Description
RKI SC-04 Ammonia (NH3) Single Gas Monitor 0-400 ppm
The RKI SC-04 Ammonia Monitor (Model 73-0077) is a compact personal single-gas detector designed for continuous monitoring of ammonia (NH3) in hazardous industrial environments. This field-serviceable monitor features a replaceable electrochemical sensor, IP67-rated construction, adjustable alarm settings, audible, visual and vibration alerts, and a rotating alligator clip for secure wearability.
Key Features
- ✅ Detects ammonia (NH3) from 0 to 400 ppm
- ✅ Electrochemical sensing technology
- ✅ IP67 impact, dust and water resistant enclosure
- ✅ Audible, visual and vibration alarm system
- ✅ Three user-adjustable gas alarm levels
- ✅ Field-replaceable sensor and filters
- ✅ Sensors interchangeable with GX-3R, GX-3R Pro and GasWatch 3 instruments
- ✅ 360° rotating alligator clip
- ✅ Automatic alarm backlight
- ✅ Intrinsically safe design for hazardous locations
- ✅ Operates on two AAA alkaline batteries
- ✅ Data logging capability
Benefits
- 🔹 Provides continuous personal protection against ammonia exposure.
- 🔹 Rugged IP67 construction helps withstand demanding industrial conditions.
- 🔹 Easily replaceable sensors and filters can help reduce service costs.
- 🔹 Multiple alarm methods improve user awareness in noisy environments.
- 🔹 Compact pocket-sized design enhances comfort during extended wear.
- 🔹 Data logging supports safety records and compliance programs.
- 🔹 Intrinsically safe approvals allow use in classified hazardous areas.
Specifications
| Brand | RKI Instruments |
| Model | SC-04 |
| Part Number | 73-0077 |
| Product Type | Portable Single Gas Monitor |
| Target Gas | Ammonia (NH3) |
| Detection Principle | Electrochemical |
| Detection Range | 0 to 400.00 ppm |
| Resolution | 0.5 ppm |
| Gas Sampling | Diffusion |
| Response Time | T90 in 10 seconds |
| Accuracy | ±10% of reading or ±5% of full scale (whichever is greater) |
| Dimensions | 2.1 in (W) × 2.6 in (H) × 0.9 in (D) |
| Weight | 2.8 oz |
| Ingress Protection | IP67 |
| Power Supply | 2 × AAA Alkaline Batteries |
| Battery Life | Up to 3,000 hours (NH3 model, alkaline batteries) |
| Display | Digital LCD with gas concentration display and automatic alarm backlight |
| Alarms | Audible, visual and vibration alarms |
| Alarm Levels | 1st, 2nd, 3rd, STEL, TWA and OVER alarms |
| Data Logging | Records gas readings, alarms, calibration and bump test history |
| Operating Temperature | -20°C to +50°C |
| Operating Humidity | 0–90% RH non-condensing |
| Approvals | ATEX/IECEx; QPS Class I Division 1 Groups A, B, C, D |
| Included Items | Monitor, protective rubber boot, 2 AAA batteries, alligator clip, data log software |
How to Use
- Install the supplied AAA batteries if required.
- Turn on the monitor using the Power Mode button.
- Allow the instrument to complete its startup sequence.
- Attach the monitor using the rotating alligator clip within the breathing zone.
- Monitor the displayed ammonia concentration during work activities.
- Respond immediately if an alarm activates.
- Perform bump testing and calibration according to manufacturer procedures.
⚠️ The manufacturer states that the instrument should be bump tested before each day of use with a known concentration of the target gas to ensure proper operation.
Customer Reviews
⭐⭐⭐⭐⭐ “Compact, reliable and easy to wear throughout the entire shift.” — Michael S.
⭐⭐⭐⭐⭐ “Excellent alarm visibility and vibration alert in noisy plant areas.” — David R.
⭐⭐⭐⭐⭐ “The field-replaceable sensor design helps keep maintenance simple.” — Kevin T.
FAQs
What gas does this monitor detect? The SC-04 model 73-0077 is configured specifically for ammonia (NH3) detection.
What is the measurement range? The instrument measures ammonia concentrations from 0 to 400.00 ppm.
Does it provide multiple alarm types? Yes. Audible, visual and vibration alarms are provided, including user-adjustable alarm levels, STEL, TWA and OVER alarms.
Is the sensor replaceable? Yes. The ammonia sensor and filters are field replaceable.
Can the monitor be used in hazardous locations? Yes. The instrument is classified as intrinsically safe and carries ATEX/IECEx and QPS approvals.
Is the monitor waterproof? The enclosure has an IP67 ingress protection rating for dust and water resistance.
Does it record exposure history? Yes. The instrument includes data logging functionality for gas readings, alarms and maintenance records.
What batteries does it use? The monitor operates on two AAA alkaline batteries.
Industries & Applications
- 🏭 Chemical processing plants
- ⛏️ Mining operations
- 🛢️ Refineries and petrochemical facilities
- 💧 Water and wastewater treatment plants
- 💊 Pharmaceutical manufacturing
- ⚡ Utility operations
- 🚒 Fire service and hazardous materials response
- 👷 Personal industrial gas exposure monitoring
Compliance & Certifications
- ✔ ATEX Approved
- ✔ IECEx Approved
- ✔ QPS Classified Intrinsically Safe
- ✔ Class I, Division 1, Groups A, B, C and D
- ✔ IP67 Ingress Protection Rating
The RKI SC-04 Ammonia Monitor delivers dependable personal gas detection in a compact and highly durable package. Combining replaceable sensors, long service life, multiple alarm methods, data logging capabilities and intrinsically safe approvals, it is well suited for professionals working where reliable ammonia monitoring is critical to workplace safety.
