Toxalert GVU-VOC User Manual

TM

DATA

TOXALERT

SHEET

DIESEL EXHAUST SMOKE/VOC SENSOR MODEL GVU-VOC

TYPICAL INSTALLATIONS:

• Bus Garages • Vehicle Maintenance & Storage

• Fire Stations Highway Departments

• Tunnels Utilities

• Truck Warehouses Public Works

• Welding Shops

GENERAL DESCRIPTION:

The model GVU-VOC diesel smoke full spectrum sensor is designed
to interface with Toxalert International’s GVU series control units.
The GVU-VOC is a microprocessor-based air quality sensor utilizing
metal-oxide semi conductor technology. This is a full spectrum sensor
sensitive to a wide variety of air pollutants such as smoke,
hydrocarbons, gasoline fumes, acetone, toluene, etc. (see Table 3).
The GVU-VOC indicates its status with indicators for auto-power
on and processor normal, ok, low, mid or high for level of
contaminant detected.

BACKGROUND:

The diesel engine exhausts a great percentage of smoke (soot) as
well as, many hydrocarbons (e.g., ethylene, formaldehyde, methane,
benzene, and polynuclear aromatic hydrocarbons) and toxic gases
(e.g., nitric oxide, nitrogen dioxide and oxides of sulfur). The smoke
is particularly evident at the beginning of a work shift, when all
the buses or tracks are started in a maintenance/storage facility.
Even though, the exhaust smoke is not classified as a toxic, it is considered a carcinogen (reference:
carcinogenic effects of exposure to diesel exhaust - NIOSH Publication No. 88-116). Therefore many facility
owners are monitoring the smoke/hydrocarbons (VOC) as well as, the toxic oxides of nitrogen.

Model GVU-VOC

FEATURES:

• Micro processor based

• Power Indication

• Low, mid, high reading indicators

TOXALERT INTERNATIONAL, INC., P.O. BOX 159, MOUND, MINNESOTA 55364 [phone] FAX [phone]

Visit our website at www. toxalert. com

• Humidity and Temperature compensated

• Completely solid state for long life

• Low voltage class two (2) wiring

SPECIFICATIONS

•

Type: Metal semi conductor

• Input voltage: 20- 30VAC from GVU controller

• Operating Temperature: 32º to 104ºF (0-40ºC)

•

Display: 5 indicaators ok, low, mid, high

• Sample Method: Diffusion

• Supply Current: 220 MA(max)

• Operating Humidity: 0-85% non-condensing

• Enclosure: AE wall mount

2.75”W x 4.65”H x 1.25”D
(70 x 118 x 32mm)

INSTALLATION INSTRUCTIONS

1. INSTALLATION

For best operation, locate a mounting location away from
direct fresh air intakes, doors and supply diffusers and
mount vertically on wall or support column approximately 5
to 6 feet above floor. An alternate location is in the ceiling
space of facilities with top discharge diesel vehicles. Refer to
figures 1 and 2; Table 1 and 2 and installation instructions in
GVU series control unit data sheet and install the GVU­VOC sensor as follows.

2. COVER REMOVAL

Screw set-screw in bottom of cover in (clockwise) and
remove cover.

3. MOUNTING

The sensor has mounting provisions to install directly on a
standard electrical box.

4. SENSOR WIRING
WARNING: To prevent fire or shock hazard, turn

off power source to control unit before making
connections. Comply with all local building codes and
ordinances.

NOTE: Refer to Figure 2 and Tables 1 and 2. Use shield
cable to interconnect sensor and control unit if metal con­duit is not used, or if conduit also contains AC wiring.

1.) Measure distance between sensing unit
and control unit and select proper wire or larger wire
from Table 1.

Figure 1:

Figure 2:

TOXALERT INTERNATIONAL, INC., P.O. BOX 159, MOUND, MINNESOTA 55364 [phone] FAX [phone]

Visit our website at www. toxalert. com