Description
Solenoid-Driven Chemical Metering Pump With Dual Manual Stroke And Speed Control
The LMI C Series two-dial chemical metering pump delivers accurate chemical injection across a wide flow and pressure range. Independent stroke length and stroke frequency dials provide a 1000:1 turndown ratio. The clear acrylic pump head allows visual confirmation of diaphragm operation and chemical flow during dosing cycles.
Quick Specs
- Pump Type: Solenoid-driven, positive displacement, Liquifram diaphragm
- Max Flow Rate: Up to 20 GPH (480 GPD), depending on model
- Max Pressure: Up to 300 PSI, depending on model
- Turndown Ratio: 1000:1
- Voltage: 120 VAC
- Average Input Power: 44 watts at max speed
- Enclosure: NEMA 4X / IP65, chemical-resistant glass fiber reinforced thermoplastic
- Certifications: UL, cUL, NSF 50, NSF 61, NSF 372, CE
- Pump Head: Clear machined acrylic with ceramic check valve balls
Key Features of the LMI C Series Two-Dial Chemical Metering Pump
- Two independent control dials adjust stroke length and stroke frequency from 1 to 100 strokes per minute, giving operators a 1000:1 turndown ratio without external controllers or signal inputs.
- Clear acrylic pump head provides direct visibility into chemical flow and diaphragm movement, allowing quick confirmation that the pump is dosing correctly.
- NEMA 4X / IP65 enclosure with totally encapsulated electronics protects against moisture ingress and corrosive fumes in chemical feed rooms.
- Ships with a complete installation kit: foot valve with ceramic weight, injection valve, four-function discharge valve, and polyethylene chemical tubing.
- The four-function discharge valve combines pressure relief, anti-siphon, back pressure, and priming/degassing functions into a single compact unit.
- Compatible with common water treatment chemicals including sodium hypochlorite, caustic soda, aluminum sulfate, citric acid, PAC, and hydrochloric acid.
- Available with AutoPrime (degassing) liquid end configurations on C11, C12, and C13 models to handle off-gassing chemicals like sodium hypochlorite without vapor lock. Cleanflow also carries LMI liquid end replacement kits for field conversion.
LMI C Series Two-Dial Chemical Metering Pump Specifications
| Category | Details |
|---|---|
| Brand | LMI (Milton Roy) |
| Series | C Series, Type C1 (Two-Dial Manual) |
| Pump Type | Solenoid-driven, positive displacement, Liquifram diaphragm |
| Control Method | Dual manual dials: stroke length + stroke frequency |
| Strokes Per Minute | 1 to 100 (adjustable) |
| Minimum Stroke Length | 10% |
| Turndown Ratio | 1000:1 |
| Max Flow Rate (C1 Series Range) | 1.3 GPH to 20 GPH (31 GPD to 480 GPD) |
| Max Pressure (C1 Series Range) | 25 PSI to 300 PSI |
| C101: Max Flow / Pressure | 1.3 GPH (31 GPD) / 300 PSI |
| C111: Max Flow / Pressure | 2.5 GPH (60 GPD) / 150 PSI |
| C121: Max Flow / Pressure | 4.0 GPH (96 GPD) / 100 PSI |
| C131: Max Flow / Pressure | 8.0 GPH (192 GPD) / 60 PSI |
| C141: Max Flow / Pressure | 20.0 GPH (480 GPD) / 25 PSI |
| Voltage | 120 VAC (Voltage Code 1, US Plug) |
| Average Input Power | 44 watts at max speed |
| Pump Head Material Options | Clear machined acrylic, PVC, PVDF |
| Wetted Materials Options | PVC, PVDF, polypropylene, 316 stainless steel, acrylic, UHMW PE |
| Diaphragm Material | Fluorofilm™ (PTFE/PFA copolymer) across all models |
| Check Valve Materials | PVDF/Polyprel®, PVDF/PTFE, PTFE, Viton®, 316 S.S. (varies by liquid end) |
| Check Valve Balls | Ceramic (316 S.S. on select liquid ends) |
| Enclosure Rating | NEMA 4X / IP65 |
| Housing Material | Chemical-resistant glass fiber reinforced thermoplastic |
| EPU Carrier | Glass fiber reinforced polypropylene |
| Tubing (Standard) | 3/8" OD polyethylene (C10/C11/C12); 1/2" OD polyethylene (C13/C14) |
| Connection Options | 3/8" OD PE tubing, 1/2" OD PE tubing, 1/4" NPT male, 1/2" NPT male |
| Certifications | UL, cUL, NSF 50, NSF 61, NSF 372, CE |
| AutoPrime Liquid End | Available for C11, C12, C13 models only (not C10 or C14) |
| Liquid End Options | Standard, AutoPrime (degassing), High Viscosity, Legacy LMI |
| Included Accessories | Foot valve with ceramic weight, injection valve, four-function discharge valve, PE chemical tubing |
| Optional Accessories | Calibration column, low-level float switch, repair and preventive maintenance kits |
| Shipping Weight | 20 lbs (9.1 kg) |
AutoPrime Liquid End Output (Reduced)
AutoPrime liquid ends use a continuous bleed valve that vents trapped gas back to the chemical tank on each stroke. This reduces maximum output slightly compared to standard liquid ends:
| Model | Standard Max Output | AutoPrime Max Output | Max Pressure |
|---|---|---|---|
| C11 series | 2.5 GPH | 2.3 GPH | 150 PSI |
| C12 series | 4.0 GPH | 3.8 GPH | 100 PSI |
| C13 series | 8.0 GPH | 7.8 GPH | 60 PSI |
Performance Overview
The LMI C Series two-dial chemical metering pump covers flow rates from 1.3 to 20 GPH at pressures up to 300 PSI, with a 1000:1 turndown ratio across all C1 models.
