Specifications BL931700 Range 0.00 to 14.00 pH Resolution 0.01 pH Accuracy (@25°C/77°F) ±0.02 pH Calibration manual, through offset and slope trimmers Dosing Relay maximum 2A (fuse protected), 250 Vac, 30 VDC Dosing Selection acid or alkaline contact open=acid dosage=relay ON if measurement > setpoint contact closed=alkaline dosage=relay ON if measurement < setpoint Setpoint adjustable from 0 to 14 pH Overtime adjustable, from 5 to approximately 30 minutes Recorder Output 4 to 20 mA, accuracy ±0.20 mA, 500 Ω maximum load Input Impedance 10ÐÑ Ohm Power Supply BL931700-0: 12 VDC adapter (included); BL931700-1: 115/230 VAC; 50/60Hz Dimensions 83 x 53 x 99 mm (3.3 x 2.1 x 3.9’’) Weight BL931700-0: 200 g (7.1 oz.); BL931700-1: 300 g (10.6 oz.) Ordering Information BL931700-0 (12 VDC) and BL931700-1 ( 115/230 VAC) are supplied with mounting brackets, transparent cover and instruction manual. Recommended Probe HI1001 PVDF body pH electrode with 1/2” NPT thread, BNC connector and 3 m (9.8’) cable for continuous flowthru monitoring (not included). BL931700 pH Mini Controller with 4-20 mA Recorder Output • Large Clear LCD • Fire Retardant Casing • BNC Connection • Splash-Resistant Cover The BL931700 is a compact single setpoint pH controller designed for applications where space and/or cost are important. Users may choose from automatic or manual dosing modes allowing for easy maintenance and troubleshooting. The device contains a high impedance pH input and may be used with any pH electrode that has a standard BNC connector. Enhanced Accuracy & Precision The BL931700 model o¨ers a manual two-point calibration with pH values displayed out to two decimal places. External Disabling Feature A normally open contact may connect to a level controller or ºow monitor. This safety feature may be used to prevent continuous dosing in the event of specic or undesired system conditions. Adjustable Dosing Relay The BL931700 features a dosing relay which may be congured to dose above or below a user programmable pH setpoint. Selectable Overdose Protection The mini controller may be programmed to deactivate a valve, pump, or connected device if its activation continues over a selected time; adjustable from 5 to 30 minutes. Relay Control Override With the ºick of a switch the mini controller's relay can be disabled (OFF), placed in control (AUTO), or be activated for manual operation (ON) which is useful for priming a dosing pump. Analog Output Communication The BL931700 features a 4 - 20 mA analog output for connection to a data logger, chart recorder, or other device. Matching Pin Connection A built-in matchin pin helps protect the sensor from ground loop e¨ects that may lead to erratic readings or system damage. Fuse Protected Dosing Contacts The relay dosing contact is rated for up to a 2A load and is fuse protected. Easy Peripheral Connection Quick-connect terminal blocks provide for easy connection to power, communication, dosing control, or sensors. See HI1001 pH probe on page 15.86; pH solutions begin on page2.164; see rear connections on page 15.94 15 Process Instrumentation 15.83 www.hannainst.com | controllers
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