Detcon 840-RD User Manual

DETCON INCORPORATED

Model 840-RD Remote Display System

Operator Instruction Manual

February, 7.2005, Document # 3148, Rev # 0

 Detcon Incorporated

3200 Research Forest Dr, The Woodlands, TX 77381

Phone [phone] • Fax [phone]

Model 840-RD Operator Manual Rev. 0 ii

Table of Contents

1.0 Description.................................................................................................................................................1

2.0 System Operation.......................................................................................................................................2

3.0 Specifications.............................................................................................................................................3

4.0 Installation .................................................................................................................................................4

4.1 Mounting and Cable Penetrations...........................................................................................................4

4.2 Power and I/O Connections ....................................................................................................................4

5.0 Start-up ......................................................................................................................................................8

5.1 Power Switch Selections.........................................................................................................................8

5.2 Applying Power .....................................................................................................................................8

6.0 System Configuration ................................................................................................................................ 9

6.1 Password Protection................................................................................................................................9

6.2 Navigating the Menus.............................................................................................................................9

6.3 Main Display Functions........................................................................................................................10

6.4 User-Interface Menu Functions ............................................................................................................10

7.0 Options.....................................................................................................................................................14

8.1 Option for Battery Back-up Operation .................................................................................................14

8.0 Spare Parts ...............................................................................................................................................14

9.0 Warranty ..................................................................................................................................................14

Table of Figures

Figure 1 System Operational Diagram ............................................................................................................2

Figure 2 Dimensional View of Enclosure........................................................................................................4

Figure 3 Power Input Schematic......................................................................................................................5

Figure 4 Mother Board Layout ........................................................................................................................6

Figure 5 Control Board Layout........................................................................................................................7

Figure 6 Power Switch Configuration .............................................................................................................8

Figure 7 Password Protect SW1 ......................................................................................................................9

Figure 8 Front Panel User Interface............................................................................................................... 10

Figure 9 Menu Flow Chart ............................................................................................................................11

Model 840-RD Operator Manual Rev. 0 iii

Model 840-RD Operator Manual Rev. 0 iv

1.0 Description

The Model 840-RD is a read only remote display unit designed to operate with input from the Detcon
Model 840 Controller. The model 840-RD must be configured exactly as the Model 840 to function
correctly.

The system displays real time channel nformation on the backlit LCD. Display information includes
channel number, gas type, and gas concentration. It also shows the current Alarm/Fault status via the front
panel LED indicators.

The Model 840-RD has a built in power supply, giving the user a multitude of power options. It can be
powered by either 115/220VAC or 11.5-30VDC, and has an optional one-hour battery backup in the event
of temporary power loss. Is is housed in a Nema 4X waterproof enclosure.

Model 840-RD Operator Manual Rev. 0 Page 1 of 14

2.0 System Operation

The Model 840-RD receives the data for remote display from the host Model 840 Controller. The system
displays current status information on it’s LCD display, which includes the gas channel #,current reading,
gas type, and alarm LED status. The 840-RD must be configured to exactly match the host 840 controller
for proper operation.

Gas Detection/Alarm System

CH1 99 PPM CL2 CH5 99 PPM CL2
CH2 99 PPM CL2 CH6 99 PPM CL2
CH3 99 PPM CL2 CH7 99 PPM CL2
CH4 99 PPM CL2 CH8 99 PPM CL2

ALM 1 ALM 2 ALM 3 FAULT

RS- 485 Output

to Master

Device

MODEL 840-RD

PROG ↑ ↓ ENTER

Input Power

115/230 VAC

11.5-30 VDC

Figure 1 System Operational Diagram

Model 840-RD Operator Manual Rev. 0 Page 2 of 14

3.0 Specifications

Capacity

Sensor Inputs

Accuracy

Outputs

Electrical

Power Input

Power Consumption

8 Input Channels

Analog 4-20 mA or
RS-485 Modbus RTU

± 1% Full Scale Range

None

115-230 VAC

11.5-30 VDC

Normal: 5 Watts @ 24 VDC

Display

Electrical Classification

Dimensions

Physical

Operating Temperature Range

Warranty

1”x5” Backlit LCD

NEMA 4X

10”W x 12”H x 6”D

-40F to +167F

-40C to +75C

Two years

Model 840-RD Operator Manual Rev. 0 Page 3 of 14

4.0 Installation

4.1 Mounting and Cable Penetrations

Securely mount the Model 840-RD enclosure per the mounting dimensions provided in Figure 2.

Provide for suitable conduit/cable entries in the bottom of the enclosure. Keep AC power separate from
DC signals in conduit connections and runs.

