Rothenberger RO 77 User manual

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RO 77
rothenberger.com
MAN00149
RO 77
EN Instructions for use

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Contents Page
1 Introduction ......................................................... 3
2 Operating instructions ........................................ 4
2.1 On/Off ............................................................................. 4
2.2 Turn on countdown....................................................... 4
2.3 Normal display............................................................... 5
2.4 Backlit display................................................................ 5
2.5 Max ................................................................................ 5
2.6 Hold................................................................................ 5
3 Checking for CO................................................... 6
3.1 Visual indicator .............................................................. 6
3.2 Audiable & vibrating alarm........................................... 7
4 Battery information............................................. 8
4.1 Replacing the battery .................................................... 8
5 Troubleshooting .................................................. 9
6 Specifications......................................................10
7 Cleaning ..............................................................10
8 Cold weather precautions..................................11
9 Electromagnetic compatibility ...........................11

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The RO 77 is used to monitor carbon monoxide (CO) levels in commercial
and residential living spaces, warehouse operations, combustion engine
repair facilities, public facilities and any other indoor areas where people
may work or live. The full-featured, compact design of the RO 77 allows for
easy use in almost any normal working environment. It is not designed for
use in areas designated as “confined spaces” where other toxic gases may
be present or in designated zoned areas where Intrinsic Safety products are
mandatory.
Features include:
• One button ON with Auto Zero
• Measures from 0 to 999 ppm CO
• Long life CO sensor with 5 year expected life
• Captures maximum value
• Preset Alarms
• Vibrating Alarm
• Visual three colour LED
• Audible tone
• Data Hold
• Back lit display
• Battery Indication
Warning
Carbon monoxide is life threatening even at relatively low concentrations.
Be sure you understand the risks before investigating potential leaks.
This monitor measures combustion gases that may be toxic in relatively low
concentrations. This monitor must only be used by trained and competent
persons after due consideration of all the potential hazards.
Users of portable gas monitors are recommended to conduct a “bump”
check before relying on the unit to verify an atmosphere is free from hazard.
A “bump” test is a means of verifying that a monitor is working within
acceptable limits by briefly exposing to a known gas mixture formulated to
change the output of the sensor. (This is different from a calibration where
the monitor is exposed to a known gas mixture but is allowed to settle to
a steady figure and the reading adjusted to the stated gas concentration of
the test gas).
1 Introduction

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A bump test can be conducted using the disposable canister of CO primarily
used for checking domestic CO alarms.
Once the monitor is switched on every accepted button press is accompa-
nied by an audible beep.
On/Off
The RO 77 is operated by a single button for ON and OFF. It is designed for
use in ambient air, ranging in temperature from 0 to 40°C (32 to 104°F).
When the unit is switched ON by pressing and holding the ON button (Only
switch ON outdoors or where no CO is present), it automatically zeros in
50 seconds. During countdown the display shows time remaining as two
digits.
Be sure to switch on in fresh air well away from boiler flues, vehicle
exhausts, smokers and any other potential sources of CO.
The countdown starts at 50. When the countdown reaches 00 the meter
will set its sensor to zero and display CO concentration using three digits.
A battery level indicator will appear in the top left hand of the screen and
“ppm” will appear in the bottom right hand of the screen.
2 Operating instructions
2.1 On/Off
2.2 Turn on countdown

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Hold down for two seconds to switch meter OFF.
Quickly press to toggle the backlight on or off.
Note: using the backlight reduces the battery life.
Press to display the highest reading detected while the meter is
switched ON.
Press again to display current value
Holds value when button is pressed.
Freezes the display with the CO reading at the time the HOLD button is
pressed. Press again to display current value.
2.3 Normal display
2.4 Backlit display
2.5 Max
2.6 Hold
CO ppm

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3 Checking for CO
Note: Ensure that the sensor grill at the front of the monitor is free
from obstruction.
The RO 77 can be used to check for spillage around fires or cookers but
does not replicate the functions of Appliance Sampling Probes as used in
the Room CO Test procedure that forms part of CPA1.
The RO 77 should not be exposed to high temperatures (anything above
40oC) or be used directly in streams exhausting from flues.
Warning
If CO levels in a room or space exceed 30ppm it is strongly recommended
that any appliances are switched off and that the space is evacuated and
ventilated before anybody returns to the area.
Where CO spillage (or migration) has been detected the procedures defined
for Room CO Testing as part of CPA1 should be adopted. If you are in any
doubt about what to do seek expert advice. Where CO spillage (or migra-
tion) has been detected the procedures defined for Room CO Testing as part
of CPA1 should be adopted. If you are in any doubt about what to do seek
expert advice.
The LED on the top of the RO 77 lights and changes colour when CO levels
increase or decrease.
OFF: 0-1 ppm
GREEN: 2-9 ppm
AMBER: 10-29 ppm
RED: 30 ppm or higher
These values are based on environmental and health standards as listed in
the table below.
3.1 Visual indicator

