BL 7917
ORP Controller and Chemical Dosing Pump
•ORP controller and dosing pumps in one compact unit.
•±5 mV accuracy with unbeatable performance.
•Isolated 4 to 20 mA recorder output.
•Proportional dosing slows the pump down when the measured ORP level approaches the set value, to avoid over dosage of oxidizing or reducing agents.
•Alarm contact is activated whenever the ORP reading varies more than 200 mV from the set point.
•Auxiliary contacts allow users to attach a mixer or priming pump that is activated only when the pump is dosing
•PVDF, FPM/FKM and PTFE materials are used for all parts that come into contact with liquid.
The controller/pump is enclosed in a modular housing for maximum protection. The pump utilizes a one-piece polypropylene, injection-molded housing. Since there are no joints or screws holding different sections of the housing together, the case is extremely rugged and sturdy. This series of instruments will mount easily in your plant using a minimum of wall space. The controls and pump head are located in the front to allow easy access.
Specifications
Range -999 mV to +999 mV
Resolution 1 mV
Accuracy ±5 mV
Flow Rate 13.3, 11.7, 10.1, 9.0, 7.8 (LPH)
Input Impedance 1012 Ohm
Dosage proportional, oxidizing or reducing, user selectable
Recorder Output 4-20 mA (isolated)
Dosing Contact 1 isolated contact, 2A, Max. 240V, resistive load, 1,000,000 strokes
Alarm Contact 1 isolated contact, 2A, Max. 240V, resistive load, 1,000,000 strokes
Power Supply BL 7917-1: 115V ±15%; 50/60Hz (40W)
BL 7917-2: 230V ±15%; 50/60Hz (40W)
Environment 0 to 50°C (32 to 122°F); RH max 95% non-condensing
Dimensions 221 x 142 x 181 mm (8.7 x 5.6 x 7.1′)
Weight 5 kg (11 lb.)
Accessories
Solutions
HI 7020L ORP Test Solution at 200/275 mV (@20°C)
1 x 500 mL bottle
HI 7091L Reducing Pretreatment Solution
1 x 500 mL bottle
HI 7092L Oxidizing Pretreatment Solution
1 x 500 mL bottle
Accessories
HI 8427 pH and mV Precision Simulator
HI 931001 pH and mV Precision Simulator
HI 721101 Pump head, O-ring, screws (6 pcs) and washers (6 pcs)
HI 721102 Discharge valve assembly
HI 721103 Suction valve assembly
HI 721004 Injection Valve Assembly
HI 721005 Foot Valve Assembly
HI 721008 Ceramic weight
