digit secondary display

0.3" (7mm) secondary display

45mm x 92mm cutout

Approvals

General: CE
EMC Susceptibility: Complies with EN50082-1: 1992,

EN50082-1, 1995
EMC Emissions: Complies with EN50081-1: 1992,

EN50081-2: 1994
Safety: Complies with EN61010-1: 1993

15

GENERAL

ORDERING INFORMATION

DM28 - 2

2nd Relay Option
0 None
1 2nd Relay

Power Supply
0 90-264 VAC
2 20-50 VAC/VDC

Linear Output
Option
0 None
3 Linear Output

Serial Communication
Option
0 None
6 Digital Input

WARRANTY

Gems Sensors Inc., the seller, warrants its products to be free from defects in material and workmanship in normal use and service for a
period of one year from date of shipment. Gems reserves the right and option to refund the purchase price in lieu of repari or
replacement upon evaluation of the returned original part. Modification, misuse, attempted repair by others, improper installation or
operaiton shall render this guarantee null and void. Gems Sensors Inc. makes no warranty of merchantability or fitness for a part or
purpose.

Limits of Liability
In no circumstances shall Gems Sensors Inc. be liable for special, consequential or exemplary damages of any kind or character,

including contract tort, and strictly liability in tort and contract.
Equipment sold by Gems Sensors Inc. is not intended for use in a nuclear installation, nor shall it be used as a “Basic Component” as

same as deined under Part 21, Title 10 of the Code of Federal Regulations. In the event of such use, you agree to indemnify and hold us
harmless from any and all subsequent liabilities and responsibilities which might arise in connection with such use.

Returning Goods
Contact your local sales agent or the factories for return policy prior to sending back any product.

16

#182016
Revision: none

Gems Sensors Ltd.
Lennox Road
Basingstoke
Hants, RG22 4AW
Phone: [phone]
Fax: [phone]

Gems Sensors Inc.
1 Cowles Road
Plainville, CT 06062
USA
Phone: [phone]
Fax: [phone]