INTRINSICALLY SAFE DRUM LEVEL ALARM monitors high liquid level in drums by beeping and flashing.
Better Level Control
- Always on duty because battery power is uninterruptible.
- Replaceable battery lasts for years.
- Loud buzzer is 102 dB @ 2 ft. (like a smoke alarm)
- Class 1, Div. 1. Gas groups C and/or D.
- Rugged. Built for rough, wet and outdoor environments.
- Low battery alert.
- Optional relay output.
Intrinsically Safe Drum Alarm
The Intrinsically Safe high level drum alarm responds to a high or low level condition, with a loud buzzer and flashing LED. The buzzer is loud at 98dB measured at two feet, and since it has a unique warbling sound, it cuts through factory noise so it will be heard. The unit is rated for Class 1, Division I Hazardous Locations and, because it is battery powered, it can be placed in service instantly.
Easy to Install. Different drum mountings are all adjustable by hand. Simply loosen the nut or thumbscrew, and slide the alarm to the depth you want. Alternatively, we offer many choices of other drum mounts if preferred.
CONSTRUCTION
Durable construction from an aluminum electronics enclosure. Lexan LED lens, metal pushbutton. The float switch is protected inside a sturdy guard so it can be moved from drum-to-drum without worrying about damage. The enclosure is waterproof and rated IP65.
BATTERY POWER
Battery Power is uninterruptible and allows installation anywhere. No outlets, electricians, or inspectors needed. The batteries are designed to last for years. This is possible because we start with a lithium battery that has a shelf life of 20 years. Also, the battery capacity is a remarkable 2400 mA-hr. This, combined with firmware that puts them into a low output mode after 1 hour, allows these to sound for almost a month straight if unattended! Of course this will never happen but its nice to know they can. Furthermore, when the batteries do run low, a low-battery signal is given, which is different from the level alarm signal to make it easy to identify. Finally, the battery is easily replaceable in the hazardous location.
OPERATION
Different behaviors are field-selectable using DIP switches on the circuit board. For use on drums, the most popular would be the ability to enable or disable the 30-minute snooze alarm. If enabled, the LED continues to flash after the buzzer is silenced. After 30 minutes, the buzzer will sound again until the level is corrected. In addtion there are other behaviors available that are mostly related to the relay output. More details on these are in the documents section below.
MODELS
Models with an alarm only (no liquid feed pipe) mount in the 3/4″ drum bung. They are available for high liquid level (IS-DHK-SS) and also for low. (IS-DLK-SS)
Models with a liquid feed pipe have two pipes and require mounting in the 2″ drum bung using our “tall” drum plug. Please contact sales for more information on these.
OVERALL
- Enclosure material………………………….. Aluminum
- Buzzer volume…………………………………102 dB @ 2ft.
- Operating temp (ambient)………………. -40 to 60ºC (-76-140ºF)
- Max. liquid temperature…………………149ºC [300ºF]
- Ingress protection……………………………. IP65
- Current consumption during alarm….….30mA
- Relay current (max.)……………………..80mA max.
- Lens material……………………………………Lexan
- Stainless steel…………………………………..316 except retaining rings are type PH 15-7 Mo
- Cable capacitance (if applicable)…..…….30pf/ft
BATTERY
- Battery capacity………………………………. 2400 mA-hr
- Battery chemistry……………………………..Lithium Thionyl Chloride
- Battery pack voltage…………………………7.2VDC
- Lithium weight…………………………………1.2g (per pack of 2 cells)
Link to battery datasheet
STAINLESS DRUM MOUNTING COLLAR
- Body material………………………………316 SS
- Body thread pitch………………………… ¾” NPT
- Thumbscrew head material……………… 304 SS
- Thumbscrew head pitch……………………M8 x 1.25
- Thumbscrew head material……………… Phenolic thermoset resin. (bakelite)
FLOAT SWITCH
- Float S.G (stainless)………………………….0.60
More information about the float switch on this page.
Specification sheet for IS-DHK
CSA has certified this unit to the following standards:
- CSA CAN/CSA C22.2 No. 0-10
- CSA CAN/CSA-22.2 No. 60079 0-15
- CSA CAN/CSA-22.2 No. 60079-11-14
- CSA CAN/CSA-22.2 No. 1010-1012
- C22.2 No. 60529:16
- ANSI/ISA-60079-0 (12.00.01)-2013
- ANSI/ISA 60079-11 (12.02.01)-2014
- ANSI/UL 61010-1, 3rd Ed.
- UL913, 8th Ed.
Ex ia IIB T4 Ga
Class I, Zone 0, AEx ia IIB T4 Ga
Class I, Div. 1 Groups C and D T4, IP65
(enter CSA File number 263009 in CSA’s “file number” field)
The wetted parts are available in 316 stainless steel except the retaining rings on the float switch which are 15-7SS. Click here for chemical resistance chart.
The alternative construction is polypropylene which is suitable for temperatures up to 200 deg. F [93C] Click here for a chemical resistance chart.
We stock other materials too like PTFE and Kynar. Please call us for more information on these.
EXAMPLES
DHP DHB DHK
IS-DHP-PP-7 IS-DHB-PP-7 IS-DHK-PP-7 PP (polypropylene pipe + polypropylene float)
IS-DHP-SB-7 IS-DHB-SB-7 IS-DHK-SB-7 SB (stainless pipe + BUNA float)
IS-DHP-SS-7 IS-DHB-SS-7 IS-DHK-SS-7 SS (stainless pipe + stainless float)
IS-DHP-SF-7 IS-DHB-SF-7 IS-DHK-SP-7 SF (stainless pipe + polypropylene float)
Order Here
IS-DHK-SS
Stainless. No liquid pipe. Fits in 3/4″ bung
$991
Options
Relay Output
A relay output for signals sent to an approved I.S. barrier. 80mA max. 10ft cable is standard.
[IS-RLY] $54
Additional Replacement Battery
This is the only battery that is certified for use with GIZMO I.S. alarms. One is included with the purchase of each tank alarm.
[BT-IS] $48
Extra cable
Extra cable length over the standard length of 10 feet that’s included. Heavy 0.032″ jacket for superior durability. Four stranded conductors x 24 gage.
[C4] $1.28/ft