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 98dB @ 2 ft. (like a smoke alarm)
- Class 1, Div. 1. Gas groups C and/or D. 60079-0 and 60079-11.
- 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. Where possible, the float switch is protected inside a float guard so it can be moved from drum-to-drum without worrying about damage. The enclosure is waterproof to IP65.
BATTERY POWER
Battery Power is uninterruptible and allows installation anywhere. No outlets, electricians, or inspectors needed. The batteries are designed to last for many 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
There are models with a liquid feed pipe, (IS-DHP) or without a liquid feed pipe. (IS-DHK) Since the IS-DHK models have no liquid feed pipe, they are able to fit into a 3/4″NPT drum bung.
In addition to feed pipe choice, there are different materials to choose from. To help with selection, here is a link to chemical compatibility charts and a more detailed page of float switch information
316 Stainless Steel pipe and float. (model IS-DHK-SS) Standard mount is a stainless “collar” with phenolic knob. Note: The diameter of the SS float is too large to surround the float with a float guard as we do with other float switches.
316 Stainless steel pipe with BUNA float switch. (IS-DHK-SB) In this case the float switch is protected with a Stainless steel float guard. Standard mount is a stainless “collar” with phenolic knob. To help select, see this post on choosing a float switch To summarize, BUNA rubber is compatible with most oils, aliphatic hydrocarbons and fuels. chemical compatibility chart here
Polypropylene pipe and float switch. (IS-DHK-PP) The float switch is protected with a float guard.
- Enclosure material………………………….. Aluminum
- Buzzer volume…………………………………98dB @ 2ft.
- Battery capacity………………………………. 2400 mA-hr
- Operating temp (ambient)………………. -40 to 60ºC (-76-140ºF)
- Maximum temp. (liquid)…………………..149ºC [300ºF]
- Ingress protection……………………………. IP65
- Lens material……………………………………Lexan
- Stainless steel…………………………………..316 except retaining rings are type PH 15-7 Mo
- Current consumption during alarm…..30mA
- Relay current…………………………………….80mA max.
- Battery chemistry……………………………..Lithium Thionyl Chloride
- Battery pack voltage…………………………7.2VDC
- Lithium weight…………………………………1.2g (per pack of 2 cells)
- Cable capacitance (if applicable)………30pf/ft
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 SWITCHES
- Float S.G (stainless)………………………….0.75
- Float S.G. (BUNA)……………………………..0.60
- Float S.G (PP)…………………………………..0.60
A comparison of our different float switches can be found on this page.
On this page is a discussion on how to choose the right float switch.
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
No liquid pipe. Fits in 3/4″ bung
From $939
IS-DHP
Includes liquid feed pipe. Fits in 2″ bung.
From $735
Options
Replacement Battery
Each drumalarm includes a battery with purchase. This is an additional battery. This is the only battery that may be used with GIZMO I.S. alarms
[BT-IS] $45
Relay Output
A relay output for signals sent to an approved I.S. barrier. 80mA max. 10ft cable is standard.
[IS-RLY] $54
Extra cable
Extra cable length over the standard length of 10 feet. Heavy 0.032″ jacket for superior durability. Four stranded conductors x 24 gage.
[C-4] $0.80/ft