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*The effects can vary depending on size, age, sex and health. Kane is not
liable for the accuracy of this information.
An audible alarm will sound if 30 ppm CO (or greater) is detected. The
alarm frequency will increase with higher concentrations. The vibrator will
also vibrate. Check the LCD display for actual level. While the alarm is
sounding the unit can not be turned off but will switch off if the battery is
‘empty’.
The alarm functions will still operate when and are selected
although the reading on the display will not be the current reading but the
“Held” or “Max” values.
Concentration
of CO in Air
Inhalation Times and
Toxic Symptoms*
10 ppm
The maximum allowable concentration for an 8 hour
period without any known health risks according to the
Department of Health and BS7967.
30 ppm
The maximum allowable concentration for competent
persons to work in when investigating reports of fumes
according to BS7967.
200 ppm Mild headache, fatigue, dizziness and nausea after 2 to
3 hours.
400 ppm Frontal headache and nausea within 1 to 2 hours. Life
threatening after 3 hours.
800 ppm
Severe headache, dizziness and convulsions within
45 minutes. Unconsciousness within 2 hours. Death
within 2 to 3 hours.
1,600 ppm Headache, dizziness and nausea within 20 minutes.
Death within 1 hour.
3,200 ppm Headache, dizziness and nausea within 5 to 10 minutes.
Death within 30 minutes.
6,200 ppm Headache, dizziness and nausea within 1 to 3 minutes.
Death within 10 to 15 minutes.
12,800 ppm Death within 1 to 3 minutes.
3.2 Audiable & vibrating alarm

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4 Battery information
Do not use the monitor when the battery symbol is showing low/empty.
Replace the battery immediately.
If the battery level falls to a level where the accuracy of the readings might
be compromised the monitor will eventually give both audible and visual
warnings before switching off.
Warning
Do not ignore the warnings as your monitor will no longer be functioning
and your safety may be compromised.
The battery compartment is located underneath the belt clip. To access the
battery compartment the belt clip must be lifted at its pivot end and be
rotated. The pivot is keyed to prevent rotation in normal use and is spring
loaded.
Full battery indication
Lower battery indication
Low battery
alarm indication
4.1 Replacing the battery

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5 Troubleshooting
If the display fails to stabilise at around zero within a few minutes this may
indicate an expired sensor or a sensor that has been exposed to excessive
levels of CO. If the symptom persists seek advice from Kane.
Always check for correct operation before each use. Use a known source of
CO taking care to act in a safe manner and not to expose the RO 77 sensor
to extreme temperatures or CO concentration. If the unit does not change
as expected, return the unit to Kane.
If during use, you detect CO leaks, be sure you know the appropriate ac-
tions to take to protect yourself and others. Before switching off the mon-
itor always expose it to fresh air until the reading falls below 5 ppm. Note
that the readings fall much more slowly than they rise so you may need to
wait some minutes.
Lift the clip at the pivot end against the spring by a few millimetres and then
rotate the clip clear of the battery compartment.
Remove the battery compartment cover and replace the battery. Alkaline
Duracells are recommended.
Always recycle the spent battery through an approved battery recycling
scheme.
Having fitted a fresh battery, replace the cover and rotate the belt clip back
to its normal position.
Always check your monitor for correct operation after replacing its battery.

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6 Specifications
7 Cleaning
¹ As per EN 50543 : 2011
² Based on ‘normal’ use without backlight or alarms
No user serviceable parts.
Re-calibrate every 12 months.
Check for correct operation as described in this manual before every use.
This product can be cleaned using a damp lint free cloth and a small
amount of non-abrasive detergent. Take care to avoid moisture entering
the sensor’s grill and after cleaning leave the product in a warm dry place
to allow any surface dampness to evaporate. Under no circumstance should
any solvent cleaner be used as this may cause damage to the plastic case,
display and sensor.
Range 0-999 ppm
Resolution 1 ppm
Accuracy ±3 ppm 0 to 100 ppm¹
±5% reading > 101 ppm±
Audible alarm Preset at 30 ppm
Visual alarm LCD and LED
Battery 9V alkaline
Battery life² Up to 250 hours using Duracall Procell
Ambient temperature 0-40°C (32-104°F)
Warranty 1 year