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Model GIR911

Infrared Carbon Dioxide

NOVA-Sensor

D

ESIGN

 M

ANUAL

T h e   i n f o r m a t i o n   a n d   t e c h n i c a l   d a t a
d i s c l o s e d   b y   t h i s   d o c u m e n t   m a y   b e
u s e d   a n d   d i s s e m i n a t e d   o n l y   f o r   t h e
p u r p o s e s   a n d   t o   t h e   e x t e n t
s p e c i f i c a l l y   a u t h o r i z e d   b y   S

A F E T Y

S

Y S T E M S

  T

E C H N O L O G Y

  i n   w r i t i n g .   S u c h

i n f o r m a t i o n   a n d   t e c h n i c a l   d a t a   a r e
p r o p r i e t a r y   t o   S

A F E T Y

 

S

Y S T E M S

T

E C H N O L O G Y

  a n d   m a y   n o t   b e   u s e d   o r

d i s s e m i n a t e d   e x c e p t   a s   p r o v i d e d   i n   t h e
f o r e g o i n g   s e n t e n c e .

7 0 0 7 1

S

A F E T Y

  S

Y S T E M S

  T

E C H N O L O G Y

2 3 2 8 2   M i l l   C r e e k   D r i v e ,   S u i t e   2 1 5
L a g u n a   H i l l s ,   C a l i f o r n i a   9 2 6 5 3 ,       U S A
T e l   ( 9 4 9 ) 5 8 3 - 1 8 5 7       F a x   ( 9 0 9 ) 3 4 0 - 6 6 4 3
w w w . s a f e t y s y s . c o m

The information in this document is applicable to

sensors built on or after October, 2001

Summary of Contents for GIR911

Page 1: ...n f o r m a t i o n a n d t e c h n i c a l d a t a a r e p r o p r i e t a r y t o S A F E T Y S Y S T E M S T E C H N O L O G Y a n d m a y n o t b e u s e d o r d i s s e m i n a t e d e x c e p t...

Page 2: ...DIP Switch settings 911 7 OPERATION 911 8 Power Up 911 8 Changing the Setpoints 911 8 Calibration 911 9 Balancing 911 11 Recalibration Schedule 911 11 NOVA SENSOR OUTPUTS 911 11 0 to 20 mA Current Loo...

Page 3: ...y test gas when the 000 stops flashing CAL will be flashed as the gas is sampled When finished approx 40 seconds the display will stop flashing remove the gas now The sensor begins normal operation on...

Page 4: ...es the ratio of the averaged active and reference signals With a constant length of the optical axis the relation between the A R ratio and the actual gas concentration is logarithmic The length of th...

Page 5: ...l blocks for field wiring and transparent lid used to observe the operational status of the numerical readout and LED s The field wiring is connected to the terminal blocks inside the enclosure The te...

Page 6: ...e figure below It is preferable to attach the sensor to a wall or bracket using bolts through the two mounting holes However these mountings may be omitted if the electrical conduit is sufficiently ri...

Page 7: ...n for DC power and the 4 20 mA signal MODE Pushbutton and Remote RESET The external MODE pushbutton on the NOVA Sensor housing can be used to clear any relays or alarms in the NOVA Sensor which have b...

Page 8: ...pins To change the LOW ALARM contact from nor mally open to normally closed move the jumper on the pins marked LO ALM from the NO to the NC pins To change the FAULT contact from normally closed to nor...

Page 9: ...that it will not be grounded Avoid running the cable close to high powered cables or equipment or close to radio transmitters or antennas Cable Color Codes The GIR910 infrared gas sensor head is suppl...

Page 10: ...ring which various internal components and parameters are checked During the BIT the indicator lights will be flashing Upon successful completion of the BIT the NOVA Sensor begins a 30 second countdow...

Page 11: ...dule with a reference point for 0 CO2 gas concentration In locations where clean air cannot be assured you may need to purge the sensor with clean air from a gas bottle before starting the calibration...

Page 12: ...e CAL LED is switched off The microcontroller in the NOVA Sensor automatically stores the calibration in its internal non volatile memory for use in subsequent measurements During the calibration proc...

Page 13: ...ect linear read out of gas concentration Output is 4 mA when no gas being detected Output is 20 mA when the full scale gas concentration of gas 2 0 or 5 0 CO2 is being detected The 0 to 20 mAcircuitry...

Page 14: ...he 0 to 20 mA loop and each of the three relays is held for about 2 seconds and repeated 3 times The test lasts for approximately 1 minute At the completion of the test the built in test BIT is execut...

Page 15: ...to initiate entry to Protection Mode If the NOVA Sensor is already powered up and in Protection Mode press the Sensor Reset Button and hold it in active for 20 to 30 seconds then release it This cause...

Page 16: ...ctive and inactive HIGH alarm Inactive HIGH Alarm Test The following outputs are simultaneously toggled three 3 times and are held in each state for approximately 2 seconds 0 to 20 mALoop Alternates b...

Page 17: ...ing causes 1 Bad contact between electronics module and terminal blocks in enclosure This effect is noticeable when pressing on the installed electronics module from the top or when twisting it 2 Loos...

Page 18: ...providing a conduct ing current path between the CHASSIS and the 0V RETURN terminals The rewiring procedure will insulate the enclosure from the CHASSIS terminal and connect the CHASSIS terminal to t...

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