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 10¹² 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 offers 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 flow monitor. This safety feature may be used to prevent continuous dosing in the event of specific or undesired system conditions. Adjustable Dosing Relay The BL931700 features a dosing relay which may be configured 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 flick 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 effects 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 15.88; pH solutions begin on page2.158; see rear connections on page 15.96 15 Process Instrumentation 15.85 www.hannainst.com | controllers
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