FD-92-NH3 Basic Ammonia Meter
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Product Information
Specifications
- Ammonia (NH3) Detection
- Calibration Period
- Gas Sensor Type
- Gas Sensor Life
- Error
- Response Time
- Alarm
- Store / Operating Temp
- Store / Operating Humidity
- Voltage
- Working Time
- Charging Time
- Weight
- Dimensions
Product Usage Instructions
The FORENSICS DETECTORS Basic Ammonia Gas Detector is designed
for easy one-button operation. Follow these steps to use the
detector:
- Press the power button to turn on the detector.
- Ensure the detector is properly calibrated.
- Place the detector in the desired area for monitoring ammonia
levels. - Observe the readings on the display screen for accurate
detection. - If alarm triggers, take necessary precautions as per safety
guidelines. - After use, turn off the detector and store it in a safe
place.
FAQ
Q: How often should I calibrate the ammonia gas detector?
A: The calibration period is specified in the product manual. It
is recommended to follow the calibration schedule to ensure
accurate readings.
Q: What should I do if the alarm goes off?
A: If the alarm triggers, evacuate the area immediately and
follow safety protocols. Identify the source of ammonia and take
necessary steps to mitigate the risk.
Q: Can this detector be used in outdoor environments?
A: The operating conditions of the detector are specified in the
manual. Follow the guidelines to determine if it can be used
outdoors.
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BASIC AMMONIA GAS DETECTOR
User Manual
Model: FD-92-AMMONIA
Manual Print Version: 1.0
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SPECIFICATIONS
Ammonia (NH3) Detection: Calibration Period: Gas Sensor Type: Gas Sensor Life: Error: Response Time: Alarm: Store / Operating Temp: Store / Operating Humidity: Voltage: Working Time: Charging Time: Weight: Dimensions:
0 – 100 ppm with 0.1 ppm resolution 12 months Electrochemical Gas Sensor 2 – 3 years ± 5% F.S < 60 sec LED, Buzzer, and vibration 0°F – 122°F <95%RH DC 3.7V Li-battery 2000 mAh > 24 hours 3 hours 5 oz / 140 g (including battery) 4.3 x 2.3 x 1.7 inches
OUR STORY
Forensics Detectors is a California-based technology leader in advanced gas sensing and measurement solutions. Our mission is to deliver cutting-edge air quality monitoring technology that protects lives and the environment. Based in the stunning Palos Verdes Peninsula of Los Angeles in California, we blend precision engineering with a commitment to safety. Our dedication to excellence drives us to create reliable gas detection systems that set industry standards for accuracy and performance.
INTRODUCTION
The FORENSICS DETECTORS Basic Ammonia Gas Detector is made to be a workhorse with its easy one-button operation. The detector is constructed with a high-quality electrochemical sensor and comes factory-calibrated. Ammonia is a toxic gas that requires continuous detection to ensure wellness for human occupants and your livestock, particularly in occupational spaces and farms. For livestock, here are some important Ammonia levels to consider:
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Levels (ppm)
< 10ppm 10-20ppm 10ppm 20ppm 20-25ppm
25ppm 30ppm
50ppm >50ppm >100ppm >100200ppm
Effects
Ideal exposure limit
Levels in ventilated buildings with liquid manure systems
Trachea irritation
Increased susceptibility to Newcastle disease
Increased susceptibility to secondary challenges, decreased feed efficiency, tissue damage
Maximum suggested exposure limit before harmful effects Causes local and systemic lowgrade inflammation
Levels in buildings with solid floors where manure & urine exist
Increased keratoconjunctivitis and tracheitis
Significantly increased mortality
Levels found in poorly ventilated buildings
Animal
All livestock All livestock Turkeys Poultry
Poultry
All livestock Laying hens
All livestock Poultry
Chicks
All livestock
Notes
Less than 10 ppm is the ideal limit for exposure Typical ammonia levels with liquid manure systems Trachea irritation was shown in turkeys > 20 ppm, increased rate of infection of Newcastle disease was found Exposure to 2025 ppm throughout production can result in increased susceptibility to secondary challenges, decreased feed efficiency and tissue damage Best to keep less than 25ppm. Systemic low-grade inflammation based on its levels and exposure durations Levels can exceed 50 ppm with lower winter ventilation rates > 50 ppm, increased levels of keratoconjunctivitis and tracheitis observed At above 100 ppm, the chick mortality was increased significantly Levels can reach 100 to 200 ppm in poorly ventilated buildings
Poultry manure contains twice as much ammonia as dairy cattle manure. In
order of greatest ammonia manure content to least is: chickens, pigs, dairy cows, and beef cows. Ammonia levels are typically 518 ppm in confinement swine barns, 38 ppm in open dairy barns, and 10100 ppm in confined
poultry facilities.