Mounting Holes 5/16 Dia.

Figure 2 Dimensional View of Enclosure

4.2 Power and I/O Connections

Power and I/O connections are made on the Motherboard PCB, which is mounted on the back of the
enclosure. Plug-in male connector terminal blocks are provided for customer wire terminations. This
connector style provides for quick disconnect convenience during replacement or servicing. (Refer to
Figure 4)

4.2.1 AC Power

The 115 or 230 VAC input wiring to the terminals labeled J2 “AC IN” in Figure 3 & Figure 4.

Model 840-RD Operator Manual Rev. 0 Page 4 of 14

4.2.2 DC Power

For optional DC power input, connect 11.5-30 VDC to the terminals labeled J8 “DC IN” in Figure 3 &
Figure 4. This input can be used for primary power or back-up power in the event of a VAC power failure.

J2

External

VAC

Input

J8

External

VDC

Input

VIN

SW1

VAC ON/OFF

SW4

+

-

VDC ON/OFF

MOTHER BOARD POWER INPUT

F2

SW2

115VAC/220VAC

VSS

BATTERY
ON/OFF

PS1

TO

FROM

DC POWER
SUPPLY

VIN

SW3

VIN

PS2

BATT1

BATT2

SWOV

BATTERY
RESTORE

VSS

Figure 3 Power Input Schematic

4.2.3 Serial connection from the Model 840 Controller

The serial connection from the Model 840 Controller should be terminated at J10 the RS-485 input terminal
of the Model 840 Motherboard, see Figure 4. If applicable, the shield wire should be terminated at the RS­485 connector labeled JP1 “SHLD TO GND on the motherboard PCB.

Model 840-RD Operator Manual Rev. 0 Page 5 of 14

PS1

SW2

VOLTAGE
+
PS2

SW1

VAC

POWER
SWITCH

SW4

VDC

POWER
SWITCH

SELECT

Battery Restore

Switch

Jumper for RS-485

Shield to Earth

Grnd.

SW0V

SW3

BATTERY

EXTERNAL

AC IN

J2

EXTERNAL

DC IN

J8

JP1

Figure 4 Mother Board Layout

Model 840-RD Operator Manual Rev. 0 Page 6 of 14

Ribbon Cable to LCD

RS-485 Input for
Gas Sensor

1 2 3 4

ON

OFF

Ni-Cad
Battery

Ribbon Cable to
Mother Board

AUX AUX

Figure 5 Control Board Layout

Model 840-RD Operator Manual Rev. 0 Page 7 of 14

5.0 Start-up

NOTE: Before applying power, check and make sure that all the wiring connections and external devices
are installed correctly.

NOTE: Applying power with devices hooked up incorrectly may cause damage to the equipment.

5.1 Power Switch Selections

Refer to Figure 6. For AC power, locate the V-SELECT switch (SW2) and select the appropriate voltage
setting. If the unit will be powered by AC voltage only, then the VAC power switch SW1 should be turned
to the ON position, and insure the VDC power switch (SW4) is in the OFF position. If the unit will be
powered by the end-user’s DC source (or by a solar-battery power source), then the VDC power switch
should be turned to ON and insure the VAC power switch is in the OFF position. If the unit is to be
powered by AC and DC sources simultaneously, then both power switches should be in the ON position.
The switches are located on the Motherboard, shown in Figure 4

+
PS2

SW1

VAC
POWER
SWITCH

SW4

VDC
POWER
SWITCH

SW2

VOLTAGE

SELECT

SW0V

SW3

BATTERY

EXTERNAL

AC IN

J2

J8

JP1

EXTERNAL

DC IN

Figure 6 Power Switch Configuration

NOTE: The unit may have the internal battery back-up option. If so, there is a switch to leave the battery

connected or disconnected. The battery will normally be connected. See Section 8.1 for details on the
Battery Back-up Option.

5.2 Applying Power

Connect power per Section 4.2.

With the AC or DC power source connected, turn the applicable power switches to the ON positions.
Verify that the Main Display LCD comes up displaying gas readings on the display. Assuming there is no
target gas in the area of the gas sensor, the sensor should read 0 (zero) after a short warm-up period of 1-2
minutes.

NOTE: All alarm relays will be disengaged for the first 1-minute after power-up to provide for an
adequate sensor warm-up time.

