- rkic1976@gmail.com
- 12, Dhamanwala Complex-200, GIDC, Pandesara, Surat – 394221
+91 98241 36145
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R.K. Instruments & Controls
Our Products
Process Control Machinery
RK Instruments delivers precise, reliable machinery including testing, measuring, calibration, and process control systems.
Our Products
Process Control Machinery
RK Instruments delivers precise, reliable machinery including testing, measuring, calibration, and process control systems.
| Physical & Operational Characteristics | |
|---|---|
| Length | 500 mm |
| Connection | DN150 flange |
| Pressure Range | PN16 / PN25 |
| Protection Class (Flow Part) | IP68 |
| Temperature Range | 5 – 130 °C |
| Permanent Temperature | 130 °C |
| Pressure Loss at qp | < 120 mbar |
| Flow & Classification Data | |
| Nominal Flow (qp) | 150 m³/h |
| Maximum Flow (qs) | 300 m³/h |
| Minimum Flow (q1) | 1500 l/h |
| Response Threshold | 600 l/h |
| Overload Flow | 2.8 × qp |
| Metrological Class | 1 |
| Accuracy Class | 2 |
| Environmental Class | E1 and M1 |
🔹 Product Features
- L+G ultrasonic technology: proven, precise, stable
- Maintenance-free design with no moving parts
- Exchangeable measurement unit: no need to remove flanged body, no special tools required
- Cost-saving recalibration: minimal mounting effort and low operating/switching costs
- V4A stainless steel construction: robust, durable, corrosion-resistant
- No mounting restrictions: no straight pipe sections required; shaft fitting possible
- Compatible electronics: full functionality of T550 (UH50…) or T150 (2WR7..)
- T550 power options: available with power supply or battery lasting up to 16 years
💧 Waterproof – The Flow Part
- Material: Flow part and measurement insert are made of high-quality stainless steel.
- Waterproof Rating: Certified to IP68, ensuring full protection against water ingress.
- Flexible Installation: Electronic unit can be mounted separately with a maximum cable length of 5 meters.
- Harsh Environment Ready: Designed to operate reliably even in tough environmental conditions.
- Universal Functionality: Electronic unit functions identically across different nominal sizes.
- Service Compatibility: No need for new products for service or communication—ensures seamless integration.
| 1804 PFM Series (2–30 PSIG Outlet Pressure) | |
|---|---|
| Model Number | Description |
| 1804 PFM | Standard regulator |
| 1804M PFM | Standard regulator with external sense |
| 1884 PFM | Standard regulator with overpressure shut-off |
| 1884M PFM | Standard regulator with external sense and overpressure shut-off |
| 1884 PFM w/USSA | Standard regulator with overpressure and under pressure shut-off |
| 1884M PFM w/USSA | Standard regulator with external sense, overpressure and under pressure shut-off |
| 1805 PFM Series (7″ WC–2 PSIG Outlet Pressure) | |
| Model Number | Description |
| 1805 PFM | Standard regulator |
| 1805M PFM | Standard regulator with external sense |
| 1885 PFM | Standard regulator with overpressure shut-off |
| 1885M PFM | Standard regulator with external sense and overpressure shut-off |
| 1885 PFM w/USSA | Standard regulator with overpressure and under pressure shut-off |
| 1885M PFM w/USSA | Standard regulator with external sense, overpressure and under pressure shut-off |
📦 Ordering Information
- Model Number