Construction and Design
| Component | Details |
|---|---|
| Enclosure | NEMA 4X / IP65, glass fiber reinforced thermoplastic |
| Electronics | Totally encapsulated solid-state pulser, sealed against moisture and corrosive atmospheres |
| Pump Head (Acrylic Models) | Clear machined acrylic for visual flow verification |
| Check Valve Balls | Ceramic (316 S.S. on select high-viscosity and stainless liquid ends) |
| Diaphragm | Fluorofilm™ (PTFE/PFA copolymer); branded as Liquifram by LMI |
| Discharge Valve | Four-function: pressure relief, anti-siphon, back pressure, priming/degassing |
| Foot Valve | Includes ceramic weight for suction line stability |
| Suction/Discharge Tubing | 3/8" OD polyethylene (C10-C12); 1/2" OD PE (C13-C14); vinyl suction tubing on HV models |
| Seal System | O-ring sealed fittings; no PTFE tape or pipe dope required |
| Drive | Totally enclosed solenoid; no exposed moving parts |
Applications
- Municipal drinking water chlorination and disinfection
- Wastewater pH adjustment with caustic soda or acid feed
- Boiler feedwater chemical treatment (corrosion inhibitors, oxygen scavengers)
- Cooling tower biocide and scale inhibitor injection
- Reverse osmosis antiscalant and post-treatment chemical dosing
- Food and beverage process water sanitation
- Aquaculture and hatchery water treatment
Buy LMI C Series Chemical Metering Pump Online from Cleanflow
Order the LMI C Series two-dial chemical metering pump from Cleanflow. The LMI C Series has been a field-proven chemical metering pump for decades, handling corrosive chemicals across municipal, industrial, and commercial water systems. Cleanflow carries the full C Series lineup as an authorized LMI distributor, with inventory ready to ship across Canada and the United States. Technical support, replacement liquid ends, and LMI pump repair parts are all available through Cleanflow.
Browse the full LMI metering pumps and control equipment collection.
Frequently Asked Questions
What is the difference between the LMI C1 and C7 Series pumps?
The C1 (two-dial) uses manual stroke length and stroke frequency dials for output adjustment. The C7 adds a three-position switch for selecting between internal pacing, external pulse input, or off. Both share the same liquid end and housing platform.
What chemicals can the LMI C Series pump handle?
The C Series handles standard water treatment chemicals including sodium hypochlorite, caustic soda (NaOH), hydrochloric acid, aluminum sulfate, citric acid, PAC, and coagulants. Material compatibility depends on the liquid end configuration. Always verify against LMI's chemical resistance chart before selecting wetted materials.
How do I prime an LMI C Series metering pump?
LMI pumps ship pre-primed with water. If the solution is incompatible with water, disassemble the pump head and dry all components before filling with your chemical. Use the four-function valve's priming/degassing function to evacuate air from the liquid end during initial startup.
What does the clear acrylic pump head do?
The clear acrylic head lets operators visually verify that the diaphragm is stroking and chemical is flowing through the pump head. This makes it faster to diagnose air-lock, loss of prime, or diaphragm failure without disassembly.
How often should I replace the diaphragm and check valves?
Replacement intervals depend on the chemical being pumped, concentration, and operating hours. LMI recommends inspecting the liquid end at regular intervals and keeping a preventive maintenance kit on hand. Sodium hypochlorite applications typically require more frequent replacement than mild pH chemicals.
Can I use the LMI C Series pump for off-gassing chemicals like chlorine?
The standard C1 acrylic head works for many chemicals. For off-gassing chemicals like sodium hypochlorite or bleach, LMI offers the AutoPrime (degassing) liquid end option, which automatically vents accumulated gas back to the solution tank on each stroke, preventing vapor lock. AutoPrime liquid ends are available for C11, C12, and C13 models.
Do I need a back pressure valve with this pump?
The included four-function discharge valve provides back pressure, anti-siphon, pressure relief, and priming/degassing functions. In most installations, no additional back pressure valve is required. If system back pressure exceeds the pump's rated pressure, a separate pressure relief valve may be needed.
What tubing should I use with the LMI C Series?
Use only LMI-supplied polyethylene tubing, which fits the pump's compression fittings and is rated for chemical service. Standard tubing is 3/8" OD for C10, C11, and C12 models, and 1/2" OD for C13 and C14 models. All fittings use O-ring seals; do not apply PTFE tape or pipe dope.
Similar Products
Featured collection