Model 840-RD Operator Manual Rev. 0 Page 8 of 14

6.0 System Configuration

6.1 Password Protection

Password protection is accomplished via a switch selection on the backside of the Controller PCB. (Figure
7 SW1.) With SW1 position 4 in the ON position, the Controller will be in Password Protected mode. In
this mode there is no access to the Menus. The only functionality provided for is the Main Display and the
use of the Reset and Acknowledge functions. With SW1–4 in the OFF position, Password Protection is
turned off and there is complete access to the Menus.

part of Control Board

RS-485 Input for
Gas Sensor

Switch 1 pos 4 Password
Protect Switch

1 2 3 4

ON

OFF

Figure 7 Password Protect SW1

6.2 Navigating the Menus

The user-interface for configuring gas channels and alarms is very simple to use. The menu text is
displayed on the backlit LCD and is interfaced via the four function keys located below it. These keys are
labeled from left to right: PROG, UP, DOWN, ENTER. The ENTER key is a multiple-use key that also
controls the Reset and Acknowledge relay functions. With reference to the Menu Flow Chart (See Figure

9) and the correct function key sequencing, one can easily learn how to navigate the menus, make changes,
and access the logged data.

PROG Key:

From the Main Display, the PROG key enters into the Main Menu. Once inside the Main Menu, the
PROG key acts as an “Escape” key that moves backwards in the Menu flow chart.

“Up Arrow” Key:

This key moves the user up the Main Menu flow chart. It is also used to change highlighted entries
within menu selections in the upward direction.

“Down Arrow” Key:

This key moves the user down the Main Menu flow chart. It is also used to change highlighted entries
within menu selections in the downward direction.

ENTER and Reset/Ack Key:

This key has a multiple-use purpose. The ENTER function is used to accept selections within all Menu
screens.

Model 840-RD Operator Manual Rev. 0 Page 9 of 14

Figure 8 Front Panel User Interface

NOTE: The Remote Display automatically times out of Menu Mode and returns to the Main Display after

1 minute of inactivity. While in Menu Mode there are no updates to gas readings.

6.3 Main Display Functions

The Main Display is a 1¼”x 6” backlit LCD which has 4 lines by 40 characters. In normal operation “CH
# = XX ppm GAS” will be displayed. If any channel is in any gas alarm condition, the “CH#” will
change to “ALM”. If any gas channels are in Fault, they will display “CH # = IN FAULT”. If any
channels are in CAL MODE, they will display as “CH # = In Cal”. If any channels are not communicating
with sensors set up as serial input sensors, then they will display as “CH # = NO COMM”.

NOTE: The LCD has a backlight that will automatically turn off after 30 seconds of inactivity. The LCD
backlight will come on automatically as soon as any function key is pressed. This is a feature designed to
save on power.

6.4 User-Interface Menu Functions

The User-Interface is conducted via the Model 840-RD Front Plate shown above in Figure 8. The Menu
Flow Chart is shown below in Figure 9 and is navigated using the function keys described above. User­Interface menu activity is conducted via the 1”x5” LCD and the four function keys. There are also four
LED indicators on the front panel that show alarm and fault relay status. The LED’s represent ALM 1
(green), ALM 2 (amber), ALM 3 (red) and FAULT (blue). There are 13 Main Menu entries and their
functional descriptions are discussed below.

Model 840-RD Operator Manual Rev. 0 Page 10 of 14

N

K

Menu Flow Chart

ORMAL

OPERATION

MAIN MENU:
SET # OF CHANNELS

MAIN MENU:

SET CHANNEL RANGE

MAIN MENU:
SET CHANNEL

MAIN MENU:

SET CHANNEL ALARMS

MAIN MENU:
SET DATE & TIME

MAIN MENU:
VIEW TWA &

MAIN MENU:
VIEW ALARM RECS

TYPE

PEA

SET # OF CNHANNELS X

SET CHANNEL RANGE
CHX = #####

SET CHANNEL TYPE
CHX = XXXXXXX

SET CHANNEL ALARMS
CHX = ##### ASC/DEC

SET DATE AND TIME
MM/DD/YY HH:MM:SS

01/02/04 1200 - 1300
TWA #### PK #####

ALM: MM/DD/YY
CHX- A1 ON HH:MM:SS

CH1 … X

CH1 … X

CH1 … X

KEY:

Up Arrow

Down Arrow

Enter

PROG

Figure 9 Menu Flow Chart

6.4.1 Set # of Channels

This menu entry allows the selection of the number of active channels. NOTE: the number of activated
channels can be less than (but not greater than) the controller’s maximum input capacity. It should match
the number of sensors you are hooking up to the controller. The menu appears as:

Set # of Channels:
8

6.4.2 Set Channel Range

This menu entry allows the selection of the Channel Range for each gas channel input. This is a scrolling
list from 1.00 up to 10,000 and covers all of the Detcon gas sensor range possibilities. This menu appears
as:

Set Channel Range:
CH1 = XX.X

NOTE: If the range is changed, the alarm levels will have to be reset!