- Connection Size:
- 1-1/2″ Threaded
- 2″ Threaded
- 2″ Flanged
- Inlet Pressure Range: Up to 125 PSIG
- Outlet Set Pressure: 7″ WC to 30 PSIG
- Main Orifice Diameter Options:
- 1/4″, 3/8″, 1/2″, 5/8″, 3/4″, 7/8″, 1″, 1-1/4″
- Gas Specific Gravity
- Regulator Assembly Position: Refer to configuration guide
- Pilot Filter Option: Yes / No
- OPSO Spring Range
- Under Pressure Spring Range (USSA only)
📘 General Information
- Max Inlet Pressure: 125 PSIG
- Operating Temperature: -20°F to 150°F (–30°C to 65°C)
- Max Flow Rate: Up to 80,000 SCFH
- Connection Options:
- 1/2″ or 2″ NPT
- 2″ ANSI Class 150 Flange
- Flat Faced Flanged Connection
⚙️ Enhancements
Extended outlet pressure range: 7″ WC to 30 PSIG
Reduced pilot maintenance size
1805 pilot optimized for 7″ WC to 2 PSIG outlet range
Three closing spring options for improved lock-up
⭐ Features
Rugged PFM design with proven reliability
Expanded orifice options: now includes 1/2″ and 3/4″ sizes
Maintains outlet pressure within ±0.5% of setpoint across wide flow range
Ideal for low flow measurement
Optional safety features:
OPSO (Over Pressure Shut Off)
USSA (Universal Safety Shut Off)
Internal relief (safety orifice)
🔧 Pilot Options
1804 PFM Series (2–30 PSIG Outlet Range):
Spring ranges:
2–10 PSIG
2–30 PSIG
1805 PFM Series (7″ WC to 2 PSIG Outlet Range):
Spring ranges:
7″–30″ WC
1.0–2.4 PSIG
| Size | Outlet Pressure Range (mbar) | Outlet Pressure Range (ins wg) | Spring Number | Spring Colour | Regulator Model |
|---|---|---|---|---|---|
| DN 50 FL & DN 80 FL | 12 – 20 | 5 – 8 | Self | Light Green | 280H/282H |
| DN 50 FL & DN 80 FL | 20 – 35 | 8 – 14 | 766 | Light Blue | 280H/282H |
| DN 50 FL & DN 80 FL | 35 – 50 | 14 – 20 | 767 | Grey | 280H/282H |
| DN 50 FL & DN 80 FL | 50 – 75 | 20 – 30 | 768 | Brown | 280H/282H |
| DN 50 FL & DN 80 FL | 75 – 120 | 30 – 48 | 769 | Orange | 280H/282H |
| DN 50 FL & DN 80 FL | 120 – 180 | 48 – 72 | 770 | Dark Blue | 280H/282H |
| DN 100 FL | 12 – 20 | 5 – 8 | 772 | White/Maroon | 280 |
| DN 100 FL | 20 – 35 | 8 – 14 | 773 | Black/Maroon | 280 |
| DN 100 FL | 35 – 50 | 14 – 20 | 774 | Green/Maroon | 280 |
| DN 100 FL | 50 – 75 | 20 – 30 | 775 | Red/Maroon | 280 |
| DN 100 FL | 75 – 120 | 30 – 48 | 776 | Grey/Maroon | 280 |
| DN 100 FL | 120 – 180 | 48 – 72 | 777 | Orange/Maroon | 280 |
| DN 100 FL | 180 – 300 | 72 – 120 | 778 | Stone/Maroon | 280 |
| DN 100 FL | 180 – 300 | 72 – 120 | 778 | Stone/Maroon | 284 |
| DN 100 FL | 300 – 450 | 120 – 180 | 779 | Red – Black | 284 |
| DN 100 FL | 450 – 675 | 180 – 270 | 780 | Green – Brown | 284 |
| DN 100 FL | 675 – 1000 | 270 – 400 | 781 | Yellow – Blue | 284 |
| DN 100 FL | 1000 – 1400 | 400 – 560 | 1168 | Grey | 284 |
| DN 100 FL | 1400 – 2000 | 560 – 800 | 1169 | Brown | 284 |
| DN 100 FL | 2000 – 2500 | 800 – 1000 | 1170 | Orange – Brown | 284 |
| Regulator Model | Size | Dimensions (mm) | Weight (Kg) | |||||||
|---|---|---|---|---|---|---|---|---|---|---|
| A | B | C | D | E | F | Cartridge | Body | Total | ||
| 280 | DN 100 | 352 | 451 | 187 | 635 | 140 | 845 | 40.8 | 27.6 | 68.4 |
| 280H & 282H | DN 50 | 298 | 380 | 190 | 425 | 126 | 640 | 21.5 | 13.2 | 34.7 |
| 280H | DN 80 | 298 | 380 | 142 | 425 | 126 | 640 | 21.5 | 11.8 | 33.3 |
| 284 | DN 50 | 298 | 290 | 190 | 425 | 126 | 640 | 17.0 | 6.3 | 23.3 |
| 284 | DN 80 | 298 | 290 | 142 | 425 | 126 | 640 | 17.0 | 6.7 | 23.7 |