Rattler T40 Operating Instructions

Alarm Conditions / Operational Modes

The T40 Rattler is equipped with audible, visual, and 

vibrating alarms to alert you when the ambient gas 

concentration exceeds one of the two alarm levels (low 

and high).  For CO, the T40 Rattler is preset to alarm at 

35 and 70 ppm.  For H

2

S, the preset alarm levels are 

10 and 20 ppm.  To change these low and high settings, 

see ‘Setting the Configuration’ below.       

At any time during operation, you can access the peak 

reading and alarm set point screens by pressing 

‘Mode.’  The peak reading screen displays the highest 

concentration of gas detected since the peaks were last reset.  To reset 

the peak reading, press ‘On/Off.’  The peak screen will reset to current 

reading at the time of reset.

Pressing ‘Mode’ once more will show you the low alarm set point.  

Pressing ‘Mode’ again will show you the high alarm set point.  Pressing 

‘Mode’ again will return you to the gas readings mode.

Changing the Batteries

The T40 Rattler operates for up to 500 hours on a single 

“AA” alkaline battery (additional replacement battery 

included).  The icon on the display continuously shows 

battery life.  The T40 Rattler will alert you of a low 

battery condition by emitting a beep once every 30 

seconds. To change the battery, simply insert the 

supplied hex tool into the battery cap, rotate 1/8 turn 

counterclockwise, and remove battery (E).  Install 

new battery, being sure to observe proper polarity.  

Replace the battery cap and turn clockwise with hex 

tool.  Use only Varta 4006, Kodak LR6, Rayovac 

815, Eveready EN91 or LR6, Duracell MN1500 or 

PC1500, Panasonic AM-3, Sears Diehard NEDA 15A, or 

Gold Peak 15A Batteries.  Warning: Replace battery only in 

non-hazardous location.  Substitution of components may 

impair intrinsic safety.

Warranty

The T40 Rattler carries a two-year warranty from the date of 

shipment.  See included warranty certificate for coverage 

details.

Setting the Configuration

Press and release the ‘On/Off’ and ‘Mode’ keys simultaneously during 

the warm up routine when the countdown reaches between 15 and 10 

seconds.  Four options will be available to configure: High alarm value, 

Low alarm value, Calibration gas concentration and Display.  Press the 

‘On/Off’ key to change the displayed value.  Use the ‘Mode’ key to adjust 

the value.  Once the desired value is met, press the ‘On/Off’ key to accept 

the value.  If no buttons are pressed, the T40 will scroll to the next item.  

When the display configuration is turned off, the T40 will display Safe, 

Low, and High conditions instead of actual PPM levels.

After going through all configurations, the T40 will return to the warm up 

routine.  All changes are saved to memory when the unit is turned off.

Approvals

UL and cUL – Class I, Groups A, B, C, D

CSA – Ex ia IIC T4

Australia – AUS Ex ia IIC T4

CE-Mark (ATEX) –           II 2G, DEMKO 02 ATEX 021349X EEx ia IIC T4

OPERATING INSTRUCTIONS

The T40 Rattler is a single gas monitor designed to alert the user to rising concentrations 

of either Carbon Monoxide (CO) or Hydrogen Sulfide (H

2

S).  The T40 Rattler will 

continuously display the ambient concentration of the designated gas and activate its 

audible, visual and vibrating alarms whenever the preset limits are exceeded.

1-800-DETECTS

412-788-4353

www.indsci.com

1-800-788-8383

412-788-8353

1001 Oakdale Road

Oakdale PA 15071-1500

P/N 17106295  REV0305

TM

HI

LO

0000

PEAK

CO

PPM

HI

LO

DURA

CELL

DU

RA

CE

LL

+

-

E

Turning the T40 Rattler ON/OFF

To turn the unit on, press and hold the ‘On/Off’ 

button until the word “On” appears on the 

display.

The T40 Rattler will power up and begin a 

warm up routine which includes tests of the display, 

audible, visual, and vibrating alarms.  Following this 

brief warm up, the T40 Rattler enters the gas 

readings mode signified by the four digit display and 

gas identifier icon.  To turn off the T40 Rattler, simply 

press and hold ‘On/Off’  for five seconds (four 

beeps).

Zeroing / Calibrating the T40 Rattler

Industrial Scientific recommends that a periodic 

function test be performed on the T40 Rattler 

using a known concentration of calibration gas.  

A full calibration should be performed in the 

event that the unit fails to respond properly to the 

function test, or if the monitor is dropped, 

submerged or appears damaged.

To begin the calibration, flip the calibration 

adapter to the opposite side of the monitor as 

shown (B).  The T40 Rattler will beep signaling 

the instrument is now ready to zero.

To zero the T40 Rattler, press 

‘On/Off’ and ‘Mode’ simultaneously 

(C).  The T40 Rattler will automati-

cally zero and beep after approxi-

mately 10 seconds, signaling that the 

zeroing process is complete.  If you do not wish 

to perform a span calibration, flip the calibration 

adapter back to its original position and the T40 

Rattler will return to the gas reading mode.

Note: Never zero the T40 Rattler in an environ-

ment that is known to contain a background of 

CO or H

2

S.  For these environments, use zero air 

gas.

After the zeroing process is complete, the T40 

Rattler will beep, signaling it is ready to be 

span calibrated.  To perform a span calibration, 

connect the supplied tubing between the 

regulator and calibration adapter as shown (D), 

turn the regulator’s flow control to “open,” and 

press ‘On/Off’  and ‘Mode’ simultaneously.  

The T40 Rattler will begin to show its response 

to the applied gas as a full span on the display.  

After approximately 1.5 minutes, the T40 

Rattler will finish the calibration routine and 

display the status of the sensor.  Remove 

tubing and flip calibration adapter back to its 

original position.

The three status conditions are: GOOD –  the sensor is healthy and should operate 

for an extended period of time; PASS – the sensor passed calibration but had a 

marginal response; or FAIL – the sensor did not pass calibration, meaning the 

sensor has reached the end of its useful life, or the calibration gas source was not 

accurate or has run out.  Note: The T40 Rattler is factory programmed to accept 100 

ppm (CO) and 25 ppm (H

2

S) span gas inputs.  Gases in other concentrations will 

result in inaccurate or failed calibrations.

A

0000

PEAK

CO

PPM

D

0000

ZERO

CO

PPM

C

0000

CO

PPM

0000

CO

PPM

B

On/Off

Mode

On/Off

CAL