Model 840-RD Operator Manual Rev. 0 Page 11 of 14

6.4.3 Set Channel Type

This menu entry allows the selection of the Channel Type for each gas channel input. This is an alpha
numeric string that should encompass the units of measure followed by the chemical formula. For example
“ppm H2S” or “% LEL”. Use the up and down arrows to find the appropriate alpha numeric selection and
then use the ENTER button to select it. Enter your character string as you expect it to be displayed on the
Main Display.

Set Channel Type:
CH1 = (PPM_H2S___)

NOTE: The character entry for a “space” is required and is available in the alpha numeric choices. All
character positions must have an entry including “spaces” for unused characters at the end of the string.
This menu appears as:

6.4.4 Set Channel Alarms

This menu entry allows for the selection of the Channel Alarms for each gas channel input. These
represent your alarm level set-points. These set-points can be entered in 5% increments of the full-scale
range that has been selected for that channel. In this menu entry, you will also set whether the alarm
should be ascending (right arrow) or descending (left arrow) by toggling. This menu appears as:

Set Channel Alarms:
CH1 – ALM1 = X.X Æ

Each gas channel has the capability to set up to 3 alarms (ALM1, ALM2, and ALM3).

NOTE: If there is no intention of using a gas alarm relay, a setting of 0.00 (zero) will make it inactive.

NOTE: Any channels that are in alarm will display “ALM” instead of “CH#” on the Main Display.

NOTE: If the channel range is changed, then the alarm set points must be re-entered!

6.4.5 Set Date and Time

This menu entry allows for the correct entry of the current date and time. The menu appears as:

Set Date and Time:

01/26/04_14:56:07

6.4.6 View TWA and Peak Readings

This menu entry is used to view the recorded TWA and Peak readings for the different gas channels. This
data can be viewed on the screen or can be downloaded via the RS232 port to a PC for graphical
presentation. Refer to Section 7.2 on instruction for using the downloading software provided with this
controller.

05/05/04 09:00 0001
CH1 TWA XX PK XX

This data is recorded and formatted for display. It will report the date (05/05/04), time (09:00), record #
(0001), CH#, TWA and Peak reading as shown above.

Model 840-RD Operator Manual Rev. 0 Page 12 of 14

6.4.7 View Event Records

This menu entry is used to view the recorded and saved Alarm, Fault and Maintenance records for the
different gas channels. This data can be viewed on the screen or can be downloaded via the RS-232 port to
a PC for graphical presentation. Refer to Section 7.2 on instruction for using the downloading software
provided with this controller.

05/06/04 09:00
0000 CH1 ALM1 ON

The data is formatted for display. It will report the date, time, record #, CH#, Event type and Event status.
All events will be logged with their start and stop times in the order that they occur.

Model 840-RD Operator Manual Rev. 0 Page 13 of 14

7.0 Options

7.1 Option for Battery Back-up Operation

This option provides a nominal 1 hour of battery back-up power to the Gas Detection Alarm System. The
battery back-up system consists of two 12 VDC / 0.8 Amp-hour batteries in series, along with the requisite
low voltage cut-off circuitry. The batteries may be isolated during exchange or while in long-term storage
by using the battery disconnect switch shown in Figure 4. The low voltage cut-off circuit is designed to
disconnect the battery supply if the voltage is drained below 20 VDC. This is for battery protection
purposes. There is a battery restore switch on the Motherboard PCB, which must be pressed after the low
voltage cut-off is triggered. This is only necessary if the unit is going to be restored under battery power.
It is not necessary if restored under VAC power.

8.0 Spare Parts

500-U05077-001 Motherboard PCB
500-U05073-LCD Controller Board PCB W/ LCD Display
000-003606-000 Replaceable Power Supply with cables
340-121200-000 12 VDC Batteries (Optional)
360-BR2330 Date/Time Clock NICAD Battery

9.0 Warranty

Detcon, Inc., as the manufacturer, warrants under intended normal use each new Model 840-N4X controller
to be free from defects in material and workmanship for a period of one year from the date of shipment to
the original purchaser. Should the controller fail to perform in accordance with published specifications
within the warranty period, return to Detcon, Inc., for necessary repairs or replacement. All warranties and
service policies are FOB the Detcon facility located in The Woodlands, Texas.

Model 840-RD Operator Manual Rev. 0 Page 14 of 14