SMART FARM · ENVIRONMENTAL SENSORS

The six readings that decide how a poultry house performs — on one cable

A house you can measure is a house you can control. ENM puts the six sensors a poultry farm actually needs on a single RS485 line — daisy-chained up to 2,000 m into one controller or dashboard, with alerts to LINE. Buy them one at a time, or let us design the whole system.

What we measure, and why

These six were not chosen because they are easy to measure. Each one is tied directly to cost or to flock performance. The figures under “when to act” are general poultry-industry guidance — use them as a starting point and adjust for breed, flock age and your integrator’s own manual.

What we measure	Why it matters	When to act	ENM device
1Ammonia NH₃	Attacks the respiratory lining. Birds eat less, grow slower, FCR worsens, and you see more eye irritation and footpad lesions. A human nose adapts to it within minutes — which is exactly why it has to be measured rather than judged.	Hold below 25 ppm continuously, and below 10 ppm for chicks. Damage begins around 10–20 ppm.	HX-NH3-N01
2CO₂ + temperature + humidity	CO₂ tells you whether minimum ventilation is genuinely enough — above all during brooding, when the house is shut down to hold heat. Temperature paired with humidity is what the bird actually feels, which is not the number on the thermometer.	CO₂ below 3,000 ppm (outside air is about 400 ppm) · relative humidity 50–70 %RH	HX-CO2WS-N01-2
3Air velocity at bird level	In a tunnel house the air is the air conditioning. Uneven velocity creates dead spots, birds crowd, and weights come out uneven down the length of the house. Velocity calculated from cross-sectional area is almost always higher than what is measured at bird level.	2 m/s is the working standard for grown birds, 3 m/s the maximum for cooling (at 3 m/s the effective temperature is roughly 10–12 °C below actual) · never for chicks	W410G1
4Static pressure	Tells you whether air is entering through the inlets you designed or leaking in somewhere else. When pressure drops, the jet no longer reaches the centre of the house and falls straight onto the chicks. It is the number you set your inlets by.	Minimum ventilation typically runs around 12–25 Pa (0.05–0.10 in w.c.), depending on house width and weather	ENM TS-4000
5Water flow	Water intake is the earliest health signal a flock gives you — earlier than visible symptoms, earlier than feed. An unexplained drop in a single day is a reason to walk the house now. It also catches leaking lines and stuck nipples.	Watch the daily trend rather than any single number · water-to-feed ratio typically 1.6–2.0 : 1 at normal temperatures	ZJLCD-485
6Electricity	Power is the largest fixed cost after feed, and almost all of it is fans and lighting. Metering each house separately shows you which cycle drew abnormally, which motor is creeping up in current before it fails, and what electricity actually costs you per kilo of bird.	Compare kWh per cycle and kWh per kg of bird between houses and between flocks · a steady rise in current on the same motor is a warning before it fails	ADW300

Where they go in the house

Placement matters as much as the sensor. An ammonia probe hung too high gives a number that looks fine but has nothing to do with the air the birds are breathing; the same is true of an air-velocity probe set too close to the wall. This is the layout we use when we specify a site.

If the farm already runs a controller or SCADA system, every one of these connects straight into it as long as it speaks Modbus RTU. Nothing existing has to be replaced.

The devices

Every one is available on its own. Full specifications and manuals for each are available on request over LINE.

Ammonia NH₃ transmitter

ENM HX-NH3-N01 · wall mount, waterproof · extended-probe version M30×1.5

Ranges 0–50 / 0–100 / 0–500 / 0–1000 ppm
Accuracy ±8% FS (high-resolution version ±5% FS at 100 ppm)
Rated −40 to +80 °C, 0–100 %RH — survives house conditions
Optional OLED display for reading on the spot

Output: RS485 Modbus RTU · Supply: 10–30 VDC · Sensor life: ≥ 12 months

CO₂ + temperature + humidity, 3 in 1

ENM HX-CO2WS-N01-2 · SKU CO-HX-0001 · NDIR infrared sensor

CO₂ 0–5000 ppm (0–2000 and 0–10000 ppm also available)
Accuracy ±(50 ppm + 3% FS) with built-in temperature compensation
Temperature ±0.5 °C · humidity 0–100 %RH
Infrared measurement, so it does not drift the way electrochemical cells do

Output: RS485 Modbus RTU up to 2,000 m · Supply: 10–30 VDC · Power: 0.3 W

Duct air-velocity transmitter

ENM W410G1 · SKU WS-HX-0001 · thermal (hot-film) · probe Ø14 × 220 mm

Six selectable ranges from 0–1 up to 0–30 m/s
Resolution 0.01 m/s, accuracy 3%, no zero drift
On-board LED display — readable without a control system
Corrosion-resistant housing, IP65