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Below we present a table of human ammonia exposure limits:
Agency Limit Type
OSHA PEL-
TWA OSHA STEL NIOSH REL-
TWA NIOSH STEL NIOSH IDLH
Value (ppm)
50
35 25
35 300
Exposure Duration
8-hour
15-minute 10-hour
15-minute Immediate
ACGIH ACGIH
TLV-
25
TWA
TLV-STEL 35
8-hour 15-minute
AIHA
ERPG-1 25
Emergency
AIHA
ERPG-2 200
Emergency
AIHA
ERPG-3 1,000
Emergency
Description
Permissible Exposure Limit legally enforceable standard Short-Term Exposure Limit Recommended Exposure Limit advisory guideline Short-Term Exposure Limit Immediately Dangerous to Life or Health Threshold Limit Value recommended guideline Threshold Limit Value – ShortTerm Exposure Minimal effects/mild, transient irritation Serious health effects, ability to take protective action not impaired Life-threatening health effects
Abbreviations:
· OSHA: Occupational Safety and Health Administration · NIOSH: National Institute for Occupational Safety and Health · ACGIH: American Conference of Governmental Industrial Hygienists · AIHA: American Industrial Hygiene Association · PEL: Permissible Exposure Limit · REL: Recommended Exposure Limit · TLV: Threshold Limit Value · TWA: Time-Weighted Average · STEL: Short-Term Exposure Limit · IDLH: Immediately Dangerous to Life or Health · ERPG: Emergency Response Planning Guideline
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DESIGN
The FD-92-AMMONIA has five buttons:
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The FD-92-AMMONIA has 3 operating LED mode indicators:
QUICK START AMMONIA Detection
1. Turn ON the detector. After device self-test the unit is READY. 2. Start measuring. Real-time measurements are shown on the HOME
screen in ppm concentration. PPM stands for “parts per million”. 3. Move the sensor slowly at a inspection site. Ammonia gas levels will be
shown on the display. 4. The unit will flash GREEN LED in normal operating mode.
When the alarm has triggered, RED LED will flash rapidly. 5. By pressing the left or right button you can toggle between instantaneous
levels (left image) and time series bar graph (right image).
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DISPLAY ICONS
On the top of the FD-92-AMMONIA display is a row for notification icons.
MENU FUNCTIONS
When in the main screen, press OK to enter the Main Menu.
· Alarm Records: Shows recorded alarm triggers with time and date stamp. Triggers when low and high alarms are triggered.
· Alarm Settings: Settings for low and high alarm points.
· Calibration: Settings for ZERO and Span Calibration.
· System Settings: Allows to change the time, date, displays and alarm modality.
· Information: General detector information.
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ALARM RECORDS – Menu
The alarm record of the equipment includes alarm trigger events. The alarm record stamps the alarm trigger time, alarm type, gas type, alarm point, the starting value of gas concentration triggering the alarm, the maximum value of gas concentration after triggering the alarm, and the duration of the alarm.
ALARM SETTINGS – Menu
Low Value: When the gas concentration exceeds this value, a low alarm will be triggered. High Value: When the gas concentration exceeds this set value, a high alarm will be triggered. Low Backlash: The low alarm hysteresis is a parameter that prevents frequent toggling of the alarm due to fluctuations near the low alarm value. A low alarm is triggered when the gas concentration exceeds the set value, but it will only be cleared when the concentration drops below the set value minus the low backlash value. For example, if the low alarm value is 80ppm and the low backlash is 5ppm, the alarm will only clear when the concentration drops below 75ppm. High Backlash: A parameter that prevents frequent toggling of the alarm due to fluctuations near the high alarm value. A high alarm is triggered when the gas concentration exceeds the set value, but it will only be cleared when the concentration drops below the set value minus the high backlash value. For example, if the high alarm value is 90ppm and the high backlash is 5ppm, the high alarm will only clear when the gas concentration reaches 85ppm.
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CALIBRATION – Menu
What is CALIBRATION? Your FD-92-AMMONIA comes already calibrated. However, calibration is an important function to be performed to ensure your gas detector operates accurately. We recommend annual calibration. Accuracy and Calibration drift can happen over time because of chemical degradation of sensors and the natural drift in electronic components. There are two parts to the calibration, ZERO Calibration and SPAN Calibration.
ZERO CALIBRATION: Ensures a good baseline to ZERO target gas exposure. This ensures the detector reads a true ZERO. At times you may experience the unit is not reading exatly ZERO in fresh air. In this case, you can perform a ZERO calibration to readjust the ZERO point. Select ZERO and press Enter.
