Greystone Energy Systems NDD Series Manuale utente
NDD Series - NO2 Transmitter Installation Manual
Feb 2, 2016 NDD-INS-002 Page 1
Introduction
The NO2 Transmitter uses an electrochemical sensor to monitor the NO2
level and outputs a 4-20 mA signal. It features a 3-wire analog output and
an alarm relay .
Before Installation
Read these instructions carefully before installing and commissioning the
NO2 transmitter. Failure to follow these instructions may result in product
damage. Do not use in an explosive or hazardous environment, with
combustible or flammable gases, as a safety or emergency stop device or
in any other application where failure of the product could result in
personal injury. Take electrostatic discharge precautions during
installation and do not exceed the device ratings.
Operation
In normal operation the sensor will measure the NO2 level in the surrounding air and output a proportional value on the 4-20
mA output. The NO2 measurement range is 0 to 10 ppm. The relay can be used to indicate an alarm condition. The trip point
for the relay can be programmed to three different settings with an on-board jumper. If the NO2 level exceeds the trip point
then the relay is activated. The relay will remain activated until the NO2 level drops below the (trip level – hysteresis) where
hysteresis is 3%.
Start-up
Verify that the NO2 Transmitter is properly wired according to the wiring diagrams and all connections are tight. Apply
power to the device and the sensor will begin reading the NO2 level and output the analog signal.
Mounting
The NO2 enclosure should be mounted on a flat surface three to five feet from the floor of the area to be controlled. Do not
mount the sensor near doors, opening windows, supply air diffusers or other known air disturbances. Avoid areas with
vibrations or rapid temperature changes.
NDD Series - NO2 Transmitter Installation Manual
Feb 2, 2016 NDD-INS-002 Page 2
Wiring
Use 22 AWG shielded wire for all connections and do not locate the device wires in the same conduit with wiring used to
supply inductive loads such as motors. Disconnect the power supply before making any connections to prevent electrical
shock or equipment damage. Make all connections in accordance with national and local codes.
The product is a 3-wire sourcing. Follow the example wiring diagrams to determine the correct wiring for the product. All
models have the same terminal functions.
Connect either an AC or DC power supply to POWER and COMMON and the 4-20 mA signal is available on the
OUTPUT terminal with respect to COMMON. The current output operates in the Active mode and does not require a loop
power supply. This means the signal current is generated by the transmitter and must not be connected to a powered
input or device damage will result. This is the typical operating mode of a “three-wire device”. Check the controller Analog
Input to determine the proper connection before applying power.
Ensure the controller Analog Input (AI) matches the transmitter output signal type before power is applied. The current signal
has a maximum load that it will drive. Follow the ratings in the Specification section or inaccurate readings may result.
The relay output is available on the NO, NC and R.COM terminals. The relay R.COM terminal is NOT connected to the
signal or power supply COMMON terminal. The relay output is completely isolated and has both Normally Open (NO) and
Normally Closed (NC) signals. These signals can be used to directly control alarms, ventilation fans or may be connected to
digital inputs of the B.A.S. for status monitoring.
NDD Series - NO2 Transmitter Installation Manual
Feb 2, 2016 NDD-INS-002 Page 3
Calibration
The transmitter features a simple snap-mount sensor pcb that is pre-calibrated. This means that the entire sensor pcb can
simply be replaced with a new calibrated pcb if desired without having to remove the enclosure. This sensor swap requires no
tools and can be completed in seconds. Simply disconnect the device wiring, remove the old sensor pcb, snap in the new pcb
and reconnect the device power. There is no need to make any adjustments or apply gas to the transmitter using the sensor
swap method.
The device may also be calibrated or verified with NO2 gas if required. This requires a field calibration kit consisting of Zero
and Span of gases, Calibration adapter, Tubing with a calibration cap to cover to the sensor, a miniature screwdriver and a
digital multi-meter.
Verification can be done without removing the device cover. Simply apply Span gas using the calibration cap attached
directly to the port on the cover and monitor the output signal.
The device cover must be removed to perform an actual calibration. In this case, the gas calibration cap attaches to the sensor
fixture inside the enclosure. The sensor must be continuously powered for at least 1/2 hour prior to calibration. Calibrate the
sensor either in clean air or by applying Zero gas with a flow rate of 0.5 to 1 liters per minute. Wait 2 minutes and adjust the
ZERO pot on the sensor board until a 4 mA output is obtained.
Then attach the Span gas supply. Attach the cap to the fixture over the sensor. Slowly turn the valve knob on the regulator to
let the gas begin flowing. Calibrate the sensor either by applying Span gas with a flow rate of 0.5 to 1 liters per minute. Wait
2 minutes and adjust the Span pot on the sensor board until a 20 mA output is obtained. The Span gas need not be the full
scale concentration, but could be a fraction of this. A half scaled concentration, accordingly, should provide a 12 mA signal.
If the gas cap is too loose on the fixtures, simply place a wrap of electrical tape around the cap to tighten it up.
Verify With Cover In Place Calibrate With Cover Removed
NDD Series - NO2 Transmitter Installation Manual
Feb 2, 2016 NDD-INS-002 Page 4
Common Specifications
Measurement . . . . . . . . . . . . . . . . . Electrochemical
Sample Method . . . . . . . . . . . . . . . Diffusion
Measurement Range . . . . . . . . . . . 0-10 ppm
Accuracy . . . . . . . . . . . . . . . . . . . . 0.2 ppm or 5% of reading (whichever is greater)
Sensor Life Expectancy . . . . . . . . . > 2 years
Operating Temperature . . . . . . . . . -20-50 C (-4 -122 F),
Operating Humidity . . . . . . . . . . . . 15-90 %RH (0-99% intermittent)
Pressure . . . . . . . . . . . . . . . . . . . . . Atmospheric 10%
Typical Area Coverage . . . . . . . . . 700 m2(7500 ft2) or 15 m (50 ft) radius
Calibration Adjustments . . . . . . . . Zero and Span pots
Wiring Connections . . . . . . . . . . . Screw terminal block (14 to 22 AWG)
Enclosure . . . . . . . . . . . . . . . . . . . 2.8”w x 4.1”h x 1.9”d (71 x 104 x 48 mm)
Power Supply . . . . . . . . . . . . . . . . 24 Vdc ± 20% or 24 Vac ± 10% (non-isolated half-wave rectified)
Consumption . . . . . . . . . . . . . . . . . 50 mA max
Output Signal . . . . . . . . . . . . . . . . 4-20 mA sourcing
Output Drive Capability . . . . . . . . 550 ohms max @ 24 Vac/dc
Relay Contacts . . . . . . . . . . . . . . . SPDT, Form C contacts (N.O. and N.C.), 5 Amps @ 30 Vdc
Relay Trip Point . . . . . . . . . . . . . . Low = 1 ppm, Mid = 3 ppm or High = 5 ppm, jumper selectable
Relay Hysteresis . . . . . . . . . . . . . . 3%
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