FAQs - Edinburgh Sensors

By: Edinburgh Sensors  05-Apr-2012

We understand that sometimes our customers have questions that they would like to have answered. Our Frequently Asked Questions (FAQs) page is here to help. Below you will find answers pertaining to the GasCard NG and Guardian + .

Q, How do I know if the sensor is powered and operating?

A, The easiest way to identify if the sensor is operating is to check to see if the IR source is flashing and if the blue power LED is on.

Q, Why do I have no power?

A, Has power been correctly fitted to the positive (+24) & negative (-0) terminals on J5. Ensure they are not connected to the output terminals (O/P+ & O/P-) on J5. Also check the power supply. (Can it supply sufficient power, See section 6.1 in the operating manual).

Q, Does the output gas concentration of the Gascard NG still have to be corrected for temperature and pressure effects.

A, Unlike the Gascard II the Gascard NG has built in pressure and temperature sensors and using these it will automatically correct the output for atmospheric changes. 

Q, What do the different LED’s on the main PCB represent.

A, The Gascard NG has self monitoring routines that check for faults within the system and reports these using LED’s on the main PCB and on the display if one is fitted. The main functions of the 6 LED’s on the Gascard NG main PCB are described in the table below.

LED No

Colour

Function

Description

Normal Condition

1

Orange

Lamp Fault (If ON or Flashing)

LAMP FAULT

OFF

2

Red

Detector Fault (If ON or Flashing)

DET. FAULT

OFF

3

Green

Transmitting Data (If Flashing)

TX

Flashing

4

White

Receiving Data (If Flashing)

RX

OFF

5

Yellow

Calibration Running (If ON)

CAL

Flashing

6

Blue

Power Indicator   (Powered if ON)

PWR

ON

Q, What do the different combinations of fault LED’s represent.

A, The table below lists the detectable errors and describes the way in which they are indicated to the user by the LED’s.

On the 4 digit LCD if one is fitted the errors are reported as “Err.”  alternating with      “F. XXX” where XXX is the fault number.

Error #

Description

LED Indication

1

Lamp fault

LED1 (Orange) & LED2 (Red) both on

2

Concentration <   -5%  Range

(Output under range) No LED indication

3

Concentration > 130%  Range

(Output over range) No LED indication

4

DSP temperature > 70C

LED2 (Red) flashing slowly (about 2s period)

5

DSP temperature < 0C

LED2 (Red) flashing slowly (about 2s period)

6

Head temperature > 70C

LED2 (Red) flashing fast (about 1s period)

7

Head temperature < 0C

LED2 (Red) flashing fast (about 1s period)

8

Reference signal Low (< 50%)

LED1 (Orange) & LED2 (Red) flashing alternately

9

Sample Signal Low (<10%)

LED1 (Orange) & LED2 (Red) flashing alternately

Q, How do I know if the sensor is powered and operating?

A, The easiest way to identify if the sensor is operating is to check the LCD display for readings.

Q, Why do I have no power?

A, Try checking/replacing the fuse (F1) and confirming what voltage it was set to run on (See sections 3.9 & 4.4 in the operating manual).

It’s possible that the fuse (F1) has blown as a result of applying 240V to the sensor when it was set to operate at 110V.

Q, Why is only the pump running and not the rest of the sensor?

A, Check/replace fuse (F2) (See section 4.4 in the operating manual).

Q, Why is the display reading “Err” & low flow lamp on.

A, The sensor is indicating that it is in the “Fault” condition “Low Flow”. This fault indication is normally caused by either the blocking of the inlet filters or tubing (restricting the flow of gas through the sensor) or the failure of the pump diaphragm (causing gas to be blown into the sensor rather than around the gas path).

Try checking/replacing the first inlet filter then the second (See section 4.1 in the operating manual) and then the condition of the pump (See section 4.5 of the operating manual).

If checking these does not correct the fault indication then a service should be arranged at Edinburgh Instruments.

Q, Why is the display reading “Err” & fault lamp on. 

A, The sensor is indicating that it is in the “Fault” condition “Err”. This indication of a fault can be caused by many factors (Failed IR source, signal failure, contaminated optics, electrical fault etc). When a fault indication of this type occurs the sensor will have to be returned to Edinburgh Instruments for a full service.


Other products and services from Edinburgh Sensors

05-Apr-2012

Services

Our friendly sales team will provide you with any information you need to make your choice of sensor, and guide you through our sensor range so that you can choose the most appropriate sensor for your application. The service report along with a quote for the necessary work will be returned to you, the customer, for approval before any further work is undertaken.


05-Apr-2012

Product Selector

None of the gas sensor and gas monitor products manufactured by Edinburgh Instruments are certified as being safe for use where ATEX or similar Standards apply. Other hydrocarbons ranges are available on request.