SPAN CALIBRATION: Ensures accurate gas concentration reading in ppm. To undertake a span calibration, you need ammonia calibration reference gas, a gas regulator and tubing. This is a detailed and technical procedure and best described via our YouTube step by step tutorial found on our website under the main Calibration menu, then select FD-92.
What is Bump Testing? Bump testing is a quick procedure to expose the gas detector to a small amount of “blast” target gas to ensure the detector operates and alarms as programmed. The function of this test is to verify detection operation and build user confidence, particularly in hazardous and critical user applications. Recommended to bump test when first purchased and unpacking detector and before use. You can do this by exposing the gas detector to ammonia bump gas.
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SYSTEM SETTINGS – Menu
The system settings menu helps you adjust certain parameters of the gas detector for customization and a better user experience. Options include:
Date and Time: Display: Notifications: Factory Reset:
Adjust the date and time to your local settings. Change screen brightness and auto sleep settings. Toggle options for light, vibrator, and buzzer operation. ONLY do this if confirmed by our technical team.
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7IN. AFDOVRAMNCAETDIOMNEN-UMenu
Some basic gas detector information that may be required for identification and troubleshooting.
Device information: Includes device name, software version, hardware version, and product ID.
Operational Status: Includes battery voltage, charge status, temperature, sensor ADC (Analog-to-Digital Converter), boot status, and uptime.
BATTERY CHARGING
The FD-92-AMMONIA has a built-in lithium battery and can be charged via Type C USB cable. USB Charger should be rated >1.0A for fast charging. Before charging, TURN OFF the analyzer to avoid any potential damage. Charging takes about 4 hours. When active in charging, an animated battery icon will appear to indicate charging is in progress. When done, “Charging Complete” will appear.
MEASUREMENT
Gas Monitoring: When the analyzer is in the ON state, it is presenting the live, continuously ammonia gas sensor concentration readings. The data displayed updates twice per second. Walk slowly from location to location to obtain various indoor ammonia gas concentration levels. To get a true reading, ensure unit is stationary for at least 2 minutes in one location. Beware, that ventilation and height can impact an ammonia reading, and rarely will one obtain consistent results.
Maximum Concentration: When you have reached the maximum detection limit of the sensor, it will read “100”. When this occurs, seek fresh air otherwise the sensor can be damaged and poisoned.
Alarming: The analyzer has LED, BUZZER and VIBRATION alarm modes. These can be disabled.
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WARNING
· Read, understand, and adhere to all instructions to ensure safe operation – failure to comply may result in serious injury or death from explosive gases.
· Incorrect calibration in contaminated areas may result in false readings.
· Do not store the detector with water, solvents, acids, or corrosive substances – avoid extreme temperatures, high humidity, electromagnetic fields, and intense sunlight.
· If detecting gas or feeling unwell, immediately evacuate the area and seek fresh air.
· Follow instructions carefully as the detector is highly sensitive to ensure accurate readings and personal safety.
· Ensure the analyzer is stored in a room temperature environment with moderate humidity, not exceeding 95%RH with no mechanical vibration.
· Ensure the environment is not corrosive, no chemical vapors.
This product is covered by a one-year limited warranty. This warranty does not cover damage resulting from accident, misuse, disassembly, abuse or lack of reasonable care of the product, or applications not in accordance with the user manual. It does not cover events and conditions outside of our control, such as Acts of God (fire, severe weather etc.). It does not apply to retail stores, service centers or any distributors or agents. We will not recognize any changes to this warranty by third parties. We shall not be liable for any incidental or consequential damages caused by the breach of any express or implied warranty. Except to the extent prohibited by applicable law, any implied warranty of merchantability or fitness for a particular purpose is limited in duration for 1 year. THIS PRODUCT CANNOT BE REPAIRED IF THE UNIT IS TAMPERED WITH IT WILL INVALIDATE THE GUARANTEE. IF THE UNIT IS FAULTY PLEASE RETURN IT TO YOUR ORIGINAL SUPPLIER WITH YOUR PROOF OF PURCHASE.
Copyright © 2025, FORENSICS LLC, all rights reserved. FORENSICS, FORENSICS DETECTORS are registered trademarks of FORENSICS LLC. All other trademarks, trade names, service marks and logos referenced herein belong to their respective companies.
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SUPPORT
Forensics Detectors has a dedicated support team. You can email our Chief Engineer directly at drkoz@forensicsdetectors.com or visit our website for further information. Web: www.forensicsdetectors.com Email: sarah@forensicsdetectors.com
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Documents / Resources
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FORENSICS DETECTORS FD-92-NH3 Basic Ammonia Meter [pdf] User Manual FD-92-NH3, FD-92-AMMONIA, FD-92-NH3 Basic Ammonia Meter, FD-92-NH3, Basic Ammonia Meter, Ammonia Meter, Meter |