Output: 0–5V / 0–10V / 4–20mA / RS485 · Supply: 24 or 12 VDC/AC

Digital differential pressure gauge

ENM TS-4000 · round panel gauge Ø114.5 mm · an ENM group product

Ranges from 0–60 Pa up to 0–10000 Pa, plus bidirectional ±30 to ±5000 Pa
Display units selectable: Pa / kPa / mbar / mmWC / inWC
High and low alarm setpoints (AL/AH) set at the gauge
Averaging 1–255 s, so gusts do not make the reading jump

Output: RS485 (address 1–255) · Standards: CE, RoHS

Paddle-wheel flow meter with RS-485

ZJLCD-485 · DN25 / 32 / 40 / 50 / 65 / 80

Three readings at once: instantaneous flow, running total, water temperature
Accuracy ±5% · adjustable K factor per pipe size · units L / Gal / KL
Two NPN control outputs with adjustable delay
Acid and alkali resistant, non-clogging, flow range 0.3–10 m/s

Output: RS485 Modbus RTU/ASCII + NPN · Supply: 10–30 VDC

Three-phase energy meter

Acrel ADW300 · DIN-rail mount inside the distribution box · LCD

Measures U, I, P, Q, S, PF and frequency, with kWh both imported and exported
Class 0.5S accuracy to IEC 62053-22
THDv and 2nd–31st harmonics, plus voltage and current unbalance
A version with split-core CTs (ADW300W) fits without cutting the mains

Output: RS485 Modbus RTU (LoRaWAN / NB-IoT / 4G / WiFi versions available) · Supply: AC 85–465 V or DC 12/24 V · Operating: −20 to +60 °C

Or take it as a package

You do not have to fit everything on day one. The packages below are ordered by what pays back first — start with the readings you need daily, then add the ones you tune the system with.

Starter

A house with nothing measured beyond a thermometer

CO₂ + temperature + humidity, 1–2 points per house
RS485 trunk run with room to expand
Read at the device, or into your existing controller
Mounting positions specified against your house drawing

Recommended for poultry

Standard

The full air picture — enough to answer whether the house is ventilating properly

Everything in Starter
Adds NH₃ at bird level
Adds air velocity for tuning the tunnel
Adds static pressure for setting the inlets
Alarm thresholds configured on every reading

Full system

Farms reporting to an integrator, or watching several houses at once

Everything in Standard
Adds the water flow meter
Adds per-house electricity metering
Gateway collecting and storing history
Mobile dashboard plus alerts to LINE
Placement design, on-site installation and handover training

Pricing depends on house count, number of measurement points, cable runs and site installation, so we quote per farm. Send us your house dimensions and how many you have over LINE and we will come back with a figure.

Frequently asked

How far can the RS485 run, and how many devices on one line?

Up to about 2,000 m on a single twisted pair, with multiple sensors daisy-chained on that same line — each one given its own address. For a house of 100–150 m that is far more than you need, and it is usually enough to bring several houses back to one collection point.

Will it connect to the control system we already have?

Yes, provided your controller or SCADA reads Modbus RTU — the sensors simply join the existing line. The W410G1 air-velocity transmitter also offers 4–20 mA and 0–10 V outputs, so it can feed an analogue input on an older system with no Modbus at all.

Does it need calibration, and what maintenance is involved?

The ammonia sensor is electrochemical with a service life of around 12 months and up, so plan calibration or probe replacement on a cycle. Infrared CO₂ and hot-film air velocity drift far more slowly. ENM can supply calibration certificates for farms that have to pass an integrator or export-buyer audit — tell us when you order.

What happens to the data during a power cut?

The sensors themselves do not store history; the gateway or controller does. We recommend running the sensor set and the gateway from a small UPS, because a power cut is when house conditions change fastest — and that is exactly the data you want to keep.

Can we install it ourselves, or does ENM have to come out?

All of them run on 10–30 VDC and mount to a wall or flange, so a farm technician comfortable with control wiring can fit them, and every model ships with a manual. But placement is what decides whether the readings mean anything. For a first installation we recommend letting us lay out the measurement points.

Need the detailed specifications?

Manuals, Modbus register tables, wiring examples and a measurement-point layout for your own house — ask over LINE. Tell us your house dimensions and how many houses, and we will reply with a proposal that fits the site.

Smart Farm Environmental Sensors